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| author | Hilko Bengen <bengen@debian.org> | 2014-06-07 12:02:12 +0200 |
|---|---|---|
| committer | Hilko Bengen <bengen@debian.org> | 2014-06-07 12:02:12 +0200 |
| commit | d5ed89b946297270ec28abf44bef2371a06f1f4f (patch) | |
| tree | ce2d945e4dde69af90bd9905a70d8d27f4936776 /docs/reference | |
| download | elasticsearch-d5ed89b946297270ec28abf44bef2371a06f1f4f.tar.gz | |
Imported Upstream version 1.0.3upstream/1.0.3
Diffstat (limited to 'docs/reference')
334 files changed, 28900 insertions, 0 deletions
diff --git a/docs/reference/analysis.asciidoc b/docs/reference/analysis.asciidoc new file mode 100644 index 0000000..7009ca3 --- /dev/null +++ b/docs/reference/analysis.asciidoc @@ -0,0 +1,77 @@ +[[analysis]] += Analysis + +[partintro] +-- +The index analysis module acts as a configurable registry of Analyzers +that can be used in order to both break indexed (analyzed) fields when a +document is indexed and process query strings. It maps to the Lucene +`Analyzer`. + + +Analyzers are composed of a single <<analysis-tokenizers,Tokenizer>> +and zero or more <<analysis-tokenfilters,TokenFilters>>. The tokenizer may +be preceded by one or more <<analysis-charfilters,CharFilters>>. The +analysis module allows one to register `TokenFilters`, `Tokenizers` and +`Analyzers` under logical names that can then be referenced either in +mapping definitions or in certain APIs. The Analysis module +automatically registers (*if not explicitly defined*) built in +analyzers, token filters, and tokenizers. + +Here is a sample configuration: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + standard : + type : standard + stopwords : [stop1, stop2] + myAnalyzer1 : + type : standard + stopwords : [stop1, stop2, stop3] + max_token_length : 500 + # configure a custom analyzer which is + # exactly like the default standard analyzer + myAnalyzer2 : + tokenizer : standard + filter : [standard, lowercase, stop] + tokenizer : + myTokenizer1 : + type : standard + max_token_length : 900 + myTokenizer2 : + type : keyword + buffer_size : 512 + filter : + myTokenFilter1 : + type : stop + stopwords : [stop1, stop2, stop3, stop4] + myTokenFilter2 : + type : length + min : 0 + max : 2000 +-------------------------------------------------- + +[float] +[[backwards-compatibility]] +=== Backwards compatibility + +All analyzers, tokenizers, and token filters can be configured with a +`version` parameter to control which Lucene version behavior they should +use. Possible values are: `3.0` - `3.6`, `4.0` - `4.3` (the highest +version number is the default option). + +-- + +include::analysis/analyzers.asciidoc[] + +include::analysis/tokenizers.asciidoc[] + +include::analysis/tokenfilters.asciidoc[] + +include::analysis/charfilters.asciidoc[] + +include::analysis/icu-plugin.asciidoc[] + diff --git a/docs/reference/analysis/analyzers.asciidoc b/docs/reference/analysis/analyzers.asciidoc new file mode 100644 index 0000000..b97231b --- /dev/null +++ b/docs/reference/analysis/analyzers.asciidoc @@ -0,0 +1,71 @@ +[[analysis-analyzers]] +== Analyzers + +Analyzers are composed of a single <<analysis-tokenizers,Tokenizer>> +and zero or more <<analysis-tokenfilters,TokenFilters>>. The tokenizer may +be preceded by one or more <<analysis-charfilters,CharFilters>>. +The analysis module allows you to register `Analyzers` under logical +names which can then be referenced either in mapping definitions or in +certain APIs. + +Elasticsearch comes with a number of prebuilt analyzers which are +ready to use. Alternatively, you can combine the built in +character filters, tokenizers and token filters to create +<<analysis-custom-analyzer,custom analyzers>>. + +[float] +[[default-analyzers]] +=== Default Analyzers + +An analyzer is registered under a logical name. It can then be +referenced from mapping definitions or certain APIs. When none are +defined, defaults are used. There is an option to define which analyzers +will be used by default when none can be derived. + +The `default` logical name allows one to configure an analyzer that will +be used both for indexing and for searching APIs. The `default_index` +logical name can be used to configure a default analyzer that will be +used just when indexing, and the `default_search` can be used to +configure a default analyzer that will be used just when searching. + +[float] +[[aliasing-analyzers]] +=== Aliasing Analyzers + +Analyzers can be aliased to have several registered lookup names +associated with them. For example, the following will allow +the `standard` analyzer to also be referenced with `alias1` +and `alias2` values. + + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + standard : + alias: [alias1, alias2] + type : standard + stopwords : [test1, test2, test3] +-------------------------------------------------- + +Below is a list of the built in analyzers. + +include::analyzers/standard-analyzer.asciidoc[] + +include::analyzers/simple-analyzer.asciidoc[] + +include::analyzers/whitespace-analyzer.asciidoc[] + +include::analyzers/stop-analyzer.asciidoc[] + +include::analyzers/keyword-analyzer.asciidoc[] + +include::analyzers/pattern-analyzer.asciidoc[] + +include::analyzers/lang-analyzer.asciidoc[] + +include::analyzers/snowball-analyzer.asciidoc[] + +include::analyzers/custom-analyzer.asciidoc[] + diff --git a/docs/reference/analysis/analyzers/custom-analyzer.asciidoc b/docs/reference/analysis/analyzers/custom-analyzer.asciidoc new file mode 100644 index 0000000..5c778a6 --- /dev/null +++ b/docs/reference/analysis/analyzers/custom-analyzer.asciidoc @@ -0,0 +1,52 @@ +[[analysis-custom-analyzer]] +=== Custom Analyzer + +An analyzer of type `custom` that allows to combine a `Tokenizer` with +zero or more `Token Filters`, and zero or more `Char Filters`. The +custom analyzer accepts a logical/registered name of the tokenizer to +use, and a list of logical/registered names of token filters. + +The following are settings that can be set for a `custom` analyzer type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`tokenizer` |The logical / registered name of the tokenizer to use. + +|`filter` |An optional list of logical / registered name of token +filters. + +|`char_filter` |An optional list of logical / registered name of char +filters. +|======================================================================= + +Here is an example: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + myAnalyzer2 : + type : custom + tokenizer : myTokenizer1 + filter : [myTokenFilter1, myTokenFilter2] + char_filter : [my_html] + tokenizer : + myTokenizer1 : + type : standard + max_token_length : 900 + filter : + myTokenFilter1 : + type : stop + stopwords : [stop1, stop2, stop3, stop4] + myTokenFilter2 : + type : length + min : 0 + max : 2000 + char_filter : + my_html : + type : html_strip + escaped_tags : [xxx, yyy] + read_ahead : 1024 +-------------------------------------------------- diff --git a/docs/reference/analysis/analyzers/keyword-analyzer.asciidoc b/docs/reference/analysis/analyzers/keyword-analyzer.asciidoc new file mode 100644 index 0000000..7704895 --- /dev/null +++ b/docs/reference/analysis/analyzers/keyword-analyzer.asciidoc @@ -0,0 +1,7 @@ +[[analysis-keyword-analyzer]] +=== Keyword Analyzer + +An analyzer of type `keyword` that "tokenizes" an entire stream as a +single token. This is useful for data like zip codes, ids and so on. +Note, when using mapping definitions, it might make more sense to simply +mark the field as `not_analyzed`. diff --git a/docs/reference/analysis/analyzers/lang-analyzer.asciidoc b/docs/reference/analysis/analyzers/lang-analyzer.asciidoc new file mode 100644 index 0000000..f963e4b --- /dev/null +++ b/docs/reference/analysis/analyzers/lang-analyzer.asciidoc @@ -0,0 +1,21 @@ +[[analysis-lang-analyzer]] +=== Language Analyzers + +A set of analyzers aimed at analyzing specific language text. The +following types are supported: `arabic`, `armenian`, `basque`, +`brazilian`, `bulgarian`, `catalan`, `chinese`, `cjk`, `czech`, +`danish`, `dutch`, `english`, `finnish`, `french`, `galician`, `german`, +`greek`, `hindi`, `hungarian`, `indonesian`, `italian`, `norwegian`, +`persian`, `portuguese`, `romanian`, `russian`, `spanish`, `swedish`, +`turkish`, `thai`. + +All analyzers support setting custom `stopwords` either internally in +the config, or by using an external stopwords file by setting +`stopwords_path`. Check <<analysis-stop-analyzer,Stop Analyzer>> for +more details. + +The following analyzers support setting custom `stem_exclusion` list: +`arabic`, `armenian`, `basque`, `brazilian`, `bulgarian`, `catalan`, +`czech`, `danish`, `dutch`, `english`, `finnish`, `french`, `galician`, +`german`, `hindi`, `hungarian`, `indonesian`, `italian`, `norwegian`, +`portuguese`, `romanian`, `russian`, `spanish`, `swedish`, `turkish`. diff --git a/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc b/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc new file mode 100644 index 0000000..424ecfa --- /dev/null +++ b/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc @@ -0,0 +1,130 @@ +[[analysis-pattern-analyzer]] +=== Pattern Analyzer + +An analyzer of type `pattern` that can flexibly separate text into terms +via a regular expression. Accepts the following settings: + +The following are settings that can be set for a `pattern` analyzer +type: + +[cols="<,<",options="header",] +|=================================================================== +|Setting |Description +|`lowercase` |Should terms be lowercased or not. Defaults to `true`. +|`pattern` |The regular expression pattern, defaults to `\W+`. +|`flags` |The regular expression flags. +|`stopwords` |A list of stopwords to initialize the stop filter with. +Defaults to an 'empty' stopword list added[1.0.0.RC1, Previously +defaulted to the English stopwords list]. Check +<<analysis-stop-analyzer,Stop Analyzer>> for more details. +|=================================================================== + +*IMPORTANT*: The regular expression should match the *token separators*, +not the tokens themselves. + +Flags should be pipe-separated, eg `"CASE_INSENSITIVE|COMMENTS"`. Check +http://download.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html#field_summary[Java +Pattern API] for more details about `flags` options. + +[float] +==== Pattern Analyzer Examples + +In order to try out these examples, you should delete the `test` index +before running each example: + +[source,js] +-------------------------------------------------- + curl -XDELETE localhost:9200/test +-------------------------------------------------- + +[float] +===== Whitespace tokenizer + +[source,js] +-------------------------------------------------- + curl -XPUT 'localhost:9200/test' -d ' + { + "settings":{ + "analysis": { + "analyzer": { + "whitespace":{ + "type": "pattern", + "pattern":"\\\\s+" + } + } + } + } + }' + + curl 'localhost:9200/test/_analyze?pretty=1&analyzer=whitespace' -d 'foo,bar baz' + # "foo,bar", "baz" +-------------------------------------------------- + +[float] +===== Non-word character tokenizer + +[source,js] +-------------------------------------------------- + + curl -XPUT 'localhost:9200/test' -d ' + { + "settings":{ + "analysis": { + "analyzer": { + "nonword":{ + "type": "pattern", + "pattern":"[^\\\\w]+" + } + } + } + } + }' + + curl 'localhost:9200/test/_analyze?pretty=1&analyzer=nonword' -d 'foo,bar baz' + # "foo,bar baz" becomes "foo", "bar", "baz" + + curl 'localhost:9200/test/_analyze?pretty=1&analyzer=nonword' -d 'type_1-type_4' + # "type_1","type_4" +-------------------------------------------------- + +[float] +===== CamelCase tokenizer + +[source,js] +-------------------------------------------------- + + curl -XPUT 'localhost:9200/test?pretty=1' -d ' + { + "settings":{ + "analysis": { + "analyzer": { + "camel":{ + "type": "pattern", + "pattern":"([^\\\\p{L}\\\\d]+)|(?<=\\\\D)(?=\\\\d)|(?<=\\\\d)(?=\\\\D)|(?<=[\\\\p{L}&&[^\\\\p{Lu}]])(?=\\\\p{Lu})|(?<=\\\\p{Lu})(?=\\\\p{Lu}[\\\\p{L}&&[^\\\\p{Lu}]])" + } + } + } + } + }' + + curl 'localhost:9200/test/_analyze?pretty=1&analyzer=camel' -d ' + MooseX::FTPClass2_beta + ' + # "moose","x","ftp","class","2","beta" +-------------------------------------------------- + +The regex above is easier to understand as: + +[source,js] +-------------------------------------------------- + + ([^\\p{L}\\d]+) # swallow non letters and numbers, + | (?<=\\D)(?=\\d) # or non-number followed by number, + | (?<=\\d)(?=\\D) # or number followed by non-number, + | (?<=[ \\p{L} && [^\\p{Lu}]]) # or lower case + (?=\\p{Lu}) # followed by upper case, + | (?<=\\p{Lu}) # or upper case + (?=\\p{Lu} # followed by upper case + [\\p{L}&&[^\\p{Lu}]] # then lower case + ) +-------------------------------------------------- diff --git a/docs/reference/analysis/analyzers/simple-analyzer.asciidoc b/docs/reference/analysis/analyzers/simple-analyzer.asciidoc new file mode 100644 index 0000000..9d7a7c3 --- /dev/null +++ b/docs/reference/analysis/analyzers/simple-analyzer.asciidoc @@ -0,0 +1,6 @@ +[[analysis-simple-analyzer]] +=== Simple Analyzer + +An analyzer of type `simple` that is built using a +<<analysis-lowercase-tokenizer,Lower +Case Tokenizer>>. diff --git a/docs/reference/analysis/analyzers/snowball-analyzer.asciidoc b/docs/reference/analysis/analyzers/snowball-analyzer.asciidoc new file mode 100644 index 0000000..64804fc --- /dev/null +++ b/docs/reference/analysis/analyzers/snowball-analyzer.asciidoc @@ -0,0 +1,64 @@ +[[analysis-snowball-analyzer]] +=== Snowball Analyzer + +An analyzer of type `snowball` that uses the +<<analysis-standard-tokenizer,standard +tokenizer>>, with +<<analysis-standard-tokenfilter,standard +filter>>, +<<analysis-lowercase-tokenfilter,lowercase +filter>>, +<<analysis-stop-tokenfilter,stop +filter>>, and +<<analysis-snowball-tokenfilter,snowball +filter>>. + +The Snowball Analyzer is a stemming analyzer from Lucene that is +originally based on the snowball project from +http://snowball.tartarus.org[snowball.tartarus.org]. + +Sample usage: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "my_analyzer" : { + "type" : "snowball", + "language" : "English" + } + } + } + } +} +-------------------------------------------------- + +The `language` parameter can have the same values as the +<<analysis-snowball-tokenfilter,snowball +filter>> and defaults to `English`. Note that not all the language +analyzers have a default set of stopwords provided. + +The `stopwords` parameter can be used to provide stopwords for the +languages that have no defaults, or to simply replace the default set +with your custom list. Check <<analysis-stop-analyzer,Stop Analyzer>> +for more details. A default set of stopwords for many of these +languages is available from for instance +https://github.com/apache/lucene-solr/tree/trunk/lucene/analysis/common/src/resources/org/apache/lucene/analysis/[here] +and +https://github.com/apache/lucene-solr/tree/trunk/lucene/analysis/common/src/resources/org/apache/lucene/analysis/snowball[here.] + +A sample configuration (in YAML format) specifying Swedish with +stopwords: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + my_analyzer: + type: snowball + language: Swedish + stopwords: "och,det,att,i,en,jag,hon,som,han,på,den,med,var,sig,för,så,till,är,men,ett,om,hade,de,av,icke,mig,du,henne,då,sin,nu,har,inte,hans,honom,skulle,hennes,där,min,man,ej,vid,kunde,något,från,ut,när,efter,upp,vi,dem,vara,vad,över,än,dig,kan,sina,här,ha,mot,alla,under,någon,allt,mycket,sedan,ju,denna,själv,detta,åt,utan,varit,hur,ingen,mitt,ni,bli,blev,oss,din,dessa,några,deras,blir,mina,samma,vilken,er,sådan,vår,blivit,dess,inom,mellan,sådant,varför,varje,vilka,ditt,vem,vilket,sitta,sådana,vart,dina,vars,vårt,våra,ert,era,vilkas" +-------------------------------------------------- diff --git a/docs/reference/analysis/analyzers/standard-analyzer.asciidoc b/docs/reference/analysis/analyzers/standard-analyzer.asciidoc new file mode 100644 index 0000000..4aae94a --- /dev/null +++ b/docs/reference/analysis/analyzers/standard-analyzer.asciidoc @@ -0,0 +1,27 @@ +[[analysis-standard-analyzer]] +=== Standard Analyzer + +An analyzer of type `standard` is built using the +<<analysis-standard-tokenizer,Standard +Tokenizer>> with the +<<analysis-standard-tokenfilter,Standard +Token Filter>>, +<<analysis-lowercase-tokenfilter,Lower +Case Token Filter>>, and +<<analysis-stop-tokenfilter,Stop +Token Filter>>. + +The following are settings that can be set for a `standard` analyzer +type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`stopwords` |A list of stopwords to initialize the stop filter with. +Defaults to an 'empty' stopword list added[1.0.0.Beta1, Previously +defaulted to the English stopwords list]. Check +<<analysis-stop-analyzer,Stop Analyzer>> for more details. +|`max_token_length` |The maximum token length. If a token is seen that +exceeds this length then it is discarded. Defaults to `255`. +|======================================================================= + diff --git a/docs/reference/analysis/analyzers/stop-analyzer.asciidoc b/docs/reference/analysis/analyzers/stop-analyzer.asciidoc new file mode 100644 index 0000000..9a19772 --- /dev/null +++ b/docs/reference/analysis/analyzers/stop-analyzer.asciidoc @@ -0,0 +1,22 @@ +[[analysis-stop-analyzer]] +=== Stop Analyzer + +An analyzer of type `stop` that is built using a +<<analysis-lowercase-tokenizer,Lower +Case Tokenizer>>, with +<<analysis-stop-tokenfilter,Stop +Token Filter>>. + +The following are settings that can be set for a `stop` analyzer type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`stopwords` |A list of stopwords to initialize the stop filter with. +Defaults to the english stop words. +|`stopwords_path` |A path (either relative to `config` location, or +absolute) to a stopwords file configuration. +|======================================================================= + +Use `stopwords: _none_` to explicitly specify an 'empty' stopword list. + diff --git a/docs/reference/analysis/analyzers/whitespace-analyzer.asciidoc b/docs/reference/analysis/analyzers/whitespace-analyzer.asciidoc new file mode 100644 index 0000000..2095686 --- /dev/null +++ b/docs/reference/analysis/analyzers/whitespace-analyzer.asciidoc @@ -0,0 +1,6 @@ +[[analysis-whitespace-analyzer]] +=== Whitespace Analyzer + +An analyzer of type `whitespace` that is built using a +<<analysis-whitespace-tokenizer,Whitespace +Tokenizer>>. diff --git a/docs/reference/analysis/charfilters.asciidoc b/docs/reference/analysis/charfilters.asciidoc new file mode 100644 index 0000000..a40cfff --- /dev/null +++ b/docs/reference/analysis/charfilters.asciidoc @@ -0,0 +1,16 @@ +[[analysis-charfilters]] +== Character Filters + +Character filters are used to preprocess the string of +characters before it is passed to the <<analysis-tokenizers,tokenizer>>. +A character filter may be used to strip out HTML markup, , or to convert +`"&"` characters to the word `"and"`. + +Elasticsearch has built in characters filters which can be +used to build <<analysis-custom-analyzer,custom analyzers>>. + +include::charfilters/mapping-charfilter.asciidoc[] + +include::charfilters/htmlstrip-charfilter.asciidoc[] + +include::charfilters/pattern-replace-charfilter.asciidoc[] diff --git a/docs/reference/analysis/charfilters/htmlstrip-charfilter.asciidoc b/docs/reference/analysis/charfilters/htmlstrip-charfilter.asciidoc new file mode 100644 index 0000000..f12238a --- /dev/null +++ b/docs/reference/analysis/charfilters/htmlstrip-charfilter.asciidoc @@ -0,0 +1,5 @@ +[[analysis-htmlstrip-charfilter]] +=== HTML Strip Char Filter + +A char filter of type `html_strip` stripping out HTML elements from an +analyzed text. diff --git a/docs/reference/analysis/charfilters/mapping-charfilter.asciidoc b/docs/reference/analysis/charfilters/mapping-charfilter.asciidoc new file mode 100644 index 0000000..ef4df81 --- /dev/null +++ b/docs/reference/analysis/charfilters/mapping-charfilter.asciidoc @@ -0,0 +1,38 @@ +[[analysis-mapping-charfilter]] +=== Mapping Char Filter + +A char filter of type `mapping` replacing characters of an analyzed text +with given mapping. + +Here is a sample configuration: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "char_filter" : { + "my_mapping" : { + "type" : "mapping", + "mappings" : ["ph=>f", "qu=>q"] + } + }, + "analyzer" : { + "custom_with_char_filter" : { + "tokenizer" : "standard", + "char_filter" : ["my_mapping"] + }, + } + } + } +} +-------------------------------------------------- + +Otherwise the setting `mappings_path` can specify a file where you can +put the list of char mapping : + +[source,js] +-------------------------------------------------- +ph => f +qu => k +-------------------------------------------------- diff --git a/docs/reference/analysis/charfilters/pattern-replace-charfilter.asciidoc b/docs/reference/analysis/charfilters/pattern-replace-charfilter.asciidoc new file mode 100644 index 0000000..5a0cf28 --- /dev/null +++ b/docs/reference/analysis/charfilters/pattern-replace-charfilter.asciidoc @@ -0,0 +1,37 @@ +[[analysis-pattern-replace-charfilter]] +=== Pattern Replace Char Filter + +The `pattern_replace` char filter allows the use of a regex to +manipulate the characters in a string before analysis. The regular +expression is defined using the `pattern` parameter, and the replacement +string can be provided using the `replacement` parameter (supporting +referencing the original text, as explained +http://docs.oracle.com/javase/6/docs/api/java/util/regex/Matcher.html#appendReplacement(java.lang.StringBuffer,%20java.lang.String)[here]). +For more information check the +http://lucene.apache.org/core/4_3_1/analyzers-common/org/apache/lucene/analysis/pattern/PatternReplaceCharFilter.html[lucene +documentation] + +Here is a sample configuration: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "char_filter" : { + "my_pattern":{ + "type":"pattern_replace", + "pattern":"sample(.*)", + "replacement":"replacedSample $1" + } + }, + "analyzer" : { + "custom_with_char_filter" : { + "tokenizer" : "standard", + "char_filter" : ["my_pattern"] + }, + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/analysis/icu-plugin.asciidoc b/docs/reference/analysis/icu-plugin.asciidoc new file mode 100644 index 0000000..c1be216 --- /dev/null +++ b/docs/reference/analysis/icu-plugin.asciidoc @@ -0,0 +1,220 @@ +[[analysis-icu-plugin]] +== ICU Analysis Plugin + +The http://icu-project.org/[ICU] analysis plugin allows for unicode +normalization, collation and folding. The plugin is called +https://github.com/elasticsearch/elasticsearch-analysis-icu[elasticsearch-analysis-icu]. + +The plugin includes the following analysis components: + +[float] +[[icu-normalization]] +=== ICU Normalization + +Normalizes characters as explained +http://userguide.icu-project.org/transforms/normalization[here]. It +registers itself by default under `icu_normalizer` or `icuNormalizer` +using the default settings. Allows for the name parameter to be provided +which can include the following values: `nfc`, `nfkc`, and `nfkc_cf`. +Here is a sample settings: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "normalization" : { + "tokenizer" : "keyword", + "filter" : ["icu_normalizer"] + } + } + } + } +} +-------------------------------------------------- + +[float] +[[icu-folding]] +=== ICU Folding + +Folding of unicode characters based on `UTR#30`. It registers itself +under `icu_folding` and `icuFolding` names. +The filter also does lowercasing, which means the lowercase filter can +normally be left out. Sample setting: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "folding" : { + "tokenizer" : "keyword", + "filter" : ["icu_folding"] + } + } + } + } +} +-------------------------------------------------- + +[float] +[[icu-filtering]] +==== Filtering + +The folding can be filtered by a set of unicode characters with the +parameter `unicodeSetFilter`. This is useful for a non-internationalized +search engine where retaining a set of national characters which are +primary letters in a specific language is wanted. See syntax for the +UnicodeSet +http://icu-project.org/apiref/icu4j/com/ibm/icu/text/UnicodeSet.html[here]. + +The Following example exempts Swedish characters from the folding. Note +that the filtered characters are NOT lowercased which is why we add that +filter below. + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "folding" : { + "tokenizer" : "standard", + "filter" : ["my_icu_folding", "lowercase"] + } + } + "filter" : { + "my_icu_folding" : { + "type" : "icu_folding" + "unicodeSetFilter" : "[^åäöÅÄÖ]" + } + } + } + } +} +-------------------------------------------------- + +[float] +[[icu-collation]] +=== ICU Collation + +Uses collation token filter. Allows to either specify the rules for +collation (defined +http://www.icu-project.org/userguide/Collate_Customization.html[here]) +using the `rules` parameter (can point to a location or expressed in the +settings, location can be relative to config location), or using the +`language` parameter (further specialized by country and variant). By +default registers under `icu_collation` or `icuCollation` and uses the +default locale. + +Here is a sample settings: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "collation" : { + "tokenizer" : "keyword", + "filter" : ["icu_collation"] + } + } + } + } +} +-------------------------------------------------- + +And here is a sample of custom collation: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "collation" : { + "tokenizer" : "keyword", + "filter" : ["myCollator"] + } + }, + "filter" : { + "myCollator" : { + "type" : "icu_collation", + "language" : "en" + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Options + +[horizontal] +`strength`:: + The strength property determines the minimum level of difference considered significant during comparison. + The default strength for the Collator is `tertiary`, unless specified otherwise by the locale used to create the Collator. + Possible values: `primary`, `secondary`, `tertiary`, `quaternary` or `identical`. + + + See http://icu-project.org/apiref/icu4j/com/ibm/icu/text/Collator.html[ICU Collation] documentation for a more detailed + explanation for the specific values. + +`decomposition`:: + Possible values: `no` or `canonical`. Defaults to `no`. Setting this decomposition property with + `canonical` allows the Collator to handle un-normalized text properly, producing the same results as if the text were + normalized. If `no` is set, it is the user's responsibility to insure that all text is already in the appropriate form + before a comparison or before getting a CollationKey. Adjusting decomposition mode allows the user to select between + faster and more complete collation behavior. Since a great many of the world's languages do not require text + normalization, most locales set `no` as the default decomposition mode. + +[float] +==== Expert options: + +[horizontal] +`alternate`:: + Possible values: `shifted` or `non-ignorable`. Sets the alternate handling for strength `quaternary` + to be either shifted or non-ignorable. What boils down to ignoring punctuation and whitespace. + +`caseLevel`:: + Possible values: `true` or `false`. Default is `false`. Whether case level sorting is required. When + strength is set to `primary` this will ignore accent differences. + +`caseFirst`:: + Possible values: `lower` or `upper`. Useful to control which case is sorted first when case is not ignored + for strength `tertiary`. + +`numeric`:: + Possible values: `true` or `false`. Whether digits are sorted according to numeric representation. For + example the value `egg-9` is sorted before the value `egg-21`. Defaults to `false`. + +`variableTop`:: + Single character or contraction. Controls what is variable for `alternate`. + +`hiraganaQuaternaryMode`:: + Possible values: `true` or `false`. Defaults to `false`. Distinguishing between Katakana and + Hiragana characters in `quaternary` strength . + +[float] +=== ICU Tokenizer + +Breaks text into words according to UAX #29: Unicode Text Segmentation ((http://www.unicode.org/reports/tr29/)). + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "collation" : { + "tokenizer" : "icu_tokenizer", + } + } + } + } +} +-------------------------------------------------- + diff --git a/docs/reference/analysis/tokenfilters.asciidoc b/docs/reference/analysis/tokenfilters.asciidoc new file mode 100644 index 0000000..ad72fb7 --- /dev/null +++ b/docs/reference/analysis/tokenfilters.asciidoc @@ -0,0 +1,74 @@ +[[analysis-tokenfilters]] +== Token Filters + +Token filters accept a stream of tokens from a +<<analysis-tokenizers,tokenizer>> and can modify tokens +(eg lowercasing), delete tokens (eg remove stopwords) +or add tokens (eg synonyms). + +Elasticsearch has a number of built in token filters which can be +used to build <<analysis-custom-analyzer,custom analyzers>>. + +include::tokenfilters/standard-tokenfilter.asciidoc[] + +include::tokenfilters/asciifolding-tokenfilter.asciidoc[] + +include::tokenfilters/length-tokenfilter.asciidoc[] + +include::tokenfilters/lowercase-tokenfilter.asciidoc[] + +include::tokenfilters/ngram-tokenfilter.asciidoc[] + +include::tokenfilters/edgengram-tokenfilter.asciidoc[] + +include::tokenfilters/porterstem-tokenfilter.asciidoc[] + +include::tokenfilters/shingle-tokenfilter.asciidoc[] + +include::tokenfilters/stop-tokenfilter.asciidoc[] + +include::tokenfilters/word-delimiter-tokenfilter.asciidoc[] + +include::tokenfilters/stemmer-tokenfilter.asciidoc[] + +include::tokenfilters/stemmer-override-tokenfilter.asciidoc[] + +include::tokenfilters/keyword-marker-tokenfilter.asciidoc[] + +include::tokenfilters/keyword-repeat-tokenfilter.asciidoc[] + +include::tokenfilters/kstem-tokenfilter.asciidoc[] + +include::tokenfilters/snowball-tokenfilter.asciidoc[] + +include::tokenfilters/phonetic-tokenfilter.asciidoc[] + +include::tokenfilters/synonym-tokenfilter.asciidoc[] + +include::tokenfilters/compound-word-tokenfilter.asciidoc[] + +include::tokenfilters/reverse-tokenfilter.asciidoc[] + +include::tokenfilters/elision-tokenfilter.asciidoc[] + +include::tokenfilters/truncate-tokenfilter.asciidoc[] + +include::tokenfilters/unique-tokenfilter.asciidoc[] + +include::tokenfilters/pattern-capture-tokenfilter.asciidoc[] + +include::tokenfilters/pattern_replace-tokenfilter.asciidoc[] + +include::tokenfilters/trim-tokenfilter.asciidoc[] + +include::tokenfilters/limit-token-count-tokenfilter.asciidoc[] + +include::tokenfilters/hunspell-tokenfilter.asciidoc[] + +include::tokenfilters/common-grams-tokenfilter.asciidoc[] + +include::tokenfilters/normalization-tokenfilter.asciidoc[] + +include::tokenfilters/delimited-payload-tokenfilter.asciidoc[] + +include::tokenfilters/keep-words-tokenfilter.asciidoc[] diff --git a/docs/reference/analysis/tokenfilters/asciifolding-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/asciifolding-tokenfilter.asciidoc new file mode 100644 index 0000000..aaca0eb --- /dev/null +++ b/docs/reference/analysis/tokenfilters/asciifolding-tokenfilter.asciidoc @@ -0,0 +1,7 @@ +[[analysis-asciifolding-tokenfilter]] +=== ASCII Folding Token Filter + +A token filter of type `asciifolding` that converts alphabetic, numeric, +and symbolic Unicode characters which are not in the first 127 ASCII +characters (the "Basic Latin" Unicode block) into their ASCII +equivalents, if one exists. diff --git a/docs/reference/analysis/tokenfilters/common-grams-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/common-grams-tokenfilter.asciidoc new file mode 100644 index 0000000..f0659e0 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/common-grams-tokenfilter.asciidoc @@ -0,0 +1,61 @@ +[[analysis-common-grams-tokenfilter]] +=== Common Grams Token Filter + +Token filter that generates bigrams for frequently occuring terms. +Single terms are still indexed. It can be used as an alternative to the +<<analysis-stop-tokenfilter,Stop +Token Filter>> when we don't want to completely ignore common terms. + +For example, the text "the quick brown is a fox" will be tokenized as +"the", "the_quick", "quick", "brown", "brown_is", "is_a", "a_fox", +"fox". Assuming "the", "is" and "a" are common words. + +When `query_mode` is enabled, the token filter removes common words and +single terms followed by a common word. This parameter should be enabled +in the search analyzer. + +For example, the query "the quick brown is a fox" will be tokenized as +"the_quick", "quick", "brown_is", "is_a", "a_fox", "fox". + +The following are settings that can be set: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`common_words` |A list of common words to use. + +|`common_words_path` |A path (either relative to `config` location, or +absolute) to a list of common words. Each word should be in its own +"line" (separated by a line break). The file must be UTF-8 encoded. + +|`ignore_case` |If true, common words matching will be case insensitive +(defaults to `false`). + +|`query_mode` |Generates bigrams then removes common words and single +terms followed by a common word (defaults to `false`). +|======================================================================= + +Note, `common_words` or `common_words_path` field is required. + +Here is an example: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + index_grams : + tokenizer : whitespace + filter : [common_grams] + search_grams : + tokenizer : whitespace + filter : [common_grams_query] + filter : + common_grams : + type : common_grams + common_words: [a, an, the] + common_grams_query : + type : common_grams + query_mode: true + common_words: [a, an, the] +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/compound-word-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/compound-word-tokenfilter.asciidoc new file mode 100644 index 0000000..6719a9c --- /dev/null +++ b/docs/reference/analysis/tokenfilters/compound-word-tokenfilter.asciidoc @@ -0,0 +1,48 @@ +[[analysis-compound-word-tokenfilter]] +=== Compound Word Token Filter + +Token filters that allow to decompose compound words. There are two +types available: `dictionary_decompounder` and +`hyphenation_decompounder`. + +The following are settings that can be set for a compound word token +filter type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`word_list` |A list of words to use. + +|`word_list_path` |A path (either relative to `config` location, or +absolute) to a list of words. + +|`min_word_size` |Minimum word size(Integer). Defaults to 5. + +|`min_subword_size` |Minimum subword size(Integer). Defaults to 2. + +|`max_subword_size` |Maximum subword size(Integer). Defaults to 15. + +|`only_longest_match` |Only matching the longest(Boolean). Defaults to +`false` +|======================================================================= + +Here is an example: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + myAnalyzer2 : + type : custom + tokenizer : standard + filter : [myTokenFilter1, myTokenFilter2] + filter : + myTokenFilter1 : + type : dictionary_decompounder + word_list: [one, two, three] + myTokenFilter2 : + type : hyphenation_decompounder + word_list_path: path/to/words.txt + max_subword_size : 22 +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/delimited-payload-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/delimited-payload-tokenfilter.asciidoc new file mode 100644 index 0000000..293b51a --- /dev/null +++ b/docs/reference/analysis/tokenfilters/delimited-payload-tokenfilter.asciidoc @@ -0,0 +1,16 @@ +[[analysis-delimited-payload-tokenfilter]] +=== Delimited Payload Token Filter + +Named `delimited_payload_filter`. Splits tokens into tokens and payload whenever a delimiter character is found. + +Example: "the|1 quick|2 fox|3" is split per default int to tokens `fox`, `quick` and `the` with payloads `1`, `2` and `3` respectively. + + + +Parameters: + +`delimiter`:: + Character used for splitting the tokens. Default is `|`. + +`encoding`:: + The type of the payload. `int` for integer, `float` for float and `identity` for characters. Default is `float`.
\ No newline at end of file diff --git a/docs/reference/analysis/tokenfilters/edgengram-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/edgengram-tokenfilter.asciidoc new file mode 100644 index 0000000..3ba0ede --- /dev/null +++ b/docs/reference/analysis/tokenfilters/edgengram-tokenfilter.asciidoc @@ -0,0 +1,16 @@ +[[analysis-edgengram-tokenfilter]] +=== Edge NGram Token Filter + +A token filter of type `edgeNGram`. + +The following are settings that can be set for a `edgeNGram` token +filter type: + +[cols="<,<",options="header",] +|====================================================== +|Setting |Description +|`min_gram` |Defaults to `1`. +|`max_gram` |Defaults to `2`. +|`side` |Either `front` or `back`. Defaults to `front`. +|====================================================== + diff --git a/docs/reference/analysis/tokenfilters/elision-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/elision-tokenfilter.asciidoc new file mode 100644 index 0000000..c44ccff --- /dev/null +++ b/docs/reference/analysis/tokenfilters/elision-tokenfilter.asciidoc @@ -0,0 +1,28 @@ +[[analysis-elision-tokenfilter]] +=== Elision Token Filter + +A token filter which removes elisions. For example, "l'avion" (the +plane) will tokenized as "avion" (plane). + +Accepts `articles` setting which is a set of stop words articles. For +example: + +[source,js] +-------------------------------------------------- +"index" : { + "analysis" : { + "analyzer" : { + "default" : { + "tokenizer" : "standard", + "filter" : ["standard", "elision"] + } + }, + "filter" : { + "elision" : { + "type" : "elision", + "articles" : ["l", "m", "t", "qu", "n", "s", "j"] + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/hunspell-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/hunspell-tokenfilter.asciidoc new file mode 100644 index 0000000..9a235dd --- /dev/null +++ b/docs/reference/analysis/tokenfilters/hunspell-tokenfilter.asciidoc @@ -0,0 +1,115 @@ +[[analysis-hunspell-tokenfilter]] +=== Hunspell Token Filter + +Basic support for hunspell stemming. Hunspell dictionaries will be +picked up from a dedicated hunspell directory on the filesystem +(defaults to `<path.conf>/hunspell`). Each dictionary is expected to +have its own directory named after its associated locale (language). +This dictionary directory is expected to hold both the \*.aff and \*.dic +files (all of which will automatically be picked up). For example, +assuming the default hunspell location is used, the following directory +layout will define the `en_US` dictionary: + +[source,js] +-------------------------------------------------- +- conf + |-- hunspell + | |-- en_US + | | |-- en_US.dic + | | |-- en_US.aff +-------------------------------------------------- + +The location of the hunspell directory can be configured using the +`indices.analysis.hunspell.dictionary.location` settings in +_elasticsearch.yml_. + +Each dictionary can be configured with two settings: + +`ignore_case`:: + If true, dictionary matching will be case insensitive + (defaults to `false`) + +`strict_affix_parsing`:: + Determines whether errors while reading a + affix rules file will cause exception or simple be ignored (defaults to + `true`) + +These settings can be configured globally in `elasticsearch.yml` using + +* `indices.analysis.hunspell.dictionary.ignore_case` and +* `indices.analysis.hunspell.dictionary.strict_affix_parsing` + +or for specific dictionaries: + +* `indices.analysis.hunspell.dictionary.en_US.ignore_case` and +* `indices.analysis.hunspell.dictionary.en_US.strict_affix_parsing`. + +It is also possible to add `settings.yml` file under the dictionary +directory which holds these settings (this will override any other +settings defined in the `elasticsearch.yml`). + +One can use the hunspell stem filter by configuring it the analysis +settings: + +[source,js] +-------------------------------------------------- +{ + "analysis" : { + "analyzer" : { + "en" : { + "tokenizer" : "standard", + "filter" : [ "lowercase", "en_US" ] + } + }, + "filter" : { + "en_US" : { + "type" : "hunspell", + "locale" : "en_US", + "dedup" : true + } + } + } +} +-------------------------------------------------- + +The hunspell token filter accepts four options: + +`locale`:: + A locale for this filter. If this is unset, the `lang` or + `language` are used instead - so one of these has to be set. + +`dictionary`:: + The name of a dictionary. The path to your hunspell + dictionaries should be configured via + `indices.analysis.hunspell.dictionary.location` before. + +`dedup`:: + If only unique terms should be returned, this needs to be + set to `true`. Defaults to `true`. + +`recursion_level`:: + Configures the recursion level a + stemmer can go into. Defaults to `2`. Some languages (for example czech) + give better results when set to `1` or `0`, so you should test it out. + +NOTE: As opposed to the snowball stemmers (which are algorithm based) +this is a dictionary lookup based stemmer and therefore the quality of +the stemming is determined by the quality of the dictionary. + +[float] +==== References + +Hunspell is a spell checker and morphological analyzer designed for +languages with rich morphology and complex word compounding and +character encoding. + +1. Wikipedia, http://en.wikipedia.org/wiki/Hunspell + +2. Source code, http://hunspell.sourceforge.net/ + +3. Open Office Hunspell dictionaries, http://wiki.openoffice.org/wiki/Dictionaries + +4. Mozilla Hunspell dictionaries, https://addons.mozilla.org/en-US/firefox/language-tools/ + +5. Chromium Hunspell dictionaries, + http://src.chromium.org/viewvc/chrome/trunk/deps/third_party/hunspell_dictionaries/ diff --git a/docs/reference/analysis/tokenfilters/keep-words-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/keep-words-tokenfilter.asciidoc new file mode 100644 index 0000000..e4abbef --- /dev/null +++ b/docs/reference/analysis/tokenfilters/keep-words-tokenfilter.asciidoc @@ -0,0 +1,49 @@ +[[analysis-keep-words-tokenfilter]] +=== Keep Words Token Filter + +A token filter of type `keep` that only keeps tokens with text contained in a +predefined set of words. The set of words can be defined in the settings or +loaded from a text file containing one word per line. + + +[float] +=== Options +[horizontal] +keep_words:: a list of words to keep +keep_words_path:: a path to a words file +keep_words_case:: a boolean indicating whether to lower case the words (defaults to `false`) + + + +[float] +=== Settings example + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "my_analyzer" : { + "tokenizer" : "standard", + "filter" : ["standard", "lowercase", "words_till_three"] + }, + "my_analyzer1" : { + "tokenizer" : "standard", + "filter" : ["standard", "lowercase", "words_on_file"] + } + }, + "filter" : { + "words_till_three" : { + "type" : "keep", + "keep_words" : [ "one", "two", "three"] + }, + "words_on_file" : { + "type" : "keep", + "keep_words_path" : "/path/to/word/file" + } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/keyword-marker-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/keyword-marker-tokenfilter.asciidoc new file mode 100644 index 0000000..465bfd5 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/keyword-marker-tokenfilter.asciidoc @@ -0,0 +1,34 @@ +[[analysis-keyword-marker-tokenfilter]] +=== Keyword Marker Token Filter + +Protects words from being modified by stemmers. Must be placed before +any stemming filters. + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`keywords` |A list of words to use. + +|`keywords_path` |A path (either relative to `config` location, or +absolute) to a list of words. + +|`ignore_case` |Set to `true` to lower case all words first. Defaults to +`false`. +|======================================================================= + +Here is an example: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + myAnalyzer : + type : custom + tokenizer : standard + filter : [lowercase, protwods, porter_stem] + filter : + protwods : + type : keyword_marker + keywords_path : analysis/protwords.txt +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/keyword-repeat-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/keyword-repeat-tokenfilter.asciidoc new file mode 100644 index 0000000..fddab34 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/keyword-repeat-tokenfilter.asciidoc @@ -0,0 +1,26 @@ +[[analysis-keyword-repeat-tokenfilter]] +=== Keyword Repeat Token Filter + +The `keyword_repeat` token filter Emits each incoming token twice once +as keyword and once as a non-keyword to allow an un-stemmed version of a +term to be indexed side by site to the stemmed version of the term. +Given the nature of this filter each token that isn't transformed by a +subsequent stemmer will be indexed twice. Therefore, consider adding a +`unique` filter with `only_on_same_position` set to `true` to drop +unnecessary duplicates. + +Here is an example: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + myAnalyzer : + type : custom + tokenizer : standard + filter : [lowercase, keyword_repeat, porter_stem, unique_stem] + unique_stem: + type: unique + only_on_same_position : true +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/kstem-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/kstem-tokenfilter.asciidoc new file mode 100644 index 0000000..ff0695e --- /dev/null +++ b/docs/reference/analysis/tokenfilters/kstem-tokenfilter.asciidoc @@ -0,0 +1,6 @@ +[[analysis-kstem-tokenfilter]] +=== KStem Token Filter + +The `kstem` token filter is a high performance filter for english. All +terms must already be lowercased (use `lowercase` filter) for this +filter to work correctly. diff --git a/docs/reference/analysis/tokenfilters/length-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/length-tokenfilter.asciidoc new file mode 100644 index 0000000..2651980 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/length-tokenfilter.asciidoc @@ -0,0 +1,16 @@ +[[analysis-length-tokenfilter]] +=== Length Token Filter + +A token filter of type `length` that removes words that are too long or +too short for the stream. + +The following are settings that can be set for a `length` token filter +type: + +[cols="<,<",options="header",] +|=========================================================== +|Setting |Description +|`min` |The minimum number. Defaults to `0`. +|`max` |The maximum number. Defaults to `Integer.MAX_VALUE`. +|=========================================================== + diff --git a/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc new file mode 100644 index 0000000..a6598be --- /dev/null +++ b/docs/reference/analysis/tokenfilters/limit-token-count-tokenfilter.asciidoc @@ -0,0 +1,32 @@ +[[analysis-limit-token-count-tokenfilter]] +=== Limit Token Count Token Filter + +Limits the number of tokens that are indexed per document and field. + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`max_token_count` |The maximum number of tokens that should be indexed +per document and field. The default is `1` + +|`consume_all_tokens` |If set to `true` the filter exhaust the stream +even if `max_token_count` tokens have been consumed already. The default +is `false`. +|======================================================================= + +Here is an example: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + myAnalyzer : + type : custom + tokenizer : standard + filter : [lowercase, five_token_limit] + filter : + five_token_limit : + type : limit + max_token_count : 5 +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/lowercase-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/lowercase-tokenfilter.asciidoc new file mode 100644 index 0000000..857c0d7 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/lowercase-tokenfilter.asciidoc @@ -0,0 +1,37 @@ +[[analysis-lowercase-tokenfilter]] +=== Lowercase Token Filter + +A token filter of type `lowercase` that normalizes token text to lower +case. + +Lowercase token filter supports Greek and Turkish lowercase token +filters through the `language` parameter. Below is a usage example in a +custom analyzer + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + myAnalyzer2 : + type : custom + tokenizer : myTokenizer1 + filter : [myTokenFilter1, myGreekLowerCaseFilter] + char_filter : [my_html] + tokenizer : + myTokenizer1 : + type : standard + max_token_length : 900 + filter : + myTokenFilter1 : + type : stop + stopwords : [stop1, stop2, stop3, stop4] + myGreekLowerCaseFilter : + type : lowercase + language : greek + char_filter : + my_html : + type : html_strip + escaped_tags : [xxx, yyy] + read_ahead : 1024 +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/ngram-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/ngram-tokenfilter.asciidoc new file mode 100644 index 0000000..5f91136 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/ngram-tokenfilter.asciidoc @@ -0,0 +1,15 @@ +[[analysis-ngram-tokenfilter]] +=== NGram Token Filter + +A token filter of type `nGram`. + +The following are settings that can be set for a `nGram` token filter +type: + +[cols="<,<",options="header",] +|============================ +|Setting |Description +|`min_gram` |Defaults to `1`. +|`max_gram` |Defaults to `2`. +|============================ + diff --git a/docs/reference/analysis/tokenfilters/normalization-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/normalization-tokenfilter.asciidoc new file mode 100644 index 0000000..8751872 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/normalization-tokenfilter.asciidoc @@ -0,0 +1,15 @@ +[[analysis-normalization-tokenfilter]] +=== Normalization Token Filter + +There are several token filters available which try to normalize special +characters of a certain language. + +You can currently choose between `arabic_normalization` and +`persian_normalization` normalization in your token filter +configuration. For more information check the +http://lucene.apache.org/core/4_3_1/analyzers-common/org/apache/lucene/analysis/ar/ArabicNormalizer.html[ArabicNormalizer] +or the +http://lucene.apache.org/core/4_3_1/analyzers-common/org/apache/lucene/analysis/fa/PersianNormalizer.html[PersianNormalizer] +documentation. + +*Note:* These filters are available since `0.90.2` diff --git a/docs/reference/analysis/tokenfilters/pattern-capture-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/pattern-capture-tokenfilter.asciidoc new file mode 100644 index 0000000..4091296 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/pattern-capture-tokenfilter.asciidoc @@ -0,0 +1,134 @@ +[[analysis-pattern-capture-tokenfilter]] +=== Pattern Capture Token Filter + +The `pattern_capture` token filter, unlike the `pattern` tokenizer, +emits a token for every capture group in the regular expression. +Patterns are not anchored to the beginning and end of the string, so +each pattern can match multiple times, and matches are allowed to +overlap. + +For instance a pattern like : + +[source,js] +-------------------------------------------------- +"(([a-z]+)(\d*))" +-------------------------------------------------- + +when matched against: + +[source,js] +-------------------------------------------------- +"abc123def456" +-------------------------------------------------- + +would produce the tokens: [ `abc123`, `abc`, `123`, `def456`, `def`, +`456` ] + +If `preserve_original` is set to `true` (the default) then it would also +emit the original token: `abc123def456`. + +This is particularly useful for indexing text like camel-case code, eg +`stripHTML` where a user may search for `"strip html"` or `"striphtml"`: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/ -d ' +{ + "settings" : { + "analysis" : { + "filter" : { + "code" : { + "type" : "pattern_capture", + "preserve_original" : 1, + "patterns" : [ + "(\\p{Ll}+|\\p{Lu}\\p{Ll}+|\\p{Lu}+)", + "(\\d+)" + ] + } + }, + "analyzer" : { + "code" : { + "tokenizer" : "pattern", + "filter" : [ "code", "lowercase" ] + } + } + } + } +} +' +-------------------------------------------------- + +When used to analyze the text + +[source,js] +-------------------------------------------------- +import static org.apache.commons.lang.StringEscapeUtils.escapeHtml +-------------------------------------------------- + +this emits the tokens: [ `import`, `static`, `org`, `apache`, `commons`, +`lang`, `stringescapeutils`, `string`, `escape`, `utils`, `escapehtml`, +`escape`, `html` ] + +Another example is analyzing email addresses: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/ -d ' +{ + "settings" : { + "analysis" : { + "filter" : { + "email" : { + "type" : "pattern_capture", + "preserve_original" : 1, + "patterns" : [ + "(\\w+)", + "(\\p{L}+)", + "(\\d+)", + "@(.+)" + ] + } + }, + "analyzer" : { + "email" : { + "tokenizer" : "uax_url_email", + "filter" : [ "email", "lowercase", "unique" ] + } + } + } + } +} +' +-------------------------------------------------- + +When the above analyzer is used on an email address like: + +[source,js] +-------------------------------------------------- +john-smith_123@foo-bar.com +-------------------------------------------------- + +it would produce the following tokens: [ `john-smith_123`, +`foo-bar.com`, `john`, `smith_123`, `smith`, `123`, `foo`, +`foo-bar.com`, `bar`, `com` ] + +Multiple patterns are required to allow overlapping captures, but also +means that patterns are less dense and easier to understand. + +*Note:* All tokens are emitted in the same position, and with the same +character offsets, so when combined with highlighting, the whole +original token will be highlighted, not just the matching subset. For +instance, querying the above email address for `"smith"` would +highlight: + +[source,js] +-------------------------------------------------- + <em>john-smith_123@foo-bar.com</em> +-------------------------------------------------- + +not: + +[source,js] +-------------------------------------------------- + john-<em>smith</em>_123@foo-bar.com +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/pattern_replace-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/pattern_replace-tokenfilter.asciidoc new file mode 100644 index 0000000..54e0842 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/pattern_replace-tokenfilter.asciidoc @@ -0,0 +1,9 @@ +[[analysis-pattern_replace-tokenfilter]] +=== Pattern Replace Token Filter + +The `pattern_replace` token filter allows to easily handle string +replacements based on a regular expression. The regular expression is +defined using the `pattern` parameter, and the replacement string can be +provided using the `replacement` parameter (supporting referencing the +original text, as explained +http://docs.oracle.com/javase/6/docs/api/java/util/regex/Matcher.html#appendReplacement(java.lang.StringBuffer,%20java.lang.String)[here]). diff --git a/docs/reference/analysis/tokenfilters/phonetic-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/phonetic-tokenfilter.asciidoc new file mode 100644 index 0000000..b7e9334 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/phonetic-tokenfilter.asciidoc @@ -0,0 +1,5 @@ +[[analysis-phonetic-tokenfilter]] +=== Phonetic Token Filter + +The `phonetic` token filter is provided as a plugin and located +https://github.com/elasticsearch/elasticsearch-analysis-phonetic[here]. diff --git a/docs/reference/analysis/tokenfilters/porterstem-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/porterstem-tokenfilter.asciidoc new file mode 100644 index 0000000..fc2edf5 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/porterstem-tokenfilter.asciidoc @@ -0,0 +1,15 @@ +[[analysis-porterstem-tokenfilter]] +=== Porter Stem Token Filter + +A token filter of type `porter_stem` that transforms the token stream as +per the Porter stemming algorithm. + +Note, the input to the stemming filter must already be in lower case, so +you will need to use +<<analysis-lowercase-tokenfilter,Lower +Case Token Filter>> or +<<analysis-lowercase-tokenizer,Lower +Case Tokenizer>> farther down the Tokenizer chain in order for this to +work properly!. For example, when using custom analyzer, make sure the +`lowercase` filter comes before the `porter_stem` filter in the list of +filters. diff --git a/docs/reference/analysis/tokenfilters/reverse-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/reverse-tokenfilter.asciidoc new file mode 100644 index 0000000..b004998 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/reverse-tokenfilter.asciidoc @@ -0,0 +1,4 @@ +[[analysis-reverse-tokenfilter]] +=== Reverse Token Filter + +A token filter of type `reverse` that simply reverses each token. diff --git a/docs/reference/analysis/tokenfilters/shingle-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/shingle-tokenfilter.asciidoc new file mode 100644 index 0000000..e3c6c44 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/shingle-tokenfilter.asciidoc @@ -0,0 +1,36 @@ +[[analysis-shingle-tokenfilter]] +=== Shingle Token Filter + +A token filter of type `shingle` that constructs shingles (token +n-grams) from a token stream. In other words, it creates combinations of +tokens as a single token. For example, the sentence "please divide this +sentence into shingles" might be tokenized into shingles "please +divide", "divide this", "this sentence", "sentence into", and "into +shingles". + +This filter handles position increments > 1 by inserting filler tokens +(tokens with termtext "_"). It does not handle a position increment of +0. + +The following are settings that can be set for a `shingle` token filter +type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`max_shingle_size` |The maximum shingle size. Defaults to `2`. + +|`min_shingle_size` |The minimum shingle size. Defaults to `2`. + +|`output_unigrams` |If `true` the output will contain the input tokens +(unigrams) as well as the shingles. Defaults to `true`. + +|`output_unigrams_if_no_shingles` |If `output_unigrams` is `false` the +output will contain the input tokens (unigrams) if no shingles are +available. Note if `output_unigrams` is set to `true` this setting has +no effect. Defaults to `false`. + +|`token_separator` |The string to use when joining adjacent tokens to +form a shingle. Defaults to `" "`. +|======================================================================= + diff --git a/docs/reference/analysis/tokenfilters/snowball-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/snowball-tokenfilter.asciidoc new file mode 100644 index 0000000..58d8898 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/snowball-tokenfilter.asciidoc @@ -0,0 +1,33 @@ +[[analysis-snowball-tokenfilter]] +=== Snowball Token Filter + +A filter that stems words using a Snowball-generated stemmer. The +`language` parameter controls the stemmer with the following available +values: `Armenian`, `Basque`, `Catalan`, `Danish`, `Dutch`, `English`, +`Finnish`, `French`, `German`, `German2`, `Hungarian`, `Italian`, `Kp`, +`Lovins`, `Norwegian`, `Porter`, `Portuguese`, `Romanian`, `Russian`, +`Spanish`, `Swedish`, `Turkish`. + +For example: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "my_analyzer" : { + "tokenizer" : "standard", + "filter" : ["standard", "lowercase", "my_snow"] + } + }, + "filter" : { + "my_snow" : { + "type" : "snowball", + "language" : "Lovins" + } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/standard-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/standard-tokenfilter.asciidoc new file mode 100644 index 0000000..3dd4fbf --- /dev/null +++ b/docs/reference/analysis/tokenfilters/standard-tokenfilter.asciidoc @@ -0,0 +1,7 @@ +[[analysis-standard-tokenfilter]] +=== Standard Token Filter + +A token filter of type `standard` that normalizes tokens extracted with +the +<<analysis-standard-tokenizer,Standard +Tokenizer>>. diff --git a/docs/reference/analysis/tokenfilters/stemmer-override-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/stemmer-override-tokenfilter.asciidoc new file mode 100644 index 0000000..649366c --- /dev/null +++ b/docs/reference/analysis/tokenfilters/stemmer-override-tokenfilter.asciidoc @@ -0,0 +1,34 @@ +[[analysis-stemmer-override-tokenfilter]] +=== Stemmer Override Token Filter + +Overrides stemming algorithms, by applying a custom mapping, then +protecting these terms from being modified by stemmers. Must be placed +before any stemming filters. + +Rules are separated by "=>" + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`rules` |A list of mapping rules to use. + +|`rules_path` |A path (either relative to `config` location, or +absolute) to a list of mappings. +|======================================================================= + +Here is an example: + +[source,js] +-------------------------------------------------- +index : + analysis : + analyzer : + myAnalyzer : + type : custom + tokenizer : standard + filter : [lowercase, custom_stems, porter_stem] + filter: + custom_stems: + type: stemmer_override + rules_path : analysis/custom_stems.txt +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/stemmer-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/stemmer-tokenfilter.asciidoc new file mode 100644 index 0000000..6526f37 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/stemmer-tokenfilter.asciidoc @@ -0,0 +1,78 @@ +[[analysis-stemmer-tokenfilter]] +=== Stemmer Token Filter + +A filter that stems words (similar to `snowball`, but with more +options). The `language`/`name` parameter controls the stemmer with the +following available values: + +http://lucene.apache.org/core/4_3_0/analyzers-common/index.html?org%2Fapache%2Flucene%2Fanalysis%2Far%2FArabicStemmer.html[arabic], +http://snowball.tartarus.org/algorithms/armenian/stemmer.html[armenian], +http://snowball.tartarus.org/algorithms/basque/stemmer.html[basque], +http://lucene.apache.org/core/4_3_0/analyzers-common/index.html?org%2Fapache%2Flucene%2Fanalysis%2Fbr%2FBrazilianStemmer.html[brazilian], +http://members.unine.ch/jacques.savoy/Papers/BUIR.pdf[bulgarian], +http://snowball.tartarus.org/algorithms/catalan/stemmer.html[catalan], +http://portal.acm.org/citation.cfm?id=1598600[czech], +http://snowball.tartarus.org/algorithms/danish/stemmer.html[danish], +http://snowball.tartarus.org/algorithms/dutch/stemmer.html[dutch], +http://snowball.tartarus.org/algorithms/english/stemmer.html[english], +http://snowball.tartarus.org/algorithms/finnish/stemmer.html[finnish], +http://snowball.tartarus.org/algorithms/french/stemmer.html[french], +http://snowball.tartarus.org/algorithms/german/stemmer.html[german], +http://snowball.tartarus.org/algorithms/german2/stemmer.html[german2], +http://sais.se/mthprize/2007/ntais2007.pdf[greek], +http://snowball.tartarus.org/algorithms/hungarian/stemmer.html[hungarian], +http://snowball.tartarus.org/algorithms/italian/stemmer.html[italian], +http://snowball.tartarus.org/algorithms/kraaij_pohlmann/stemmer.html[kp], +http://ciir.cs.umass.edu/pubfiles/ir-35.pdf[kstem], +http://snowball.tartarus.org/algorithms/lovins/stemmer.html[lovins], +http://lucene.apache.org/core/4_3_0/analyzers-common/index.html?org%2Fapache%2Flucene%2Fanalysis%2Flv%2FLatvianStemmer.html[latvian], +http://snowball.tartarus.org/algorithms/norwegian/stemmer.html[norwegian], +http://lucene.apache.org/core/4_3_0/analyzers-common/index.html?org%2Fapache%2Flucene%2Fanalysis%2Fno%2FNorwegianMinimalStemFilter.html[minimal_norwegian], +http://snowball.tartarus.org/algorithms/porter/stemmer.html[porter], +http://snowball.tartarus.org/algorithms/portuguese/stemmer.html[portuguese], +http://snowball.tartarus.org/algorithms/romanian/stemmer.html[romanian], +http://snowball.tartarus.org/algorithms/russian/stemmer.html[russian], +http://snowball.tartarus.org/algorithms/spanish/stemmer.html[spanish], +http://snowball.tartarus.org/algorithms/swedish/stemmer.html[swedish], +http://snowball.tartarus.org/algorithms/turkish/stemmer.html[turkish], +http://www.medialab.tfe.umu.se/courses/mdm0506a/material/fulltext_ID%3D10049387%26PLACEBO%3DIE.pdf[minimal_english], +http://lucene.apache.org/core/4_3_0/analyzers-common/index.html?org%2Fapache%2Flucene%2Fanalysis%2Fen%2FEnglishPossessiveFilter.html[possessive_english], +http://clef.isti.cnr.it/2003/WN_web/22.pdf[light_finnish], +http://dl.acm.org/citation.cfm?id=1141523[light_french], +http://dl.acm.org/citation.cfm?id=318984[minimal_french], +http://dl.acm.org/citation.cfm?id=1141523[light_german], +http://members.unine.ch/jacques.savoy/clef/morpho.pdf[minimal_german], +http://computing.open.ac.uk/Sites/EACLSouthAsia/Papers/p6-Ramanathan.pdf[hindi], +http://dl.acm.org/citation.cfm?id=1141523&dl=ACM&coll=DL&CFID=179095584&CFTOKEN=80067181[light_hungarian], +http://www.illc.uva.nl/Publications/ResearchReports/MoL-2003-02.text.pdf[indonesian], +http://www.ercim.eu/publication/ws-proceedings/CLEF2/savoy.pdf[light_italian], +http://dl.acm.org/citation.cfm?id=1141523&dl=ACM&coll=DL&CFID=179095584&CFTOKEN=80067181[light_portuguese], +http://www.inf.ufrgs.br/\~buriol/papers/Orengo_CLEF07.pdf[minimal_portuguese], +http://www.inf.ufrgs.br/\~viviane/rslp/index.htm[portuguese], +http://doc.rero.ch/lm.php?url=1000%2C43%2C4%2C20091209094227-CA%2FDolamic_Ljiljana_-_Indexing_and_Searching_Strategies_for_the_Russian_20091209.pdf[light_russian], +http://www.ercim.eu/publication/ws-proceedings/CLEF2/savoy.pdf[light_spanish], +http://clef.isti.cnr.it/2003/WN_web/22.pdf[light_swedish]. + +For example: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "my_analyzer" : { + "tokenizer" : "standard", + "filter" : ["standard", "lowercase", "my_stemmer"] + } + }, + "filter" : { + "my_stemmer" : { + "type" : "stemmer", + "name" : "light_german" + } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenfilters/stop-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/stop-tokenfilter.asciidoc new file mode 100644 index 0000000..14b3a32 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/stop-tokenfilter.asciidoc @@ -0,0 +1,35 @@ +[[analysis-stop-tokenfilter]] +=== Stop Token Filter + +A token filter of type `stop` that removes stop words from token +streams. + +The following are settings that can be set for a `stop` token filter +type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`stopwords` |A list of stop words to use. Defaults to english stop +words. + +|`stopwords_path` |A path (either relative to `config` location, or +absolute) to a stopwords file configuration. Each stop word should be in +its own "line" (separated by a line break). The file must be UTF-8 +encoded. + +|`ignore_case` |Set to `true` to lower case all words first. Defaults to +`false`. + +|`remove_trailing` |Set to `false` in order to not ignore the last term of +a search if it is a stop word. This is very useful for the completion +suggester as a query like `green a` can be extended to `green apple` even +though you remove stop words in general. Defaults to `true`. +|======================================================================= + +stopwords allow for custom language specific expansion of default +stopwords. It follows the `_lang_` notation and supports: arabic, +armenian, basque, brazilian, bulgarian, catalan, czech, danish, dutch, +english, finnish, french, galician, german, greek, hindi, hungarian, +indonesian, italian, norwegian, persian, portuguese, romanian, russian, +spanish, swedish, turkish. diff --git a/docs/reference/analysis/tokenfilters/synonym-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/synonym-tokenfilter.asciidoc new file mode 100644 index 0000000..ce6e1ed --- /dev/null +++ b/docs/reference/analysis/tokenfilters/synonym-tokenfilter.asciidoc @@ -0,0 +1,123 @@ +[[analysis-synonym-tokenfilter]] +=== Synonym Token Filter + +The `synonym` token filter allows to easily handle synonyms during the +analysis process. Synonyms are configured using a configuration file. +Here is an example: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "analysis" : { + "analyzer" : { + "synonym" : { + "tokenizer" : "whitespace", + "filter" : ["synonym"] + } + }, + "filter" : { + "synonym" : { + "type" : "synonym", + "synonyms_path" : "analysis/synonym.txt" + } + } + } + } +} +-------------------------------------------------- + +The above configures a `synonym` filter, with a path of +`analysis/synonym.txt` (relative to the `config` location). The +`synonym` analyzer is then configured with the filter. Additional +settings are: `ignore_case` (defaults to `false`), and `expand` +(defaults to `true`). + +The `tokenizer` parameter controls the tokenizers that will be used to +tokenize the synonym, and defaults to the `whitespace` tokenizer. + +Two synonym formats are supported: Solr, WordNet. + +[float] +==== Solr synonyms + +The following is a sample format of the file: + +[source,js] +-------------------------------------------------- +# blank lines and lines starting with pound are comments. + +#Explicit mappings match any token sequence on the LHS of "=>" +#and replace with all alternatives on the RHS. These types of mappings +#ignore the expand parameter in the schema. +#Examples: +i-pod, i pod => ipod, +sea biscuit, sea biscit => seabiscuit + +#Equivalent synonyms may be separated with commas and give +#no explicit mapping. In this case the mapping behavior will +#be taken from the expand parameter in the schema. This allows +#the same synonym file to be used in different synonym handling strategies. +#Examples: +ipod, i-pod, i pod +foozball , foosball +universe , cosmos + +# If expand==true, "ipod, i-pod, i pod" is equivalent to the explicit mapping: +ipod, i-pod, i pod => ipod, i-pod, i pod +# If expand==false, "ipod, i-pod, i pod" is equivalent to the explicit mapping: +ipod, i-pod, i pod => ipod + +#multiple synonym mapping entries are merged. +foo => foo bar +foo => baz +#is equivalent to +foo => foo bar, baz +-------------------------------------------------- + +You can also define synonyms for the filter directly in the +configuration file (note use of `synonyms` instead of `synonyms_path`): + +[source,js] +-------------------------------------------------- +{ + "filter" : { + "synonym" : { + "type" : "synonym", + "synonyms" : [ + "i-pod, i pod => ipod", + "universe, cosmos" + ] + } + } +} +-------------------------------------------------- + +However, it is recommended to define large synonyms set in a file using +`synonyms_path`. + +[float] +==== WordNet synonyms + +Synonyms based on http://wordnet.princeton.edu/[WordNet] format can be +declared using `format`: + +[source,js] +-------------------------------------------------- +{ + "filter" : { + "synonym" : { + "type" : "synonym", + "format" : "wordnet", + "synonyms" : [ + "s(100000001,1,'abstain',v,1,0).", + "s(100000001,2,'refrain',v,1,0).", + "s(100000001,3,'desist',v,1,0)." + ] + } + } +} +-------------------------------------------------- + +Using `synonyms_path` to define WordNet synonyms in a file is supported +as well. diff --git a/docs/reference/analysis/tokenfilters/trim-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/trim-tokenfilter.asciidoc new file mode 100644 index 0000000..34a0e93 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/trim-tokenfilter.asciidoc @@ -0,0 +1,4 @@ +[[analysis-trim-tokenfilter]] +=== Trim Token Filter + +The `trim` token filter trims the whitespace surrounding a token. diff --git a/docs/reference/analysis/tokenfilters/truncate-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/truncate-tokenfilter.asciidoc new file mode 100644 index 0000000..14652f4 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/truncate-tokenfilter.asciidoc @@ -0,0 +1,10 @@ +[[analysis-truncate-tokenfilter]] +=== Truncate Token Filter + +The `truncate` token filter can be used to truncate tokens into a +specific length. This can come in handy with keyword (single token) +based mapped fields that are used for sorting in order to reduce memory +usage. + +It accepts a `length` parameter which control the number of characters +to truncate to, defaults to `10`. diff --git a/docs/reference/analysis/tokenfilters/unique-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/unique-tokenfilter.asciidoc new file mode 100644 index 0000000..8b42f6b --- /dev/null +++ b/docs/reference/analysis/tokenfilters/unique-tokenfilter.asciidoc @@ -0,0 +1,7 @@ +[[analysis-unique-tokenfilter]] +=== Unique Token Filter + +The `unique` token filter can be used to only index unique tokens during +analysis. By default it is applied on all the token stream. If +`only_on_same_position` is set to `true`, it will only remove duplicate +tokens on the same position. diff --git a/docs/reference/analysis/tokenfilters/word-delimiter-tokenfilter.asciidoc b/docs/reference/analysis/tokenfilters/word-delimiter-tokenfilter.asciidoc new file mode 100644 index 0000000..9ce81e1 --- /dev/null +++ b/docs/reference/analysis/tokenfilters/word-delimiter-tokenfilter.asciidoc @@ -0,0 +1,80 @@ +[[analysis-word-delimiter-tokenfilter]] +=== Word Delimiter Token Filter + +Named `word_delimiter`, it Splits words into subwords and performs +optional transformations on subword groups. Words are split into +subwords with the following rules: + +* split on intra-word delimiters (by default, all non alpha-numeric +characters). +* "Wi-Fi" -> "Wi", "Fi" +* split on case transitions: "PowerShot" -> "Power", "Shot" +* split on letter-number transitions: "SD500" -> "SD", "500" +* leading and trailing intra-word delimiters on each subword are +ignored: "//hello---there, 'dude'" -> "hello", "there", "dude" +* trailing "'s" are removed for each subword: "O'Neil's" -> "O", "Neil" + +Parameters include: + +`generate_word_parts`:: + If `true` causes parts of words to be + generated: "PowerShot" => "Power" "Shot". Defaults to `true`. + +`generate_number_parts`:: + If `true` causes number subwords to be + generated: "500-42" => "500" "42". Defaults to `true`. + +`catenate_words`:: + If `true` causes maximum runs of word parts to be + catenated: "wi-fi" => "wifi". Defaults to `false`. + +`catenate_numbers`:: + If `true` causes maximum runs of number parts to + be catenated: "500-42" => "50042". Defaults to `false`. + +`catenate_all`:: + If `true` causes all subword parts to be catenated: + "wi-fi-4000" => "wifi4000". Defaults to `false`. + +`split_on_case_change`:: + If `true` causes "PowerShot" to be two tokens; + ("Power-Shot" remains two parts regards). Defaults to `true`. + +`preserve_original`:: + If `true` includes original words in subwords: + "500-42" => "500-42" "500" "42". Defaults to `false`. + +`split_on_numerics`:: + If `true` causes "j2se" to be three tokens; "j" + "2" "se". Defaults to `true`. + +`stem_english_possessive`:: + If `true` causes trailing "'s" to be + removed for each subword: "O'Neil's" => "O", "Neil". Defaults to `true`. + +Advance settings include: + +`protected_words`:: + A list of protected words from being delimiter. + Either an array, or also can set `protected_words_path` which resolved + to a file configured with protected words (one on each line). + Automatically resolves to `config/` based location if exists. + +`type_table`:: + A custom type mapping table, for example (when configured + using `type_table_path`): + +[source,js] +-------------------------------------------------- + # Map the $, %, '.', and ',' characters to DIGIT + # This might be useful for financial data. + $ => DIGIT + % => DIGIT + . => DIGIT + \\u002C => DIGIT + + # in some cases you might not want to split on ZWJ + # this also tests the case where we need a bigger byte[] + # see http://en.wikipedia.org/wiki/Zero-width_joiner + \\u200D => ALPHANUM +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenizers.asciidoc b/docs/reference/analysis/tokenizers.asciidoc new file mode 100644 index 0000000..3118b0d --- /dev/null +++ b/docs/reference/analysis/tokenizers.asciidoc @@ -0,0 +1,30 @@ +[[analysis-tokenizers]] +== Tokenizers + +Tokenizers are used to break a string down into a stream of terms +or tokens. A simple tokenizer might split the string up into terms +wherever it encounters whitespace or punctuation. + +Elasticsearch has a number of built in tokenizers which can be +used to build <<analysis-custom-analyzer,custom analyzers>>. + +include::tokenizers/standard-tokenizer.asciidoc[] + +include::tokenizers/edgengram-tokenizer.asciidoc[] + +include::tokenizers/keyword-tokenizer.asciidoc[] + +include::tokenizers/letter-tokenizer.asciidoc[] + +include::tokenizers/lowercase-tokenizer.asciidoc[] + +include::tokenizers/ngram-tokenizer.asciidoc[] + +include::tokenizers/whitespace-tokenizer.asciidoc[] + +include::tokenizers/pattern-tokenizer.asciidoc[] + +include::tokenizers/uaxurlemail-tokenizer.asciidoc[] + +include::tokenizers/pathhierarchy-tokenizer.asciidoc[] + diff --git a/docs/reference/analysis/tokenizers/edgengram-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/edgengram-tokenizer.asciidoc new file mode 100644 index 0000000..41cc233 --- /dev/null +++ b/docs/reference/analysis/tokenizers/edgengram-tokenizer.asciidoc @@ -0,0 +1,80 @@ +[[analysis-edgengram-tokenizer]] +=== Edge NGram Tokenizer + +A tokenizer of type `edgeNGram`. + +This tokenizer is very similar to `nGram` but only keeps n-grams which +start at the beginning of a token. + +The following are settings that can be set for a `edgeNGram` tokenizer +type: + +[cols="<,<,<",options="header",] +|======================================================================= +|Setting |Description |Default value +|`min_gram` |Minimum size in codepoints of a single n-gram |`1`. + +|`max_gram` |Maximum size in codepoints of a single n-gram |`2`. + +|`token_chars` | Characters classes to keep in the +tokens, Elasticsearch will split on characters that don't belong to any +of these classes. |`[]` (Keep all characters) +|======================================================================= + + +`token_chars` accepts the following character classes: + +[horizontal] +`letter`:: for example `a`, `b`, `ï` or `京` +`digit`:: for example `3` or `7` +`whitespace`:: for example `" "` or `"\n"` +`punctuation`:: for example `!` or `"` +`symbol`:: for example `$` or `√` + +[float] +==== Example + +[source,js] +-------------------------------------------------- + curl -XPUT 'localhost:9200/test' -d ' + { + "settings" : { + "analysis" : { + "analyzer" : { + "my_edge_ngram_analyzer" : { + "tokenizer" : "my_edge_ngram_tokenizer" + } + }, + "tokenizer" : { + "my_edge_ngram_tokenizer" : { + "type" : "edgeNGram", + "min_gram" : "2", + "max_gram" : "5", + "token_chars": [ "letter", "digit" ] + } + } + } + } + }' + + curl 'localhost:9200/test/_analyze?pretty=1&analyzer=my_edge_ngram_analyzer' -d 'FC Schalke 04' + # FC, Sc, Sch, Scha, Schal, 04 +-------------------------------------------------- + +[float] +==== `side` deprecated + +There used to be a `side` parameter up to `0.90.1` but it is now deprecated. In +order to emulate the behavior of `"side" : "BACK"` a +<<analysis-reverse-tokenfilter,`reverse` token filter>> should be used together +with the <<analysis-edgengram-tokenfilter,`edgeNGram` token filter>>. The +`edgeNGram` filter must be enclosed in `reverse` filters like this: + +[source,js] +-------------------------------------------------- + "filter" : ["reverse", "edgeNGram", "reverse"] +-------------------------------------------------- + +which essentially reverses the token, builds front `EdgeNGrams` and reverses +the ngram again. This has the same effect as the previous `"side" : "BACK"` setting. + diff --git a/docs/reference/analysis/tokenizers/keyword-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/keyword-tokenizer.asciidoc new file mode 100644 index 0000000..be75f3d --- /dev/null +++ b/docs/reference/analysis/tokenizers/keyword-tokenizer.asciidoc @@ -0,0 +1,15 @@ +[[analysis-keyword-tokenizer]] +=== Keyword Tokenizer + +A tokenizer of type `keyword` that emits the entire input as a single +input. + +The following are settings that can be set for a `keyword` tokenizer +type: + +[cols="<,<",options="header",] +|======================================================= +|Setting |Description +|`buffer_size` |The term buffer size. Defaults to `256`. +|======================================================= + diff --git a/docs/reference/analysis/tokenizers/letter-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/letter-tokenizer.asciidoc new file mode 100644 index 0000000..03025cc --- /dev/null +++ b/docs/reference/analysis/tokenizers/letter-tokenizer.asciidoc @@ -0,0 +1,7 @@ +[[analysis-letter-tokenizer]] +=== Letter Tokenizer + +A tokenizer of type `letter` that divides text at non-letters. That's to +say, it defines tokens as maximal strings of adjacent letters. Note, +this does a decent job for most European languages, but does a terrible +job for some Asian languages, where words are not separated by spaces. diff --git a/docs/reference/analysis/tokenizers/lowercase-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/lowercase-tokenizer.asciidoc new file mode 100644 index 0000000..0cdbbc3 --- /dev/null +++ b/docs/reference/analysis/tokenizers/lowercase-tokenizer.asciidoc @@ -0,0 +1,15 @@ +[[analysis-lowercase-tokenizer]] +=== Lowercase Tokenizer + +A tokenizer of type `lowercase` that performs the function of +<<analysis-letter-tokenizer,Letter +Tokenizer>> and +<<analysis-lowercase-tokenfilter,Lower +Case Token Filter>> together. It divides text at non-letters and converts +them to lower case. While it is functionally equivalent to the +combination of +<<analysis-letter-tokenizer,Letter +Tokenizer>> and +<<analysis-lowercase-tokenfilter,Lower +Case Token Filter>>, there is a performance advantage to doing the two +tasks at once, hence this (redundant) implementation. diff --git a/docs/reference/analysis/tokenizers/ngram-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/ngram-tokenizer.asciidoc new file mode 100644 index 0000000..23e6bc5 --- /dev/null +++ b/docs/reference/analysis/tokenizers/ngram-tokenizer.asciidoc @@ -0,0 +1,57 @@ +[[analysis-ngram-tokenizer]] +=== NGram Tokenizer + +A tokenizer of type `nGram`. + +The following are settings that can be set for a `nGram` tokenizer type: + +[cols="<,<,<",options="header",] +|======================================================================= +|Setting |Description |Default value +|`min_gram` |Minimum size in codepoints of a single n-gram |`1`. + +|`max_gram` |Maximum size in codepoints of a single n-gram |`2`. + +|`token_chars` |Characters classes to keep in the +tokens, Elasticsearch will split on characters that don't belong to any +of these classes. |`[]` (Keep all characters) +|======================================================================= + +`token_chars` accepts the following character classes: + +[horizontal] +`letter`:: for example `a`, `b`, `ï` or `京` +`digit`:: for example `3` or `7` +`whitespace`:: for example `" "` or `"\n"` +`punctuation`:: for example `!` or `"` +`symbol`:: for example `$` or `√` + +[float] +==== Example + +[source,js] +-------------------------------------------------- + curl -XPUT 'localhost:9200/test' -d ' + { + "settings" : { + "analysis" : { + "analyzer" : { + "my_ngram_analyzer" : { + "tokenizer" : "my_ngram_tokenizer" + } + }, + "tokenizer" : { + "my_ngram_tokenizer" : { + "type" : "nGram", + "min_gram" : "2", + "max_gram" : "3", + "token_chars": [ "letter", "digit" ] + } + } + } + } + }' + + curl 'localhost:9200/test/_analyze?pretty=1&analyzer=my_ngram_analyzer' -d 'FC Schalke 04' + # FC, Sc, Sch, ch, cha, ha, hal, al, alk, lk, lke, ke, 04 +-------------------------------------------------- diff --git a/docs/reference/analysis/tokenizers/pathhierarchy-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/pathhierarchy-tokenizer.asciidoc new file mode 100644 index 0000000..e6876f5 --- /dev/null +++ b/docs/reference/analysis/tokenizers/pathhierarchy-tokenizer.asciidoc @@ -0,0 +1,32 @@ +[[analysis-pathhierarchy-tokenizer]] +=== Path Hierarchy Tokenizer + +The `path_hierarchy` tokenizer takes something like this: + +------------------------- +/something/something/else +------------------------- + +And produces tokens: + +------------------------- +/something +/something/something +/something/something/else +------------------------- + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`delimiter` |The character delimiter to use, defaults to `/`. + +|`replacement` |An optional replacement character to use. Defaults to +the `delimiter`. + +|`buffer_size` |The buffer size to use, defaults to `1024`. + +|`reverse` |Generates tokens in reverse order, defaults to `false`. + +|`skip` |Controls initial tokens to skip, defaults to `0`. +|======================================================================= + diff --git a/docs/reference/analysis/tokenizers/pattern-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/pattern-tokenizer.asciidoc new file mode 100644 index 0000000..72ca604 --- /dev/null +++ b/docs/reference/analysis/tokenizers/pattern-tokenizer.asciidoc @@ -0,0 +1,29 @@ +[[analysis-pattern-tokenizer]] +=== Pattern Tokenizer + +A tokenizer of type `pattern` that can flexibly separate text into terms +via a regular expression. Accepts the following settings: + +[cols="<,<",options="header",] +|====================================================================== +|Setting |Description +|`pattern` |The regular expression pattern, defaults to `\\W+`. +|`flags` |The regular expression flags. +|`group` |Which group to extract into tokens. Defaults to `-1` (split). +|====================================================================== + +*IMPORTANT*: The regular expression should match the *token separators*, +not the tokens themselves. + +`group` set to `-1` (the default) is equivalent to "split". Using group +>= 0 selects the matching group as the token. For example, if you have: + +------------------------ +pattern = \\'([^\']+)\\' +group = 0 +input = aaa 'bbb' 'ccc' +------------------------ + +the output will be two tokens: 'bbb' and 'ccc' (including the ' marks). +With the same input but using group=1, the output would be: bbb and ccc +(no ' marks). diff --git a/docs/reference/analysis/tokenizers/standard-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/standard-tokenizer.asciidoc new file mode 100644 index 0000000..c8b405b --- /dev/null +++ b/docs/reference/analysis/tokenizers/standard-tokenizer.asciidoc @@ -0,0 +1,18 @@ +[[analysis-standard-tokenizer]] +=== Standard Tokenizer + +A tokenizer of type `standard` providing grammar based tokenizer that is +a good tokenizer for most European language documents. The tokenizer +implements the Unicode Text Segmentation algorithm, as specified in +http://unicode.org/reports/tr29/[Unicode Standard Annex #29]. + +The following are settings that can be set for a `standard` tokenizer +type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`max_token_length` |The maximum token length. If a token is seen that +exceeds this length then it is discarded. Defaults to `255`. +|======================================================================= + diff --git a/docs/reference/analysis/tokenizers/uaxurlemail-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/uaxurlemail-tokenizer.asciidoc new file mode 100644 index 0000000..9ed28e6 --- /dev/null +++ b/docs/reference/analysis/tokenizers/uaxurlemail-tokenizer.asciidoc @@ -0,0 +1,16 @@ +[[analysis-uaxurlemail-tokenizer]] +=== UAX Email URL Tokenizer + +A tokenizer of type `uax_url_email` which works exactly like the +`standard` tokenizer, but tokenizes emails and urls as single tokens. + +The following are settings that can be set for a `uax_url_email` +tokenizer type: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`max_token_length` |The maximum token length. If a token is seen that +exceeds this length then it is discarded. Defaults to `255`. +|======================================================================= + diff --git a/docs/reference/analysis/tokenizers/whitespace-tokenizer.asciidoc b/docs/reference/analysis/tokenizers/whitespace-tokenizer.asciidoc new file mode 100644 index 0000000..f0e1ce2 --- /dev/null +++ b/docs/reference/analysis/tokenizers/whitespace-tokenizer.asciidoc @@ -0,0 +1,4 @@ +[[analysis-whitespace-tokenizer]] +=== Whitespace Tokenizer + +A tokenizer of type `whitespace` that divides text at whitespace. diff --git a/docs/reference/api-conventions.asciidoc b/docs/reference/api-conventions.asciidoc new file mode 100644 index 0000000..b9e9516 --- /dev/null +++ b/docs/reference/api-conventions.asciidoc @@ -0,0 +1,269 @@ +[[api-conventions]] += API Conventions + +[partintro] +-- +The *elasticsearch* REST APIs are exposed using: + +* <<modules-http,JSON over HTTP>>, +* <<modules-thrift,thrift>>, +* <<modules-memcached,memcached>>. + +The conventions listed in this chapter can be applied throughout the REST +API, unless otherwise specified. + +* <<multi-index>> +* <<common-options>> + +-- + +[[multi-index]] +== Multiple Indices + +Most APIs that refer to an `index` parameter support execution across multiple indices, +using simple `test1,test2,test3` notation (or `_all` for all indices). It also +support wildcards, for example: `test*`, and the ability to "add" (`+`) +and "remove" (`-`), for example: `+test*,-test3`. + +All multi indices API support the following url query string parameters: + +`ignore_unavailable`:: + +Controls whether to ignore if any specified indices are unavailable, this +includes indices that don't exist or closed indices. Either `true` or `false` +can be specified. + +`allow_no_indices`:: + +Controls whether to fail if a wildcard indices expressions results into no +concrete indices. Either `true` or `false` can be specified. For example if +the wildcard expression `foo*` is specified and no indices are available that +start with `foo` then depending on this setting the request will fail. This +setting is also applicable when `_all`, `*` or no index has been specified. + +`expand_wildcards`:: + +Controls to what kind of concrete indices wildcard indices expression expand +to. If `open` is specified then the wildcard expression if expanded to only +open indices and if `closed` is specified then the wildcard expression if +expanded only to closed indices. Also both values (`open,closed`) can be +specified to expand to all indices. + +The defaults settings for the above parameters depend on the api being used. + +NOTE: Single index APIs such as the <<docs>> and the +<<indices-aliases,single-index `alias` APIs>> do not support multiple indices. + +[[common-options]] +== Common options + +The following options can be applied to all of the REST APIs. + +[float] +=== Pretty Results + +When appending `?pretty=true` to any request made, the JSON returned +will be pretty formatted (use it for debugging only!). Another option is +to set `format=yaml` which will cause the result to be returned in the +(sometimes) more readable yaml format. + + +[float] +=== Human readable output + +Statistics are returned in a format suitable for humans +(eg `"exists_time": "1h"` or `"size": "1kb"`) and for computers +(eg `"exists_time_in_millis": 3600000`` or `"size_in_bytes": 1024`). +The human readable values can be turned off by adding `?human=false` +to the query string. This makes sense when the stats results are +being consumed by a monitoring tool, rather than intended for human +consumption. The default for the `human` flag is +`false`. added[1.00.Beta,Previously defaulted to `true`] + +[float] +=== Flat Settings + +The `flat_settings` flag affects rendering of the lists of settings. When +flat_settings` flag is `true` settings are returned in a flat format: + +[source,js] +-------------------------------------------------- +{ + "persistent" : { }, + "transient" : { + "discovery.zen.minimum_master_nodes" : "1" + } +} +-------------------------------------------------- + +When the `flat_settings` flag is `false` settings are returned in a more +human readable structured format: + +[source,js] +-------------------------------------------------- +{ + "persistent" : { }, + "transient" : { + "discovery" : { + "zen" : { + "minimum_master_nodes" : "1" + } + } + } +} +-------------------------------------------------- + +By default the `flat_settings` is set to `false`. + +[float] +=== Parameters + +Rest parameters (when using HTTP, map to HTTP URL parameters) follow the +convention of using underscore casing. + +[float] +=== Boolean Values + +All REST APIs parameters (both request parameters and JSON body) support +providing boolean "false" as the values: `false`, `0`, `no` and `off`. +All other values are considered "true". Note, this is not related to +fields within a document indexed treated as boolean fields. + +[float] +=== Number Values + +All REST APIs support providing numbered parameters as `string` on top +of supporting the native JSON number types. + +[[time-units]] +[float] +=== Time units + +Whenever durations need to be specified, eg for a `timeout` parameter, the duration +can be specified as a whole number representing time in milliseconds, or as a time value like `2d` for 2 days. The supported units are: + +[horizontal] +`y`:: Year +`M`:: Month +`w`:: Week +`h`:: Hour +`m`:: Minute +`s`:: Second + +[[distance-units]] +[float] +=== Distance Units + +Wherever distances need to be specified, such as the `distance` parameter in +the <<query-dsl-geo-distance-filter>>) or the `precision` parameter in the +<<query-dsl-geohash-cell-filter>>, the default unit if none is specified is +the meter. Distances can be specified in other units, such as `"1km"` or +`"2mi"` (2 miles). + +The full list of units is listed below: + +[horizontal] +Mile:: `mi` or `miles` +Yard:: `yd` or `yards` +Feet:: `ft` or `feet` +Inch:: `in` or `inch` +Kilometer:: `km` or `kilometers` +Meter:: `m` or `meters` +Centimeter:: `cm` or `centimeters` +Millimeter:: `mm` or `millimeters` + + +[[fuzziness]] +[float] +=== Fuzziness + +Some queries and APIs support parameters to allow inexact _fuzzy_ matching, +using the `fuzziness` parameter. The `fuzziness` parameter is context +sensitive which means that it depends on the type of the field being queried: + +[float] +==== Numeric, date and IPv4 fields + +When querying numeric, date and IPv4 fields, `fuzziness` is interpreted as a +`+/- margin. It behaves like a <<query-dsl-range-query>> where: + + -fuzziness <= field value <= +fuzziness + +The `fuzziness` parameter should be set to a numeric value, eg `2` or `2.0`. A +`date` field interprets a long as milliseconds, but also accepts a string +containing a time value -- `"1h"` -- as explained in <<time-units>>. An `ip` +field accepts a long or another IPv4 address (which will be converted into a +long). + +[float] +==== String fields + +When querying `string` fields, `fuzziness` is interpreted as a +http://en.wikipedia.org/wiki/Levenshtein_distance[Levenshtein Edit Distance] +-- the number of one character changes that need to be made to one string to +make it the same as another string. + +The `fuzziness` parameter can be specified as: + +`0`, `1`, `2`:: + +the maximum allowed Levenshtein Edit Distance (or number of edits) + +`AUTO`:: ++ +-- +generates an edit distance based on the length of the term. For lengths: + +`0..1`:: must match exactly +`1..4`:: one edit allowed +`>4`:: two edits allowed + +`AUTO` should generally be the preferred value for `fuzziness`. +-- + +`0.0..1.0`:: + +converted into an edit distance using the formula: `length(term) * (1.0 - +fuzziness)`, eg a `fuzziness` of `0.6` with a term of length 10 would result +in an edit distance of `4`. Note: in all APIs except for the +<<query-dsl-flt-query>>, the maximum allowed edit distance is `2`. + + + +[float] +=== Result Casing + +All REST APIs accept the `case` parameter. When set to `camelCase`, all +field names in the result will be returned in camel casing, otherwise, +underscore casing will be used. Note, this does not apply to the source +document indexed. + +[float] +=== JSONP + +All REST APIs accept a `callback` parameter resulting in a +http://en.wikipedia.org/wiki/JSONP[JSONP] result. + +[float] +=== Request body in query string + +For libraries that don't accept a request body for non-POST requests, +you can pass the request body as the `source` query string parameter +instead. + +[[url-access-control]] +== URL-based access control + +Many users use a proxy with URL-based access control to secure access to +Elasticsearch indices. For <<search-multi-search,multi-search>>, +<<docs-multi-get,multi-get>> and <<docs-bulk,bulk>> requests, the user has +the choice of specifying an index in the URL and on each individual request +within the request body. This can make URL-based access control challenging. + +To prevent the user from overriding the index which has been specified in the +URL, add this setting to the `config.yml` file: + + rest.action.multi.allow_explicit_index: false + +The default value is `true`, but when set to `false`, Elasticsearch will +reject requests that have an explicit index specified in the request body. diff --git a/docs/reference/cat.asciidoc b/docs/reference/cat.asciidoc new file mode 100644 index 0000000..0aa2d6f --- /dev/null +++ b/docs/reference/cat.asciidoc @@ -0,0 +1,117 @@ +[[cat]] += cat APIs + +[partintro] +-- + +["float",id="intro"] +== Introduction + +JSON is great... for computers. Even if it's pretty-printed, trying +to find relationships in the data is tedious. Human eyes, especially +when looking at an ssh terminal, need compact and aligned text. The +cat API aims to meet this need. + +All the cat commands accept a query string parameter `help` to see all +the headers and info they provide, and the `/_cat` command alone lists all +the available commands. + +[float] +[[common-parameters]] +== Common parameters + +[float] +[[verbose]] +=== Verbose + +Each of the commands accepts a query string parameter `v` to turn on +verbose output. + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/master?v' +id ip node +EGtKWZlWQYWDmX29fUnp3Q 127.0.0.1 Grey, Sara +-------------------------------------------------- + +[float] +[[help]] +=== Help + +Each of the commands accepts a query string parameter `help` which will +output its available columns. + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/master?help' +id | node id +ip | node transport ip address +node | node name +-------------------------------------------------- + +[float] +[[headers]] +=== Headers + +Each of the commands accepts a query string parameter `h` which forces +only those columns to appear. + +[source,shell] +-------------------------------------------------- +% curl 'n1:9200/_cat/nodes?h=ip,port,heapPercent,name' +192.168.56.40 9300 40.3 Captain Universe +192.168.56.20 9300 15.3 Kaluu +192.168.56.50 9300 17.0 Yellowjacket +192.168.56.10 9300 12.3 Remy LeBeau +192.168.56.30 9300 43.9 Ramsey, Doug +-------------------------------------------------- + +[float] +[[numeric-formats]] +=== Numeric formats + +Many commands provide a few types of numeric output, either a byte +value or a time value. By default, these types are human-formatted, +for example, `3.5mb` instead of `3763212`. The human values are not +sortable numerically, so in order to operate on these values where +order is important, you can change it. + +Say you want to find the largest index in your cluster (storage used +by all the shards, not number of documents). The `/_cat/indices` API +is ideal. We only need to tweak two things. First, we want to turn +off human mode. We'll use a byte-level resolution. Then we'll pipe +our output into `sort` using the appropriate column, which in this +case is the eight one. + +[source,shell] +-------------------------------------------------- +% curl '192.168.56.10:9200/_cat/indices?bytes=b' | sort -rnk8 +green wiki2 3 0 10000 0 105274918 105274918 +green wiki1 3 0 10000 413 103776272 103776272 +green foo 1 0 227 0 2065131 2065131 +-------------------------------------------------- + + +-- + +include::cat/alias.asciidoc[] + +include::cat/allocation.asciidoc[] + +include::cat/count.asciidoc[] + +include::cat/health.asciidoc[] + +include::cat/indices.asciidoc[] + +include::cat/master.asciidoc[] + +include::cat/nodes.asciidoc[] + +include::cat/pending_tasks.asciidoc[] + +include::cat/recovery.asciidoc[] + +include::cat/thread_pool.asciidoc[] + +include::cat/shards.asciidoc[] diff --git a/docs/reference/cat/alias.asciidoc b/docs/reference/cat/alias.asciidoc new file mode 100644 index 0000000..301a9f8 --- /dev/null +++ b/docs/reference/cat/alias.asciidoc @@ -0,0 +1,22 @@ +[[cat-alias]] +== Aliases + +`aliases` shows information about currently configured aliases to indices +including filter and routing infos. + +[source,shell] +-------------------------------------------------- +% curl '192.168.56.10:9200/_cat/aliases?v' +alias index filter indexRouting searchRouting +alias2 test1 * - - +alias4 test1 - 2 1,2 +alias1 test1 - - - +alias3 test1 - 1 1 +-------------------------------------------------- + +The output shows that `alias` has configured a filter, and specific routing +configurations in `alias3` and `alias4`. + +If you only want to get information about a single alias, you can specify +the alias in the URL, for example `/_cat/aliases/alias1`. + diff --git a/docs/reference/cat/allocation.asciidoc b/docs/reference/cat/allocation.asciidoc new file mode 100644 index 0000000..4b3e49a --- /dev/null +++ b/docs/reference/cat/allocation.asciidoc @@ -0,0 +1,17 @@ +[[cat-allocation]] +== Allocation + +`allocation` provides a snapshot of how shards have located around the +cluster and the state of disk usage. + +[source,shell] +-------------------------------------------------- +% curl '192.168.56.10:9200/_cat/allocation?v' +shards diskUsed diskAvail diskRatio ip node + 1 5.6gb 72.2gb 7.8% 192.168.56.10 Jarella + 1 5.6gb 72.2gb 7.8% 192.168.56.30 Solarr + 1 5.5gb 72.3gb 7.6% 192.168.56.20 Adam II +-------------------------------------------------- + +Here we can see that each node has been allocated a single shard and +that they're all using about the same amount of space. diff --git a/docs/reference/cat/count.asciidoc b/docs/reference/cat/count.asciidoc new file mode 100644 index 0000000..fb57638 --- /dev/null +++ b/docs/reference/cat/count.asciidoc @@ -0,0 +1,16 @@ +[[cat-count]] +== Count + +`count` provides quick access to the document count of the entire +cluster, or individual indices. + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.10:9200/_cat/indices +green wiki1 3 0 10000 331 168.5mb 168.5mb +green wiki2 3 0 428 0 8mb 8mb +% curl 192.168.56.10:9200/_cat/count +1384314124582 19:42:04 10428 +% curl 192.168.56.10:9200/_cat/count/wiki2 +1384314139815 19:42:19 428 +-------------------------------------------------- diff --git a/docs/reference/cat/health.asciidoc b/docs/reference/cat/health.asciidoc new file mode 100644 index 0000000..654e446 --- /dev/null +++ b/docs/reference/cat/health.asciidoc @@ -0,0 +1,61 @@ +[[cat-health]] +== Health + +`health` is a terse, one-line representation of the same information +from `/_cluster/health`. It has one option `ts` to disable the +timestamping. + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.10:9200/_cat/health +1384308967 18:16:07 foo green 3 3 3 3 0 0 0 +% curl '192.168.56.10:9200/_cat/health?v&ts=0' +cluster status nodeTotal nodeData shards pri relo init unassign +foo green 3 3 3 3 0 0 0 +-------------------------------------------------- + +A common use of this command is to verify the health is consistent +across nodes: + +[source,shell] +-------------------------------------------------- +% pssh -i -h list.of.cluster.hosts curl -s localhost:9200/_cat/health +[1] 20:20:52 [SUCCESS] es3.vm +1384309218 18:20:18 foo green 3 3 3 3 0 0 0 +[2] 20:20:52 [SUCCESS] es1.vm +1384309218 18:20:18 foo green 3 3 3 3 0 0 0 +[3] 20:20:52 [SUCCESS] es2.vm +1384309218 18:20:18 foo green 3 3 3 3 0 0 0 +-------------------------------------------------- + +A less obvious use is to track recovery of a large cluster over +time. With enough shards, starting a cluster, or even recovering after +losing a node, can take time (depending on your network & disk). A way +to track its progress is by using this command in a delayed loop: + +[source,shell] +-------------------------------------------------- +% while true; do curl 192.168.56.10:9200/_cat/health; sleep 120; done +1384309446 18:24:06 foo red 3 3 20 20 0 0 1812 +1384309566 18:26:06 foo yellow 3 3 950 916 0 12 870 +1384309686 18:28:06 foo yellow 3 3 1328 916 0 12 492 +1384309806 18:30:06 foo green 3 3 1832 916 4 0 0 +^C +-------------------------------------------------- + +In this scenario, we can tell that recovery took roughly four minutes. +If this were going on for hours, we would be able to watch the +`UNASSIGNED` shards drop precipitously. If that number remained +static, we would have an idea that there is a problem. + +[float] +[[timestamp]] +=== Why the timestamp? + +You typically are using the `health` command when a cluster is +malfunctioning. During this period, it's extremely important to +correlate activities across log files, alerting systems, etc. + +There are two outputs. The `HH:MM:SS` output is simply for quick +human consumption. The epoch time retains more information, including +date, and is machine sortable if your recovery spans days. diff --git a/docs/reference/cat/indices.asciidoc b/docs/reference/cat/indices.asciidoc new file mode 100644 index 0000000..0cd202f --- /dev/null +++ b/docs/reference/cat/indices.asciidoc @@ -0,0 +1,57 @@ +[[cat-indices]] +== Indices + +The `indices` command provides a cross-section of each index. This +information *spans nodes*. + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/indices/twi*?v' +health index pri rep docs.count docs.deleted store.size pri.store.size +green twitter 5 1 11434 0 64mb 32mb +green twitter2 2 0 2030 0 5.8mb 5.8mb +-------------------------------------------------- + +We can tell quickly how many shards make up an index, the number of +docs, deleted docs, primary store size, and total store size (all +shards including replicas). + +[float] +[[pri-flag]] +=== Primaries + +The index stats by default will show them for all of an index's +shards, including replicas. A `pri` flag can be supplied to enable +the view of relevant stats in the context of only the primaries. + +[float] +[[examples]] +=== Examples + +Which indices are yellow? + +[source,shell] +-------------------------------------------------- +% curl localhost:9200/_cat/indices | grep ^yell +yellow wiki 2 1 6401 1115 151.4mb 151.4mb +yellow twitter 5 1 11434 0 32mb 32mb +-------------------------------------------------- + +What's my largest index by disk usage not including replicas? + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/indices?bytes=b' | sort -rnk7 +green wiki 2 0 6401 1115 158843725 158843725 +green twitter 5 1 11434 0 67155614 33577857 +green twitter2 2 0 2030 0 6125085 6125085 +-------------------------------------------------- + +How many merge operations have the shards for the `wiki` completed? + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/indices/wiki?pri&v&h=health,index,prirep,docs.count,mt' +health index docs.count mt pri.mt +green wiki 9646 16 16 +-------------------------------------------------- diff --git a/docs/reference/cat/master.asciidoc b/docs/reference/cat/master.asciidoc new file mode 100644 index 0000000..9c2e249 --- /dev/null +++ b/docs/reference/cat/master.asciidoc @@ -0,0 +1,27 @@ +[[cat-master]] +== Master + +`master` doesn't have any extra options. It simply displays the +master's node ID, bound IP address, and node name. + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/master?v' +id ip node +Ntgn2DcuTjGuXlhKDUD4vA 192.168.56.30 Solarr +-------------------------------------------------- + +This information is also available via the `nodes` command, but this +is slightly shorter when all you want to do, for example, is verify +all nodes agree on the master: + +[source,shell] +-------------------------------------------------- +% pssh -i -h list.of.cluster.hosts curl -s localhost:9200/_cat/master +[1] 19:16:37 [SUCCESS] es3.vm +Ntgn2DcuTjGuXlhKDUD4vA 192.168.56.30 Solarr +[2] 19:16:37 [SUCCESS] es2.vm +Ntgn2DcuTjGuXlhKDUD4vA 192.168.56.30 Solarr +[3] 19:16:37 [SUCCESS] es1.vm +Ntgn2DcuTjGuXlhKDUD4vA 192.168.56.30 Solarr +-------------------------------------------------- diff --git a/docs/reference/cat/nodes.asciidoc b/docs/reference/cat/nodes.asciidoc new file mode 100644 index 0000000..a500825 --- /dev/null +++ b/docs/reference/cat/nodes.asciidoc @@ -0,0 +1,48 @@ +[[cat-nodes]] +== Nodes + +The `nodes` command shows the cluster topology. + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.10:9200/_cat/nodes +SP4H 4727 192.168.56.30 9300 1.0.0.Beta2 1.6.0_27 72.1gb 35.4 93.9mb 79 239.1mb 0.45 3.4h d m Boneyard +_uhJ 5134 192.168.56.10 9300 1.0.0.Beta2 1.6.0_27 72.1gb 33.3 93.9mb 85 239.1mb 0.06 3.4h d * Athena +HfDp 4562 192.168.56.20 9300 1.0.0.Beta2 1.6.0_27 72.2gb 74.5 93.9mb 83 239.1mb 0.12 3.4h d m Zarek +-------------------------------------------------- + +The first few columns tell you where your nodes live. For sanity it +also tells you what version of ES and the JVM each one runs. + +[source,shell] +-------------------------------------------------- +nodeId pid ip port es jdk +u2PZ 4234 192.168.56.30 9300 1.0.0.Beta1 1.6.0_27 +URzf 5443 192.168.56.10 9300 1.0.0.Beta1 1.6.0_27 +ActN 3806 192.168.56.20 9300 1.0.0.Beta1 1.6.0_27 +-------------------------------------------------- + + +The next few give a picture of your heap, memory, and load. + +[source,shell] +-------------------------------------------------- +diskAvail heapPercent heapMax ramPercent ramMax load + 72.1gb 31.3 93.9mb 81 239.1mb 0.24 + 72.1gb 19.6 93.9mb 82 239.1mb 0.05 + 72.2gb 64.9 93.9mb 84 239.1mb 0.12 +-------------------------------------------------- + +The last columns provide ancillary information that can often be +useful when looking at the cluster as a whole, particularly large +ones. How many master-eligible nodes do I have? How many client +nodes? It looks like someone restarted a node recently; which one was +it? + +[source,shell] +-------------------------------------------------- +uptime data/client master name + 3.5h d m Boneyard + 3.5h d * Athena + 3.5h d m Zarek +-------------------------------------------------- diff --git a/docs/reference/cat/pending_tasks.asciidoc b/docs/reference/cat/pending_tasks.asciidoc new file mode 100644 index 0000000..62f90b6 --- /dev/null +++ b/docs/reference/cat/pending_tasks.asciidoc @@ -0,0 +1,19 @@ +[[cat-pending-tasks]] +== Cluster Pending Tasks + +`pending_tasks` provides the same information as the +<<cluster-pending,`/_cluster/pending_tasks`>> API in a +convenient tabular format. + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/pending_tasks?v' +insertOrder timeInQueue priority source + 1685 855ms HIGH update-mapping [foo][t] + 1686 843ms HIGH update-mapping [foo][t] + 1693 753ms HIGH refresh-mapping [foo][[t]] + 1688 816ms HIGH update-mapping [foo][t] + 1689 802ms HIGH update-mapping [foo][t] + 1690 787ms HIGH update-mapping [foo][t] + 1691 773ms HIGH update-mapping [foo][t] +-------------------------------------------------- diff --git a/docs/reference/cat/recovery.asciidoc b/docs/reference/cat/recovery.asciidoc new file mode 100644 index 0000000..ae6b5de --- /dev/null +++ b/docs/reference/cat/recovery.asciidoc @@ -0,0 +1,57 @@ +[[cat-recovery]] +== Recovery + +`recovery` is a view of shard replication. It will show information +anytime data from at least one shard is copying to a different node. +It can also show up on cluster restarts. If your recovery process +seems stuck, try it to see if there's any movement. + +As an example, let's enable replicas on a cluster which has two +indices, three shards each. Afterward we'll have twelve total shards, +but before those replica shards are `STARTED`, we'll take a snapshot +of the recovery: + +[source,shell] +-------------------------------------------------- +% curl -XPUT 192.168.56.30:9200/_settings -d'{"number_of_replicas":1}' +{"acknowledged":true} +% curl '192.168.56.30:9200/_cat/recovery?v' +index shard target recovered % ip node +wiki1 2 68083830 7865837 11.6% 192.168.56.20 Adam II +wiki2 1 2542400 444175 17.5% 192.168.56.20 Adam II +wiki2 2 3242108 329039 10.1% 192.168.56.10 Jarella +wiki2 0 2614132 0 0.0% 192.168.56.30 Solarr +wiki1 0 60992898 4719290 7.7% 192.168.56.30 Solarr +wiki1 1 47630362 6798313 14.3% 192.168.56.10 Jarella +-------------------------------------------------- + +We have six total shards in recovery (a replica for each primary), at +varying points of progress. + +Let's restart the cluster and then lose a node. This output shows us +what was moving around shortly after the node left the cluster. + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.30:9200/_cat/health; curl 192.168.56.30:9200/_cat/recovery +1384315040 19:57:20 foo yellow 2 2 8 6 0 4 0 +wiki2 2 1621477 0 0.0% 192.168.56.30 Garrett, Jonathan "John" +wiki2 0 1307488 0 0.0% 192.168.56.20 Commander Kraken +wiki1 0 32696794 20984240 64.2% 192.168.56.20 Commander Kraken +wiki1 1 31123128 21951695 70.5% 192.168.56.30 Garrett, Jonathan "John" +-------------------------------------------------- + +[float] +[[big-percent]] +=== Why am I seeing recovery percentages greater than 100? + +This can happen if a shard copy goes away and comes back while the +primary was indexing. The replica shard will catch up with the +primary by receiving any new segments created during its outage. +These new segments can contain data from segments it already has +because they're the result of merging that happened on the primary, +but now live in different, larger segments. After the new segments +are copied over the replica will delete unneeded segments, resulting +in a dataset that more closely matches the primary (or exactly, +assuming indexing isn't still happening). + diff --git a/docs/reference/cat/shards.asciidoc b/docs/reference/cat/shards.asciidoc new file mode 100644 index 0000000..bb91027 --- /dev/null +++ b/docs/reference/cat/shards.asciidoc @@ -0,0 +1,90 @@ +[[cat-shards]] +== Shards + +The `shards` command is the detailed view of what nodes contain which +shards. It will tell you if it's a primary or replica, the number of +docs, the bytes it takes on disk, and the node where it's located. + +Here we see a single index, with three primary shards and no replicas: + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.20:9200/_cat/shards +wiki1 0 p STARTED 3014 31.1mb 192.168.56.10 Stiletto +wiki1 1 p STARTED 3013 29.6mb 192.168.56.30 Frankie Raye +wiki1 2 p STARTED 3973 38.1mb 192.168.56.20 Commander Kraken +-------------------------------------------------- + +[[index-pattern]] +=== Index pattern + +If you have many shards, you may wish to limit which indices show up +in the output. You can always do this with `grep`, but you can save +some bandwidth by supplying an index pattern to the end. + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.20:9200/_cat/shards/wiki2 +wiki2 0 p STARTED 197 3.2mb 192.168.56.10 Stiletto +wiki2 1 p STARTED 205 5.9mb 192.168.56.30 Frankie Raye +wiki2 2 p STARTED 275 7.8mb 192.168.56.20 Commander Kraken +-------------------------------------------------- + + +[[relocation]] +=== Relocation + +Let's say you've checked your health and you see two relocating +shards. Where are they from and where are they going? + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.10:9200/_cat/health +1384315316 20:01:56 foo green 3 3 12 6 2 0 0 +% curl 192.168.56.10:9200/_cat/shards | fgrep RELO +wiki1 0 r RELOCATING 3014 31.1mb 192.168.56.20 Commander Kraken -> 192.168.56.30 Frankie Raye +wiki1 1 r RELOCATING 3013 29.6mb 192.168.56.10 Stiletto -> 192.168.56.30 Frankie Raye +-------------------------------------------------- + +[[states]] +=== Shard states + +Before a shard can be used, it goes through an `INITIALIZING` state. +`shards` can show you which ones. + +[source,shell] +-------------------------------------------------- +% curl -XPUT 192.168.56.20:9200/_settings -d'{"number_of_replicas":1}' +{"acknowledged":true} +% curl 192.168.56.20:9200/_cat/shards +wiki1 0 p STARTED 3014 31.1mb 192.168.56.10 Stiletto +wiki1 0 r INITIALIZING 0 14.3mb 192.168.56.30 Frankie Raye +wiki1 1 p STARTED 3013 29.6mb 192.168.56.30 Frankie Raye +wiki1 1 r INITIALIZING 0 13.1mb 192.168.56.20 Commander Kraken +wiki1 2 r INITIALIZING 0 14mb 192.168.56.10 Stiletto +wiki1 2 p STARTED 3973 38.1mb 192.168.56.20 Commander Kraken +-------------------------------------------------- + +If a shard cannot be assigned, for example you've overallocated the +number of replicas for the number of nodes in the cluster, they will +remain `UNASSIGNED`. + +[source,shell] +-------------------------------------------------- +% curl -XPUT 192.168.56.20:9200/_settings -d'{"number_of_replicas":3}' +% curl 192.168.56.20:9200/_cat/health +1384316325 20:18:45 foo yellow 3 3 9 3 0 0 3 +% curl 192.168.56.20:9200/_cat/shards +wiki1 0 p STARTED 3014 31.1mb 192.168.56.10 Stiletto +wiki1 0 r STARTED 3014 31.1mb 192.168.56.30 Frankie Raye +wiki1 0 r STARTED 3014 31.1mb 192.168.56.20 Commander Kraken +wiki1 0 r UNASSIGNED +wiki1 1 r STARTED 3013 29.6mb 192.168.56.10 Stiletto +wiki1 1 p STARTED 3013 29.6mb 192.168.56.30 Frankie Raye +wiki1 1 r STARTED 3013 29.6mb 192.168.56.20 Commander Kraken +wiki1 1 r UNASSIGNED +wiki1 2 r STARTED 3973 38.1mb 192.168.56.10 Stiletto +wiki1 2 r STARTED 3973 38.1mb 192.168.56.30 Frankie Raye +wiki1 2 p STARTED 3973 38.1mb 192.168.56.20 Commander Kraken +wiki1 2 r UNASSIGNED +-------------------------------------------------- diff --git a/docs/reference/cat/thread_pool.asciidoc b/docs/reference/cat/thread_pool.asciidoc new file mode 100644 index 0000000..5ed0a15 --- /dev/null +++ b/docs/reference/cat/thread_pool.asciidoc @@ -0,0 +1,44 @@ +[[cat-thread-pool]] +== Thread pool + +The `thread_pool` command shows cluster wide thread pool statistics per node. By default the active, queue and rejected +statistics are returned for the bulk, index and search thread pools. + +[source,shell] +-------------------------------------------------- +% curl 192.168.56.10:9200/_cat/thread_pool +host1 192.168.1.35 0 0 0 0 0 0 0 0 0 +host2 192.168.1.36 0 0 0 0 0 0 0 0 0 +-------------------------------------------------- + +The first two columns contain the host and ip of a node. + +[source,shell] +-------------------------------------------------- +host ip +host1 192.168.1.35 +host2 192.168.1.36 +-------------------------------------------------- + +The next three columns show the active queue and rejected statistics for the bulk thread pool. + +[source,shell] +-------------------------------------------------- +bulk.active bulk.queue bulk.rejected + 0 0 0 +-------------------------------------------------- + +The remaining columns show the active queue and rejected statistics of the index and search thread pool respectively. + +Also other statistics of different thread pools can be retrieved by using the `h` (header) parameter. + +[source,shell] +-------------------------------------------------- +% curl 'localhost:9200/_cat/thread_pool?v&h=id,host,suggest.active,suggest.rejected,suggest.completed' +host suggest.active suggest.rejected suggest.completed +host1 0 0 0 +host2 0 0 0 +-------------------------------------------------- + +Here the host columns and the active, rejected and completed suggest thread pool statistic are displayed. The suggest +thread pool won't be displayed by default, so you always need be specific about what statistic you want to display.
\ No newline at end of file diff --git a/docs/reference/cluster.asciidoc b/docs/reference/cluster.asciidoc new file mode 100644 index 0000000..088de8d --- /dev/null +++ b/docs/reference/cluster.asciidoc @@ -0,0 +1,50 @@ +[[cluster]] += Cluster APIs + +[partintro] +-- +["float",id="cluster-nodes"] +== Node specification + +Most cluster level APIs allow to specify which nodes to execute on (for +example, getting the node stats for a node). Nodes can be identified in +the APIs either using their internal node id, the node name, address, +custom attributes, or just the `_local` node receiving the request. For +example, here are some sample executions of nodes info: + +[source,js] +-------------------------------------------------- +# Local +curl localhost:9200/_nodes/_local +# Address +curl localhost:9200/_nodes/10.0.0.3,10.0.0.4 +curl localhost:9200/_nodes/10.0.0.* +# Names +curl localhost:9200/_nodes/node_name_goes_here +curl localhost:9200/_nodes/node_name_goes_* +# Attributes (set something like node.rack: 2 in the config) +curl localhost:9200/_nodes/rack:2 +curl localhost:9200/_nodes/ra*:2 +curl localhost:9200/_nodes/ra*:2* +-------------------------------------------------- +-- + +include::cluster/health.asciidoc[] + +include::cluster/state.asciidoc[] + +include::cluster/stats.asciidoc[] + +include::cluster/pending.asciidoc[] + +include::cluster/reroute.asciidoc[] + +include::cluster/update-settings.asciidoc[] + +include::cluster/nodes-stats.asciidoc[] + +include::cluster/nodes-info.asciidoc[] + +include::cluster/nodes-hot-threads.asciidoc[] + +include::cluster/nodes-shutdown.asciidoc[] diff --git a/docs/reference/cluster/health.asciidoc b/docs/reference/cluster/health.asciidoc new file mode 100644 index 0000000..48108e1 --- /dev/null +++ b/docs/reference/cluster/health.asciidoc @@ -0,0 +1,87 @@ +[[cluster-health]] +== Cluster Health + +The cluster health API allows to get a very simple status on the health +of the cluster. + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_cluster/health?pretty=true' +{ + "cluster_name" : "testcluster", + "status" : "green", + "timed_out" : false, + "number_of_nodes" : 2, + "number_of_data_nodes" : 2, + "active_primary_shards" : 5, + "active_shards" : 10, + "relocating_shards" : 0, + "initializing_shards" : 0, + "unassigned_shards" : 0 +} +-------------------------------------------------- + +The API can also be executed against one or more indices to get just the +specified indices health: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_cluster/health/test1,test2' +-------------------------------------------------- + +The cluster health status is: `green`, `yellow` or `red`. On the shard +level, a `red` status indicates that the specific shard is not allocated +in the cluster, `yellow` means that the primary shard is allocated but +replicas are not, and `green` means that all shards are allocated. The +index level status is controlled by the worst shard status. The cluster +status is controlled by the worst index status. + +One of the main benefits of the API is the ability to wait until the +cluster reaches a certain high water-mark health level. For example, the +following will wait for 50 seconds for the cluster to reach the `yellow` +level (if it reaches the `green` or `yellow` status before 50 seconds elapse, +it will return at that point): + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_cluster/health?wait_for_status=yellow&timeout=50s' +-------------------------------------------------- + +[float] +[[request-params]] +=== Request Parameters + +The cluster health API accepts the following request parameters: + +`level`:: + Can be one of `cluster`, `indices` or `shards`. Controls the + details level of the health information returned. Defaults to `cluster`. + +`wait_for_status`:: + One of `green`, `yellow` or `red`. Will wait (until + the timeout provided) until the status of the cluster changes to the one + provided. By default, will not wait for any status. + +`wait_for_relocating_shards`:: + A number controlling to how many relocating + shards to wait for. Usually will be `0` to indicate to wait till all + relocation have happened. Defaults to not to wait. + +`wait_for_nodes`:: + The request waits until the specified number `N` of + nodes is available. It also accepts `>=N`, `<=N`, `>N` and `<N`. + Alternatively, it is possible to use `ge(N)`, `le(N)`, `gt(N)` and + `lt(N)` notation. + +`timeout`:: + A time based parameter controlling how long to wait if one of + the wait_for_XXX are provided. Defaults to `30s`. + + +The following is an example of getting the cluster health at the +`shards` level: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_cluster/health/twitter?level=shards' +-------------------------------------------------- diff --git a/docs/reference/cluster/nodes-hot-threads.asciidoc b/docs/reference/cluster/nodes-hot-threads.asciidoc new file mode 100644 index 0000000..dc8b153 --- /dev/null +++ b/docs/reference/cluster/nodes-hot-threads.asciidoc @@ -0,0 +1,16 @@ +[[cluster-nodes-hot-threads]] +== Nodes hot_threads + +An API allowing to get the current hot threads on each node in the +cluster. Endpoints are `/_nodes/hot_threads`, and +`/_nodes/{nodesIds}/hot_threads`. + +The output is plain text with a breakdown of each node's top hot +threads. Parameters allowed are: + +[horizontal] +`threads`:: number of hot threads to provide, defaults to 3. +`interval`:: the interval to do the second sampling of threads. + Defaults to 500ms. +`type`:: The type to sample, defaults to cpu, but supports wait and + block to see hot threads that are in wait or block state. diff --git a/docs/reference/cluster/nodes-info.asciidoc b/docs/reference/cluster/nodes-info.asciidoc new file mode 100644 index 0000000..96b5fb5 --- /dev/null +++ b/docs/reference/cluster/nodes-info.asciidoc @@ -0,0 +1,93 @@ +[[cluster-nodes-info]] +== Nodes Info + +The cluster nodes info API allows to retrieve one or more (or all) of +the cluster nodes information. + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/_nodes' +curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2' +-------------------------------------------------- + +The first command retrieves information of all the nodes in the cluster. +The second command selectively retrieves nodes information of only +`nodeId1` and `nodeId2`. All the nodes selective options are explained +<<cluster-nodes,here>>. + +By default, it just returns all attributes and core settings for a node. +It also allows to get only information on `settings`, `os`, `process`, `jvm`, +`thread_pool`, `network`, `transport`, `http` and `plugin`: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/_nodes/process' +curl -XGET 'http://localhost:9200/_nodes/_all/process' +curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/jvm,process' +# same as above +curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/info/jvm,process' + +curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/_all +-------------------------------------------------- + +The `all` flag can be set to return all the information - or you can simply omit it. + +`plugin` - if set, the result will contain details about the loaded +plugins per node: + +* `name`: plugin name +* `description`: plugin description if any +* `site`: `true` if the plugin is a site plugin +* `jvm`: `true` if the plugin is a plugin running in the JVM +* `url`: URL if the plugin is a site plugin + +The result will look similar to: + +[source,js] +-------------------------------------------------- +{ + "cluster_name" : "test-cluster-MacBook-Air-de-David.local", + "nodes" : { + "hJLXmY_NTrCytiIMbX4_1g" : { + "name" : "node4", + "transport_address" : "inet[/172.18.58.139:9303]", + "hostname" : "MacBook-Air-de-David.local", + "version" : "0.90.0.Beta2-SNAPSHOT", + "http_address" : "inet[/172.18.58.139:9203]", + "plugins" : [ { + "name" : "test-plugin", + "description" : "test-plugin description", + "site" : true, + "jvm" : false + }, { + "name" : "test-no-version-plugin", + "description" : "test-no-version-plugin description", + "site" : true, + "jvm" : false + }, { + "name" : "dummy", + "description" : "No description found for dummy.", + "url" : "/_plugin/dummy/", + "site" : false, + "jvm" : true + } ] + } + } +} +-------------------------------------------------- + +if your `plugin` data is subject to change use +`plugins.info_refresh_interval` to change or disable the caching +interval: + +[source,js] +-------------------------------------------------- +# Change cache to 20 seconds +plugins.info_refresh_interval: 20s + +# Infinite cache +plugins.info_refresh_interval: -1 + +# Disable cache +plugins.info_refresh_interval: 0 +-------------------------------------------------- diff --git a/docs/reference/cluster/nodes-shutdown.asciidoc b/docs/reference/cluster/nodes-shutdown.asciidoc new file mode 100644 index 0000000..65030a3 --- /dev/null +++ b/docs/reference/cluster/nodes-shutdown.asciidoc @@ -0,0 +1,57 @@ +[[cluster-nodes-shutdown]] +== Nodes Shutdown + +The nodes shutdown API allows to shutdown one or more (or all) nodes in +the cluster. Here is an example of shutting the `_local` node the +request is directed to: + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/_cluster/nodes/_local/_shutdown' +-------------------------------------------------- + +Specific node(s) can be shutdown as well using their respective node ids +(or other selective options as explained +<<cluster-nodes,here>> .): + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/_cluster/nodes/nodeId1,nodeId2/_shutdown' +-------------------------------------------------- + +The master (of the cluster) can also be shutdown using: + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/_cluster/nodes/_master/_shutdown' +-------------------------------------------------- + +Finally, all nodes can be shutdown using one of the options below: + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/_shutdown' + +$ curl -XPOST 'http://localhost:9200/_cluster/nodes/_shutdown' + +$ curl -XPOST 'http://localhost:9200/_cluster/nodes/_all/_shutdown' +-------------------------------------------------- + +[float] +[[delay]] +=== Delay + +By default, the shutdown will be executed after a 1 second delay (`1s`). +The delay can be customized by setting the `delay` parameter in a time +value format. For example: + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/_cluster/nodes/_local/_shutdown?delay=10s' +-------------------------------------------------- + +[float] +=== Disable Shutdown + +The shutdown API can be disabled by setting `action.disable_shutdown` in +the node configuration. diff --git a/docs/reference/cluster/nodes-stats.asciidoc b/docs/reference/cluster/nodes-stats.asciidoc new file mode 100644 index 0000000..82d7b38 --- /dev/null +++ b/docs/reference/cluster/nodes-stats.asciidoc @@ -0,0 +1,97 @@ +[[cluster-nodes-stats]] +== Nodes Stats + +[float] +=== Nodes statistics + +The cluster nodes stats API allows to retrieve one or more (or all) of +the cluster nodes statistics. + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/_nodes/stats' +curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/stats' +-------------------------------------------------- + +The first command retrieves stats of all the nodes in the cluster. The +second command selectively retrieves nodes stats of only `nodeId1` and +`nodeId2`. All the nodes selective options are explained +<<cluster-nodes,here>>. + +By default, all stats are returned. You can limit this by combining any +of `indices`, `os`, `process`, `jvm`, `network`, `transport`, `http`, +`fs`, `breaker` and `thread_pool`. For example: + +[horizontal] +`indices`:: + Indices stats about size, document count, indexing and + deletion times, search times, field cache size , merges and flushes + +`fs`:: + File system information, data path, free disk space, read/write + stats + +`http`:: + HTTP connection information + +`jvm`:: + JVM stats, memory pool information, garbage collection, buffer + pools + +`network`:: + TCP information + +`os`:: + Operating system stats, load average, cpu, mem, swap + +`process`:: + Process statistics, memory consumption, cpu usage, open + file descriptors + +`thread_pool`:: + Statistics about each thread pool, including current + size, queue and rejected tasks + +`transport`:: + Transport statistics about sent and received bytes in + cluster communication + +`breaker`:: + Statistics about the field data circuit breaker + +`clear`:: + Clears all the flags (first). Useful, if you only want to + retrieve specific stats. + +[source,js] +-------------------------------------------------- +# return indices and os +curl -XGET 'http://localhost:9200/_nodes/stats/os' +# return just os and process +curl -XGET 'http://localhost:9200/_nodes/stats/os,process' +# specific type endpoint +curl -XGET 'http://localhost:9200/_nodes/stats/process' +curl -XGET 'http://localhost:9200/_nodes/10.0.0.1/stats/process' +-------------------------------------------------- + +The `all` flag can be set to return all the stats. + +[float] +[[field-data]] +=== Field data statistics + +You can get information about field data memory usage on node +level or on index level. + +[source,js] +-------------------------------------------------- +# Node Stats +curl localhost:9200/_nodes/stats/indices/field1,field2?pretty + +# Indices Stat +curl localhost:9200/_stats/fielddata/field1,field2?pretty + +# You can use wildcards for field names +curl localhost:9200/_stats/fielddata/field*?pretty +curl localhost:9200/_nodes/stats/indices/field*?pretty +-------------------------------------------------- diff --git a/docs/reference/cluster/pending.asciidoc b/docs/reference/cluster/pending.asciidoc new file mode 100644 index 0000000..0e018e4 --- /dev/null +++ b/docs/reference/cluster/pending.asciidoc @@ -0,0 +1,44 @@ +[[cluster-pending]] +== Pending cluster tasks + +The pending cluster tasks API returns a list of any cluster-level changes +(e.g. create index, update mapping, allocate or fail shard) which have not yet +been executed. + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_cluster/pending_tasks' +-------------------------------------------------- + +Usually this will return an empty list as cluster-level changes are usually +fast. However if there are tasks queued up, the output will look something +like this: + +[source,js] +-------------------------------------------------- +{ + "tasks": [ + { + "insert_order": 101, + "priority": "URGENT", + "source": "create-index [foo_9], cause [api]", + "time_in_queue_millis": 86, + "time_in_queue": "86ms" + }, + { + "insert_order": 46, + "priority": "HIGH", + "source": "shard-started ([foo_2][1], node[tMTocMvQQgGCkj7QDHl3OA], [P], s[INITIALIZING]), reason [after recovery from gateway]", + "time_in_queue_millis": 842, + "time_in_queue": "842ms" + }, + { + "insert_order": 45, + "priority": "HIGH", + "source": "shard-started ([foo_2][0], node[tMTocMvQQgGCkj7QDHl3OA], [P], s[INITIALIZING]), reason [after recovery from gateway]", + "time_in_queue_millis": 858, + "time_in_queue": "858ms" + } + ] +} +-------------------------------------------------- diff --git a/docs/reference/cluster/reroute.asciidoc b/docs/reference/cluster/reroute.asciidoc new file mode 100644 index 0000000..8348edb --- /dev/null +++ b/docs/reference/cluster/reroute.asciidoc @@ -0,0 +1,68 @@ +[[cluster-reroute]] +== Cluster Reroute + +The reroute command allows to explicitly execute a cluster reroute +allocation command including specific commands. For example, a shard can +be moved from one node to another explicitly, an allocation can be +canceled, or an unassigned shard can be explicitly allocated on a +specific node. + +Here is a short example of how a simple reroute API call: + +[source,js] +-------------------------------------------------- + +curl -XPOST 'localhost:9200/_cluster/reroute' -d '{ + "commands" : [ { + "move" : + { + "index" : "test", "shard" : 0, + "from_node" : "node1", "to_node" : "node2" + } + }, + { + "allocate" : { + "index" : "test", "shard" : 1, "node" : "node3" + } + } + ] +}' +-------------------------------------------------- + +An important aspect to remember is the fact that once when an allocation +occurs, the cluster will aim at re-balancing its state back to an even +state. For example, if the allocation includes moving a shard from +`node1` to `node2`, in an `even` state, then another shard will be moved +from `node2` to `node1` to even things out. + +The cluster can be set to disable allocations, which means that only the +explicitly allocations will be performed. Obviously, only once all +commands has been applied, the cluster will aim to be re-balance its +state. + +Another option is to run the commands in `dry_run` (as a URI flag, or in +the request body). This will cause the commands to apply to the current +cluster state, and return the resulting cluster after the commands (and +re-balancing) has been applied. + +The commands supported are: + +`move`:: + Move a started shard from one node to another node. Accepts + `index` and `shard` for index name and shard number, `from_node` for the + node to move the shard `from`, and `to_node` for the node to move the + shard to. + +`cancel`:: + Cancel allocation of a shard (or recovery). Accepts `index` + and `shard` for index name and shard number, and `node` for the node to + cancel the shard allocation on. It also accepts `allow_primary` flag to + explicitly specify that it is allowed to cancel allocation for a primary + shard. + +`allocate`:: + Allocate an unassigned shard to a node. Accepts the + `index` and `shard` for index name and shard number, and `node` to + allocate the shard to. It also accepts `allow_primary` flag to + explicitly specify that it is allowed to explicitly allocate a primary + shard (might result in data loss). diff --git a/docs/reference/cluster/state.asciidoc b/docs/reference/cluster/state.asciidoc new file mode 100644 index 0000000..3a18be2 --- /dev/null +++ b/docs/reference/cluster/state.asciidoc @@ -0,0 +1,67 @@ +[[cluster-state]] +== Cluster State + +The cluster state API allows to get a comprehensive state information of +the whole cluster. + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_cluster/state' +-------------------------------------------------- + +By default, the cluster state request is routed to the master node, to +ensure that the latest cluster state is returned. +For debugging purposes, you can retrieve the cluster state local to a +particular node by adding `local=true` to the query string. + +[float] +=== Response Filters + +As the cluster state can grow (depending on the number of shards and indices, your mapping, templates), +it is possible to filter the cluster state response specifying the parts in the URL. + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_cluster/state/{metrics}/{indices}' +-------------------------------------------------- + +`metrics` can be a comma-separated list of + +`version`:: + Shows the cluster state version. + +`master_node`:: + Shows the elected `master_node` part of the response + +`nodes`:: + Shows the `nodes` part of the response + +`routing_table`:: + Shows the `routing_table` part of the response. If you supply a comma separated list of indices, the returned output will only contain the indices listed. + +`metadata`:: + Shows the `metadata` part of the response. If you supply a comma separated list of indices, the returned output will only contain the indices listed. + +`blocks`:: + Shows the `blocks` part of the response + +In addition the `index_templates` parameter can be specified, which returns the specified index templates only. This works only if the `metadata` is asked to be returned. + +A couple of example calls: + +[source,js] +-------------------------------------------------- +# return only metadata and routing_table data for specified indices +$ curl -XGET 'http://localhost:9200/_cluster/state/metadata,routing_table/foo,bar' + +# return everything for these two indices +$ curl -XGET 'http://localhost:9200/_cluster/state/_all/foo,bar' + +# Return only blocks data +$ curl -XGET 'http://localhost:9200/_cluster/state/blocks' + +# Return only metadata and a specific index_template +# You should use the dedicated template endpoint for this +$ curl -XGET 'http://localhost:9200/_cluster/state/metadata?index_templates=template_1' +-------------------------------------------------- + diff --git a/docs/reference/cluster/stats.asciidoc b/docs/reference/cluster/stats.asciidoc new file mode 100644 index 0000000..43c3f7a --- /dev/null +++ b/docs/reference/cluster/stats.asciidoc @@ -0,0 +1,168 @@ +[[cluster-stats]] +== Cluster Stats + +The Cluster Stats API allows to retrieve statistics from a cluster wide perspective. +The API returns basic index metrics (shard numbers, store size, memory usage) and +information about the current nodes that form the cluster (number, roles, os, jvm +versions, memory usage, cpu and installed plugins). + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/_cluster/stats?human' +-------------------------------------------------- + +Will return, for example: +[source,js] +-------------------------------------------------- +{ + "cluster_name": "elasticsearch", + "status": "green", + "indices": { + "count": 3, + "shards": { + "total": 35, + "primaries": 15, + "replication": 1.333333333333333, + "index": { + "shards": { + "min": 10, + "max": 15, + "avg": 11.66666666666666 + }, + "primaries": { + "min": 5, + "max": 5, + "avg": 5 + }, + "replication": { + "min": 1, + "max": 2, + "avg": 1.3333333333333333 + } + } + }, + "docs": { + "count": 2, + "deleted": 0 + }, + "store": { + "size": "5.6kb", + "size_in_bytes": 5770, + "throttle_time": "0s", + "throttle_time_in_millis": 0 + }, + "fielddata": { + "memory_size": "0b", + "memory_size_in_bytes": 0, + "evictions": 0 + }, + "filter_cache": { + "memory_size": "0b", + "memory_size_in_bytes": 0, + "evictions": 0 + }, + "id_cache": { + "memory_size": "0b", + "memory_size_in_bytes": 0 + }, + "completion": { + "size": "0b", + "size_in_bytes": 0 + }, + "segments": { + "count": 2 + } + }, + "nodes": { + "count": { + "total": 2, + "master_only": 0, + "data_only": 0, + "master_data": 2, + "client": 0 + }, + "versions": [ + "0.90.8" + ], + "os": { + "available_processors": 4, + "mem": { + "total": "8gb", + "total_in_bytes": 8589934592 + }, + "cpu": [ + { + "vendor": "Intel", + "model": "MacBookAir5,2", + "mhz": 2000, + "total_cores": 4, + "total_sockets": 4, + "cores_per_socket": 16, + "cache_size": "256b", + "cache_size_in_bytes": 256, + "count": 1 + } + ] + }, + "process": { + "cpu": { + "percent": 3 + }, + "open_file_descriptors": { + "min": 200, + "max": 346, + "avg": 273 + } + }, + "jvm": { + "max_uptime": "24s", + "max_uptime_in_millis": 24054, + "version": [ + { + "version": "1.6.0_45", + "vm_name": "Java HotSpot(TM) 64-Bit Server VM", + "vm_version": "20.45-b01-451", + "vm_vendor": "Apple Inc.", + "count": 2 + } + ], + "mem": { + "heap_used": "38.3mb", + "heap_used_in_bytes": 40237120, + "heap_max": "1.9gb", + "heap_max_in_bytes": 2130051072 + }, + "threads": 89 + }, + "fs": + { + "total": "232.9gb", + "total_in_bytes": 250140434432, + "free": "31.3gb", + "free_in_bytes": 33705881600, + "available": "31.1gb", + "available_in_bytes": 33443737600, + "disk_reads": 21202753, + "disk_writes": 27028840, + "disk_io_op": 48231593, + "disk_read_size": "528gb", + "disk_read_size_in_bytes": 566980806656, + "disk_write_size": "617.9gb", + "disk_write_size_in_bytes": 663525366784, + "disk_io_size": "1145.9gb", + "disk_io_size_in_bytes": 1230506173440 + }, + "plugins": [ + // all plugins installed on nodes + { + "name": "inquisitor", + "description": "", + "url": "/_plugin/inquisitor/", + "jvm": false, + "site": true + } + ] + } +} +-------------------------------------------------- + diff --git a/docs/reference/cluster/update-settings.asciidoc b/docs/reference/cluster/update-settings.asciidoc new file mode 100644 index 0000000..4e60868 --- /dev/null +++ b/docs/reference/cluster/update-settings.asciidoc @@ -0,0 +1,209 @@ +[[cluster-update-settings]] +== Cluster Update Settings + +Allows to update cluster wide specific settings. Settings updated can +either be persistent (applied cross restarts) or transient (will not +survive a full cluster restart). Here is an example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_cluster/settings -d '{ + "persistent" : { + "discovery.zen.minimum_master_nodes" : 2 + } +}' +-------------------------------------------------- + +Or: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_cluster/settings -d '{ + "transient" : { + "discovery.zen.minimum_master_nodes" : 2 + } +}' +-------------------------------------------------- + +The cluster responds with the settings updated. So the response for the +last example will be: + +[source,js] +-------------------------------------------------- +{ + "persistent" : {}, + "transient" : { + "discovery.zen.minimum_master_nodes" : "2" + } +}' +-------------------------------------------------- + +Cluster wide settings can be returned using: + +[source,js] +-------------------------------------------------- +curl -XGET localhost:9200/_cluster/settings +-------------------------------------------------- + +There is a specific list of settings that can be updated, those include: + +[float] +[[cluster-settings]] +=== Cluster settings + +[float] +==== Routing allocation + +[float] +===== Awareness + +`cluster.routing.allocation.awareness.attributes`:: + See <<modules-cluster>>. + +`cluster.routing.allocation.awareness.force.*`:: + See <<modules-cluster>>. + +[float] +===== Balanced Shards + +`cluster.routing.allocation.balance.shard`:: + Defines the weight factor for shards allocated on a node + (float). Defaults to `0.45f`. + +`cluster.routing.allocation.balance.index`:: + Defines a factor to the number of shards per index allocated + on a specific node (float). Defaults to `0.5f`. + +`cluster.routing.allocation.balance.primary`:: + defines a weight factor for the number of primaries of a specific index + allocated on a node (float). `0.05f`. + +`cluster.routing.allocation.balance.threshold`:: + minimal optimization value of operations that should be performed (non + negative float). Defaults to `1.0f`. + +[float] +===== Concurrent Rebalance + +`cluster.routing.allocation.cluster_concurrent_rebalance`:: + Allow to control how many concurrent rebalancing of shards are + allowed cluster wide, and default it to `2` (integer). `-1` for + unlimited. See also <<modules-cluster>>. + +[float] +===== Disable allocation + +added[1.0.0.RC1] + +All the disable allocation settings have been deprecated in favour for +`cluster.routing.allocation.enable` setting. + +`cluster.routing.allocation.disable_allocation`:: + See <<modules-cluster>>. + +`cluster.routing.allocation.disable_replica_allocation`:: + See <<modules-cluster>>. + +`cluster.routing.allocation.disable_new_allocation`:: + See <<modules-cluster>>. + +[float] +===== Enable allocation + +`cluster.routing.allocation.enable`:: + See <<modules-cluster>>. + +[float] +===== Throttling allocation + +`cluster.routing.allocation.node_initial_primaries_recoveries`:: + See <<modules-cluster>>. + +`cluster.routing.allocation.node_concurrent_recoveries`:: + See <<modules-cluster>>. + +[float] +===== Filter allocation + +`cluster.routing.allocation.include.*`:: + See <<modules-cluster>>. + +`cluster.routing.allocation.exclude.*`:: + See <<modules-cluster>>. + +`cluster.routing.allocation.require.*` + See <<modules-cluster>>. + +[float] +==== Metadata + +`cluster.blocks.read_only`:: + Have the whole cluster read only (indices do not accept write operations), metadata is not allowed to be modified (create or delete indices). + +[float] +==== Discovery + +`discovery.zen.minimum_master_nodes`:: + See <<modules-discovery-zen>> + +[float] +==== Threadpools + +`threadpool.*`:: + See <<modules-threadpool>> + +[float] +[[cluster-index-settings]] +=== Index settings + +[float] +==== Index filter cache + +`indices.cache.filter.size`:: + See <<index-modules-cache>> + +`indices.cache.filter.expire` (time):: + See <<index-modules-cache>> + +[float] +==== TTL interval + +`indices.ttl.interval` (time):: + See <<mapping-ttl-field>> + +[float] +==== Recovery + +`indices.recovery.concurrent_streams`:: + See <<modules-indices>> + +`indices.recovery.file_chunk_size`:: + See <<modules-indices>> + +`indices.recovery.translog_ops`:: + See <<modules-indices>> + +`indices.recovery.translog_size`:: + See <<modules-indices>> + +`indices.recovery.compress`:: + See <<modules-indices>> + +`indices.recovery.max_bytes_per_sec`:: + See <<modules-indices>> + +[float] +==== Store level throttling + +`indices.store.throttle.type`:: + See <<index-modules-store>> + +`indices.store.throttle.max_bytes_per_sec`:: + See <<index-modules-store>> + +[float] +[[logger]] +=== Logger + +Logger values can also be updated by setting `logger.` prefix. More +settings will be allowed to be updated. diff --git a/docs/reference/docs.asciidoc b/docs/reference/docs.asciidoc new file mode 100644 index 0000000..469bc19 --- /dev/null +++ b/docs/reference/docs.asciidoc @@ -0,0 +1,44 @@ +[[docs]] += Document APIs + +[partintro] +-- + +This section describes the following CRUD APIs: + +.Single document APIs +* <<docs-index_>> +* <<docs-get>> +* <<docs-delete>> +* <<docs-update>> + +.Multi-document APIs +* <<docs-multi-get>> +* <<docs-bulk>> +* <<docs-bulk-udp>> +* <<docs-delete-by-query>> + +NOTE: All CRUD APIs are single-index APIs. The `index` parameter accepts a single +index name, or an `alias` which points to a single index. + +-- + +include::docs/index_.asciidoc[] + +include::docs/get.asciidoc[] + +include::docs/delete.asciidoc[] + +include::docs/update.asciidoc[] + +include::docs/multi-get.asciidoc[] + +include::docs/bulk.asciidoc[] + +include::docs/delete-by-query.asciidoc[] + +include::docs/bulk-udp.asciidoc[] + +include::docs/termvectors.asciidoc[] + +include::docs/multi-termvectors.asciidoc[] diff --git a/docs/reference/docs/bulk-udp.asciidoc b/docs/reference/docs/bulk-udp.asciidoc new file mode 100644 index 0000000..74565a3 --- /dev/null +++ b/docs/reference/docs/bulk-udp.asciidoc @@ -0,0 +1,57 @@ +[[docs-bulk-udp]] +== Bulk UDP API + +A Bulk UDP service is a service listening over UDP for bulk format +requests. The idea is to provide a low latency UDP service that allows +to easily index data that is not of critical nature. + +The Bulk UDP service is disabled by default, but can be enabled by +setting `bulk.udp.enabled` to `true`. + +The bulk UDP service performs internal bulk aggregation of the data and +then flushes it based on several parameters: + +`bulk.udp.bulk_actions`:: + The number of actions to flush a bulk after, + defaults to `1000`. + +`bulk.udp.bulk_size`:: + The size of the current bulk request to flush + the request once exceeded, defaults to `5mb`. + +`bulk.udp.flush_interval`:: + An interval after which the current + request is flushed, regardless of the above limits. Defaults to `5s`. +`bulk.udp.concurrent_requests`:: + The number on max in flight bulk + requests allowed. Defaults to `4`. + +The allowed network settings are: + +`bulk.udp.host`:: + The host to bind to, defaults to `network.host` + which defaults to any. + +`bulk.udp.port`:: + The port to use, defaults to `9700-9800`. + +`bulk.udp.receive_buffer_size`:: + The receive buffer size, defaults to `10mb`. + +Here is an example of how it can be used: + +[source,js] +-------------------------------------------------- +> cat bulk.txt +{ "index" : { "_index" : "test", "_type" : "type1" } } +{ "field1" : "value1" } +{ "index" : { "_index" : "test", "_type" : "type1" } } +{ "field1" : "value1" } +-------------------------------------------------- + +[source,js] +-------------------------------------------------- +> cat bulk.txt | nc -w 0 -u localhost 9700 +-------------------------------------------------- + + diff --git a/docs/reference/docs/bulk.asciidoc b/docs/reference/docs/bulk.asciidoc new file mode 100644 index 0000000..6db77b0 --- /dev/null +++ b/docs/reference/docs/bulk.asciidoc @@ -0,0 +1,182 @@ +[[docs-bulk]] +== Bulk API + +The bulk API makes it possible to perform many index/delete operations +in a single API call. This can greatly increase the indexing speed. The +REST API endpoint is `/_bulk`, and it expects the following JSON +structure: + +[source,js] +-------------------------------------------------- +action_and_meta_data\n +optional_source\n +action_and_meta_data\n +optional_source\n +.... +action_and_meta_data\n +optional_source\n +-------------------------------------------------- + +*NOTE*: the final line of data must end with a newline character `\n`. + +The possible actions are `index`, `create`, `delete` and `update`. +`index` and `create` expect a source on the next +line, and have the same semantics as the `op_type` parameter to the +standard index API (i.e. create will fail if a document with the same +index and type exists already, whereas index will add or replace a +document as necessary). `delete` does not expect a source on the +following line, and has the same semantics as the standard delete API. +`update` expects that the partial doc, upsert and script and its options +are specified on the next line. + +If you're providing text file input to `curl`, you *must* use the +`--data-binary` flag instead of plain `-d`. The latter doesn't preserve +newlines. Example: + +[source,js] +-------------------------------------------------- +$ cat requests +{ "index" : { "_index" : "test", "_type" : "type1", "_id" : "1" } } +{ "field1" : "value1" } +$ curl -s -XPOST localhost:9200/_bulk --data-binary @requests; echo +{"took":7,"items":[{"create":{"_index":"test","_type":"type1","_id":"1","_version":1}}]} +-------------------------------------------------- + +Because this format uses literal `\n`'s as delimiters, please be sure +that the JSON actions and sources are not pretty printed. Here is an +example of a correct sequence of bulk commands: + +[source,js] +-------------------------------------------------- +{ "index" : { "_index" : "test", "_type" : "type1", "_id" : "1" } } +{ "field1" : "value1" } +{ "delete" : { "_index" : "test", "_type" : "type1", "_id" : "2" } } +{ "create" : { "_index" : "test", "_type" : "type1", "_id" : "3" } } +{ "field1" : "value3" } +{ "update" : {"_id" : "1", "_type" : "type1", "_index" : "index1"} } +{ "doc" : {"field2" : "value2"} } +-------------------------------------------------- + +In the above example `doc` for the `update` action is a partial +document, that will be merged with the already stored document. + +The endpoints are `/_bulk`, `/{index}/_bulk`, and `{index}/type/_bulk`. +When the index or the index/type are provided, they will be used by +default on bulk items that don't provide them explicitly. + +A note on the format. The idea here is to make processing of this as +fast as possible. As some of the actions will be redirected to other +shards on other nodes, only `action_meta_data` is parsed on the +receiving node side. + +Client libraries using this protocol should try and strive to do +something similar on the client side, and reduce buffering as much as +possible. + +The response to a bulk action is a large JSON structure with the +individual results of each action that was performed. The failure of a +single action does not affect the remaining actions. + +There is no "correct" number of actions to perform in a single bulk +call. You should experiment with different settings to find the optimum +size for your particular workload. + +If using the HTTP API, make sure that the client does not send HTTP +chunks, as this will slow things down. + +[float] +[[bulk-versioning]] +=== Versioning + +Each bulk item can include the version value using the +`_version`/`version` field. It automatically follows the behavior of the +index / delete operation based on the `_version` mapping. It also +support the `version_type`/`_version_type` when using `external` +versioning. + +[float] +[[bulk-routing]] +=== Routing + +Each bulk item can include the routing value using the +`_routing`/`routing` field. It automatically follows the behavior of the +index / delete operation based on the `_routing` mapping. + +[float] +[[bulk-parent]] +=== Parent + +Each bulk item can include the parent value using the `_parent`/`parent` +field. It automatically follows the behavior of the index / delete +operation based on the `_parent` / `_routing` mapping. + +[float] +[[bulk-timestamp]] +=== Timestamp + +Each bulk item can include the timestamp value using the +`_timestamp`/`timestamp` field. It automatically follows the behavior of +the index operation based on the `_timestamp` mapping. + +[float] +[[bulk-ttl]] +=== TTL + +Each bulk item can include the ttl value using the `_ttl`/`ttl` field. +It automatically follows the behavior of the index operation based on +the `_ttl` mapping. + +[float] +[[bulk-consistency]] +=== Write Consistency + +When making bulk calls, you can require a minimum number of active +shards in the partition through the `consistency` parameter. The values +allowed are `one`, `quorum`, and `all`. It defaults to the node level +setting of `action.write_consistency`, which in turn defaults to +`quorum`. + +For example, in a N shards with 2 replicas index, there will have to be +at least 2 active shards within the relevant partition (`quorum`) for +the operation to succeed. In a N shards with 1 replica scenario, there +will need to be a single shard active (in this case, `one` and `quorum` +is the same). + +[float] +[[bulk-refresh]] +=== Refresh + +The `refresh` parameter can be set to `true` in order to refresh the +relevant shards immediately after the bulk operation has occurred and +make it searchable, instead of waiting for the normal refresh interval +to expire. Setting it to `true` can trigger additional load, and may +slow down indexing. + +[float] +[[bulk-update]] +=== Update + +When using `update` action `_retry_on_conflict` can be used as field in +the action itself (not in the extra payload line), to specify how many +times an update should be retried in the case of a version conflict. + +The `update` action payload, supports the following options: `doc` +(partial document), `upsert`, `doc_as_upsert`, `script`, `params` (for +script), `lang` (for script). See update documentation for details on +the options. Curl example with update actions: + +[source,js] +-------------------------------------------------- +{ "update" : {"_id" : "1", "_type" : "type1", "_index" : "index1", "_retry_on_conflict" : 3} } +{ "doc" : {"field" : "value"} } +{ "update" : { "_id" : "0", "_type" : "type1", "_index" : "index1", "_retry_on_conflict" : 3} } +{ "script" : "ctx._source.counter += param1", "lang" : "js", "params" : {"param1" : 1}, "upsert" : {"counter" : 1}} +{ "update" : {"_id" : "2", "_type" : "type1", "_index" : "index1", "_retry_on_conflict" : 3} } +{ "doc" : {"field" : "value"}, "doc_as_upsert" : true } +-------------------------------------------------- + +[float] +[[bulk-security]] +=== Security + +See <<url-access-control>> diff --git a/docs/reference/docs/delete-by-query.asciidoc b/docs/reference/docs/delete-by-query.asciidoc new file mode 100644 index 0000000..93e1c05 --- /dev/null +++ b/docs/reference/docs/delete-by-query.asciidoc @@ -0,0 +1,150 @@ +[[docs-delete-by-query]] +== Delete By Query API + +The delete by query API allows to delete documents from one or more +indices and one or more types based on a query. The query can either be +provided using a simple query string as a parameter, or using the +<<query-dsl,Query DSL>> defined within the request +body. Here is an example: + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/twitter/tweet/_query?q=user:kimchy' + +$ curl -XDELETE 'http://localhost:9200/twitter/tweet/_query' -d '{ + "query" : { + "term" : { "user" : "kimchy" } + } +} +' +-------------------------------------------------- + +NOTE: The query being sent in the body must be nested in a `query` key, same as +the <<search-search,search api>> works added[1.0.0.RC1,The query was previously the top-level object]. + +Both above examples end up doing the same thing, which is delete all +tweets from the twitter index for a certain user. The result of the +commands is: + +[source,js] +-------------------------------------------------- +{ + "_indices" : { + "twitter" : { + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0 + } + } + } +} +-------------------------------------------------- + +Note, delete by query bypasses versioning support. Also, it is not +recommended to delete "large chunks of the data in an index", many +times, it's better to simply reindex into a new index. + +[float] +[[multiple-indices]] +=== Multiple Indices and Types + +The delete by query API can be applied to multiple types within an +index, and across multiple indices. For example, we can delete all +documents across all types within the twitter index: + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/twitter/_query?q=user:kimchy' +-------------------------------------------------- + +We can also delete within specific types: + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/twitter/tweet,user/_query?q=user:kimchy' +-------------------------------------------------- + +We can also delete all tweets with a certain tag across several indices +(for example, when each user has his own index): + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/kimchy,elasticsearch/_query?q=tag:wow' +-------------------------------------------------- + +Or even delete across all indices: + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/_all/_query?q=tag:wow' +-------------------------------------------------- + +[float] +[[delete-by-query-parameters]] +=== Request Parameters + +When executing a delete by query using the query parameter `q`, the +query passed is a query string using Lucene query parser. There are +additional parameters that can be passed: + +[cols="<,<",options="header",] +|======================================================================= +|Name |Description +|df |The default field to use when no field prefix is defined within the +query. + +|analyzer |The analyzer name to be used when analyzing the query string. + +|default_operator |The default operator to be used, can be `AND` or +`OR`. Defaults to `OR`. +|======================================================================= + +[float] +[[request-body]] +=== Request Body + +The delete by query can use the <<query-dsl,Query +DSL>> within its body in order to express the query that should be +executed and delete all documents. The body content can also be passed +as a REST parameter named `source`. + +[float] +[[delete-by-query-distributed]] +=== Distributed + +The delete by query API is broadcast across all primary shards, and from +there, replicated across all shards replicas. + +[float] +[[delete-by-query-routing]] +=== Routing + +The routing value (a comma separated list of the routing values) can be +specified to control which shards the delete by query request will be +executed on. + +[float] +[[replication-type]] +=== Replication Type + +The replication of the operation can be done in an asynchronous manner +to the replicas (the operation will return once it has be executed on +the primary shard). The `replication` parameter can be set to `async` +(defaults to `sync`) in order to enable it. + +[float] +[[delete-by-query-consistency]] +=== Write Consistency + +Control if the operation will be allowed to execute based on the number +of active shards within that partition (replication group). The values +allowed are `one`, `quorum`, and `all`. The parameter to set it is +`consistency`, and it defaults to the node level setting of +`action.write_consistency` which in turn defaults to `quorum`. + +For example, in a N shards with 2 replicas index, there will have to be +at least 2 active shards within the relevant partition (`quorum`) for +the operation to succeed. In a N shards with 1 replica scenario, there +will need to be a single shard active (in this case, `one` and `quorum` +is the same). diff --git a/docs/reference/docs/delete.asciidoc b/docs/reference/docs/delete.asciidoc new file mode 100644 index 0000000..c1db8b5 --- /dev/null +++ b/docs/reference/docs/delete.asciidoc @@ -0,0 +1,142 @@ +[[docs-delete]] +== Delete API + +The delete API allows to delete a typed JSON document from a specific +index based on its id. The following example deletes the JSON document +from an index called twitter, under a type called tweet, with id valued +1: + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/twitter/tweet/1' +-------------------------------------------------- + +The result of the above delete operation is: + +[source,js] +-------------------------------------------------- +{ + "found" : true, + "_index" : "twitter", + "_type" : "tweet", + "_id" : "1", + "_version" : 2 +} +-------------------------------------------------- + +[float] +[[delete-versioning]] +=== Versioning + +Each document indexed is versioned. When deleting a document, the +`version` can be specified to make sure the relevant document we are +trying to delete is actually being deleted and it has not changed in the +meantime. Every write operation executed on a document, deletes included, +causes its version to be incremented. + +[float] +[[delete-routing]] +=== Routing + +When indexing using the ability to control the routing, in order to +delete a document, the routing value should also be provided. For +example: + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/twitter/tweet/1?routing=kimchy' +-------------------------------------------------- + +The above will delete a tweet with id 1, but will be routed based on the +user. Note, issuing a delete without the correct routing, will cause the +document to not be deleted. + +Many times, the routing value is not known when deleting a document. For +those cases, when specifying the `_routing` mapping as `required`, and +no routing value is specified, the delete will be broadcasted +automatically to all shards. + +[float] +[[delete-parent]] +=== Parent + +The `parent` parameter can be set, which will basically be the same as +setting the routing parameter. + +Note that deleting a parent document does not automatically delete its +children. One way of deleting all child documents given a parent's id is +to perform a <<docs-delete-by-query,delete by query>> on the child +index with the automatically generated (and indexed) +field _parent, which is in the format parent_type#parent_id. + +[float] +[[delete-index-creation]] +=== Automatic index creation + +The delete operation automatically creates an index if it has not been +created before (check out the <<indices-create-index,create index API>> +for manually creating an index), and also automatically creates a +dynamic type mapping for the specific type if it has not been created +before (check out the <<indices-put-mapping,put mapping>> +API for manually creating type mapping). + +[float] +[[delete-distributed]] +=== Distributed + +The delete operation gets hashed into a specific shard id. It then gets +redirected into the primary shard within that id group, and replicated +(if needed) to shard replicas within that id group. + +[float] +[[delete-replication]] +=== Replication Type + +The replication of the operation can be done in an asynchronous manner +to the replicas (the operation will return once it has be executed on +the primary shard). The `replication` parameter can be set to `async` +(defaults to `sync`) in order to enable it. + +[float] +[[delete-consistency]] +=== Write Consistency + +Control if the operation will be allowed to execute based on the number +of active shards within that partition (replication group). The values +allowed are `one`, `quorum`, and `all`. The parameter to set it is +`consistency`, and it defaults to the node level setting of +`action.write_consistency` which in turn defaults to `quorum`. + +For example, in a N shards with 2 replicas index, there will have to be +at least 2 active shards within the relevant partition (`quorum`) for +the operation to succeed. In a N shards with 1 replica scenario, there +will need to be a single shard active (in this case, `one` and `quorum` +is the same). + +[float] +[[delete-refresh]] +=== Refresh + +The `refresh` parameter can be set to `true` in order to refresh the +relevant shard after the delete operation has occurred and make it +searchable. Setting it to `true` should be done after careful thought +and verification that this does not cause a heavy load on the system +(and slows down indexing). + +[float] +[[delete-timeout]] +=== Timeout + +The primary shard assigned to perform the delete operation might not be +available when the delete operation is executed. Some reasons for this +might be that the primary shard is currently recovering from a gateway +or undergoing relocation. By default, the delete operation will wait on +the primary shard to become available for up to 1 minute before failing +and responding with an error. The `timeout` parameter can be used to +explicitly specify how long it waits. Here is an example of setting it +to 5 minutes: + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/twitter/tweet/1?timeout=5m' +-------------------------------------------------- diff --git a/docs/reference/docs/get.asciidoc b/docs/reference/docs/get.asciidoc new file mode 100644 index 0000000..cb8fb53 --- /dev/null +++ b/docs/reference/docs/get.asciidoc @@ -0,0 +1,214 @@ +[[docs-get]] +== Get API + +The get API allows to get a typed JSON document from the index based on +its id. The following example gets a JSON document from an index called +twitter, under a type called tweet, with id valued 1: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1' +-------------------------------------------------- + +The result of the above get operation is: + +[source,js] +-------------------------------------------------- +{ + "_index" : "twitter", + "_type" : "tweet", + "_id" : "1", + "_version" : 1, + "found": true, + "_source" : { + "user" : "kimchy", + "postDate" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" + } +} +-------------------------------------------------- + +The above result includes the `_index`, `_type`, `_id` and `_version` +of the document we wish to retrieve, including the actual `_source` +of the document if it could be found (as indicated by the `found` +field in the response). + +The API also allows to check for the existence of a document using +`HEAD`, for example: + +[source,js] +-------------------------------------------------- +curl -XHEAD -i 'http://localhost:9200/twitter/tweet/1' +-------------------------------------------------- + +[float] +[[realtime]] +=== Realtime + +By default, the get API is realtime, and is not affected by the refresh +rate of the index (when data will become visible for search). + +In order to disable realtime GET, one can either set `realtime` +parameter to `false`, or globally default it to by setting the +`action.get.realtime` to `false` in the node configuration. + +When getting a document, one can specify `fields` to fetch from it. They +will, when possible, be fetched as stored fields (fields mapped as +stored in the mapping). When using realtime GET, there is no notion of +stored fields (at least for a period of time, basically, until the next +flush), so they will be extracted from the source itself (note, even if +source is not enabled). It is a good practice to assume that the fields +will be loaded from source when using realtime GET, even if the fields +are stored. + +[float] +[[type]] +=== Optional Type + +The get API allows for `_type` to be optional. Set it to `_all` in order +to fetch the first document matching the id across all types. + + +[float] +[[get-source-filtering]] +=== Source filtering + +added[1.0.0.Beta1] + +By default, the get operation returns the contents of the `_source` field unless +you have used the `fields` parameter or if the `_source` field is disabled. +You can turn off `_source` retrieval by using the `_source` parameter: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1?_source=false' +-------------------------------------------------- + +If you only need one or two fields from the complete `_source`, you can use the `_source_include` +& `_source_exclude` parameters to include or filter out that parts you need. This can be especially helpful +with large documents where partial retrieval can save on network overhead. Both parameters take a comma separated list +of fields or wildcard expressions. Example: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1?_source_include=*.id&_source_exclude=entities' +-------------------------------------------------- + +If you only want to specify includes, you can use a shorter notation: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1?_source=*.id,retweeted' +-------------------------------------------------- + + +[float] +[[get-fields]] +=== Fields + +The get operation allows specifying a set of stored fields that will be +returned by passing the `fields` parameter. For example: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1?fields=title,content' +-------------------------------------------------- + +For backward compatibility, if the requested fields are not stored, they will be fetched +from the `_source` (parsed and extracted). This functionality has been replaced by the +<<get-source-filtering,source filtering>> parameter. + +Field values fetched from the document it self are always returned as an array. Metadata fields like `_routing` and +`_parent` fields are never returned as an array. + +Also only leaf fields can be returned via the `field` option. So object fields can't be returned and such requests +will fail. + +[float] +[[_source]] +=== Getting the _source directly + +Use the `/{index}/{type}/{id}/_source` endpoint to get +just the `_source` field of the document, +without any additional content around it. For example: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1/_source' +-------------------------------------------------- + +You can also use the same source filtering parameters to control which parts of the `_source` will be returned: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1/_source?_source_include=*.id&_source_exclude=entities' +-------------------------------------------------- + +Note, there is also a HEAD variant for the _source endpoint to efficiently test for document existence. +Curl example: + +[source,js] +-------------------------------------------------- +curl -XHEAD -i 'http://localhost:9200/twitter/tweet/1/_source' +-------------------------------------------------- + +[float] +[[get-routing]] +=== Routing + +When indexing using the ability to control the routing, in order to get +a document, the routing value should also be provided. For example: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1?routing=kimchy' +-------------------------------------------------- + +The above will get a tweet with id 1, but will be routed based on the +user. Note, issuing a get without the correct routing, will cause the +document not to be fetched. + +[float] +[[preference]] +=== Preference + +Controls a `preference` of which shard replicas to execute the get +request on. By default, the operation is randomized between the shard +replicas. + +The `preference` can be set to: + +`_primary`:: + The operation will go and be executed only on the primary + shards. + +`_local`:: + The operation will prefer to be executed on a local + allocated shard if possible. + +Custom (string) value:: + A custom value will be used to guarantee that + the same shards will be used for the same custom value. This can help + with "jumping values" when hitting different shards in different refresh + states. A sample value can be something like the web session id, or the + user name. + +[float] +[[get-refresh]] +=== Refresh + +The `refresh` parameter can be set to `true` in order to refresh the +relevant shard before the get operation and make it searchable. Setting +it to `true` should be done after careful thought and verification that +this does not cause a heavy load on the system (and slows down +indexing). + +[float] +[[get-distributed]] +=== Distributed + +The get operation gets hashed into a specific shard id. It then gets +redirected to one of the replicas within that shard id and returns the +result. The replicas are the primary shard and its replicas within that +shard id group. This means that the more replicas we will have, the +better GET scaling we will have. diff --git a/docs/reference/docs/index_.asciidoc b/docs/reference/docs/index_.asciidoc new file mode 100644 index 0000000..6c93e82 --- /dev/null +++ b/docs/reference/docs/index_.asciidoc @@ -0,0 +1,362 @@ +[[docs-index_]] +== Index API + +The index API adds or updates a typed JSON document in a specific index, +making it searchable. The following example inserts the JSON document +into the "twitter" index, under a type called "tweet" with an id of 1: + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{ + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +}' +-------------------------------------------------- + +The result of the above index operation is: + +[source,js] +-------------------------------------------------- +{ + "_index" : "twitter", + "_type" : "tweet", + "_id" : "1", + "_version" : 1, + "created" : true +} +-------------------------------------------------- + +[float] +[[index-creation]] +=== Automatic Index Creation + +The index operation automatically creates an index if it has not been +created before (check out the +<<indices-create-index,create index API>> for manually +creating an index), and also automatically creates a +dynamic type mapping for the specific type if one has not yet been +created (check out the <<indices-put-mapping,put mapping>> +API for manually creating a type mapping). + +The mapping itself is very flexible and is schema-free. New fields and +objects will automatically be added to the mapping definition of the +type specified. Check out the <<mapping,mapping>> +section for more information on mapping definitions. + +Note that the format of the JSON document can also include the type (very handy +when using JSON mappers) if the `index.mapping.allow_type_wrapper` setting is +set to true, for example: + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter' -d '{ + "settings": { + "index": { + "mapping.allow_type_wrapper": true + } + } +}' +{"acknowledged":true} + +$ curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{ + "tweet" : { + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" + } +}' +-------------------------------------------------- + +Automatic index creation can be disabled by setting +`action.auto_create_index` to `false` in the config file of all nodes. +Automatic mapping creation can be disabled by setting +`index.mapper.dynamic` to `false` in the config files of all nodes (or +on the specific index settings). + +Automatic index creation can include a pattern based white/black list, +for example, set `action.auto_create_index` to `+aaa*,-bbb*,+ccc*,-*` (+ +meaning allowed, and - meaning disallowed). + +[float] +[[index-versioning]] +=== Versioning + +Each indexed document is given a version number. The associated +`version` number is returned as part of the response to the index API +request. The index API optionally allows for +http://en.wikipedia.org/wiki/Optimistic_concurrency_control[optimistic +concurrency control] when the `version` parameter is specified. This +will control the version of the document the operation is intended to be +executed against. A good example of a use case for versioning is +performing a transactional read-then-update. Specifying a `version` from +the document initially read ensures no changes have happened in the +meantime (when reading in order to update, it is recommended to set +`preference` to `_primary`). For example: + +[source,js] +-------------------------------------------------- +curl -XPUT 'localhost:9200/twitter/tweet/1?version=2' -d '{ + "message" : "elasticsearch now has versioning support, double cool!" +}' +-------------------------------------------------- + +*NOTE:* versioning is completely real time, and is not affected by the +near real time aspects of search operations. If no version is provided, +then the operation is executed without any version checks. + +By default, internal versioning is used that starts at 1 and increments +with each update, deletes included. Optionally, the version number can be +supplemented with an external value (for example, if maintained in a +database). To enable this functionality, `version_type` should be set to +`external`. The value provided must be a numeric, long value greater than 0, +and less than around 9.2e+18. When using the external version type, instead +of checking for a matching version number, the system checks to see if +the version number passed to the index request is greater than the +version of the currently stored document. If true, the document will be +indexed and the new version number used. If the value provided is less +than or equal to the stored document's version number, a version +conflict will occur and the index operation will fail. + +A nice side effect is that there is no need to maintain strict ordering +of async indexing operations executed as a result of changes to a source +database, as long as version numbers from the source database are used. +Even the simple case of updating the elasticsearch index using data from +a database is simplified if external versioning is used, as only the +latest version will be used if the index operations are out of order for +whatever reason. + +[float] +[[operation-type]] +=== Operation Type + +The index operation also accepts an `op_type` that can be used to force +a `create` operation, allowing for "put-if-absent" behavior. When +`create` is used, the index operation will fail if a document by that id +already exists in the index. + +Here is an example of using the `op_type` parameter: + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/tweet/1?op_type=create' -d '{ + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +}' +-------------------------------------------------- + +Another option to specify `create` is to use the following uri: + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/tweet/1/_create' -d '{ + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +}' +-------------------------------------------------- + +[float] +=== Automatic ID Generation + +The index operation can be executed without specifying the id. In such a +case, an id will be generated automatically. In addition, the `op_type` +will automatically be set to `create`. Here is an example (note the +*POST* used instead of *PUT*): + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/tweet/' -d '{ + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +}' +-------------------------------------------------- + +The result of the above index operation is: + +[source,js] +-------------------------------------------------- +{ + "_index" : "twitter", + "_type" : "tweet", + "_id" : "6a8ca01c-7896-48e9-81cc-9f70661fcb32", + "_version" : 1, + "created" : true +} +-------------------------------------------------- + +[float] +[[index-routing]] +=== Routing + +By default, shard placement — or `routing` — is controlled by using a +hash of the document's id value. For more explicit control, the value +fed into the hash function used by the router can be directly specified +on a per-operation basis using the `routing` parameter. For example: + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/tweet?routing=kimchy' -d '{ + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +}' +-------------------------------------------------- + +In the example above, the "tweet" document is routed to a shard based on +the `routing` parameter provided: "kimchy". + +When setting up explicit mapping, the `_routing` field can be optionally +used to direct the index operation to extract the routing value from the +document itself. This does come at the (very minimal) cost of an +additional document parsing pass. If the `_routing` mapping is defined, +and set to be `required`, the index operation will fail if no routing +value is provided or extracted. + +[float] +[[parent-children]] +=== Parents & Children + +A child document can be indexed by specifying its parent when indexing. +For example: + +[source,js] +-------------------------------------------------- +$ curl -XPUT localhost:9200/blogs/blog_tag/1122?parent=1111 -d '{ + "tag" : "something" +}' +-------------------------------------------------- + +When indexing a child document, the routing value is automatically set +to be the same as its parent, unless the routing value is explicitly +specified using the `routing` parameter. + +[float] +[[index-timestamp]] +=== Timestamp + +A document can be indexed with a `timestamp` associated with it. The +`timestamp` value of a document can be set using the `timestamp` +parameter. For example: + +[source,js] +-------------------------------------------------- +$ curl -XPUT localhost:9200/twitter/tweet/1?timestamp=2009-11-15T14%3A12%3A12 -d '{ + "user" : "kimchy", + "message" : "trying out Elasticsearch", +}' +-------------------------------------------------- + +If the `timestamp` value is not provided externally or in the `_source`, +the `timestamp` will be automatically set to the date the document was +processed by the indexing chain. More information can be found on the +<<mapping-timestamp-field,_timestamp mapping +page>>. + +[float] +[[index-ttl]] +=== TTL + +A document can be indexed with a `ttl` (time to live) associated with +it. Expired documents will be expunged automatically. The expiration +date that will be set for a document with a provided `ttl` is relative +to the `timestamp` of the document, meaning it can be based on the time +of indexing or on any time provided. The provided `ttl` must be strictly +positive and can be a number (in milliseconds) or any valid time value +as shown in the following examples: + +[source,js] +-------------------------------------------------- +curl -XPUT 'http://localhost:9200/twitter/tweet/1?ttl=86400000' -d '{ + "user": "kimchy", + "message": "Trying out elasticsearch, so far so good?" +}' +-------------------------------------------------- + +[source,js] +-------------------------------------------------- +curl -XPUT 'http://localhost:9200/twitter/tweet/1?ttl=1d' -d '{ + "user": "kimchy", + "message": "Trying out elasticsearch, so far so good?" +}' +-------------------------------------------------- + +[source,js] +-------------------------------------------------- +curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{ + "_ttl": "1d", + "user": "kimchy", + "message": "Trying out elasticsearch, so far so good?" +}' +-------------------------------------------------- + +More information can be found on the +<<mapping-ttl-field,_ttl mapping page>>. + +[float] +[[index-distributed]] +=== Distributed + +The index operation is directed to the primary shard based on its route +(see the Routing section above) and performed on the actual node +containing this shard. After the primary shard completes the operation, +if needed, the update is distributed to applicable replicas. + +[float] +[[index-consistency]] +=== Write Consistency + +To prevent writes from taking place on the "wrong" side of a network +partition, by default, index operations only succeed if a quorum +(>replicas/2+1) of active shards are available. This default can be +overridden on a node-by-node basis using the `action.write_consistency` +setting. To alter this behavior per-operation, the `consistency` request +parameter can be used. + +Valid write consistency values are `one`, `quorum`, and `all`. + +[float] +[[index-replication]] +=== Asynchronous Replication + +By default, the index operation only returns after all shards within the +replication group have indexed the document (sync replication). To +enable asynchronous replication, causing the replication process to take +place in the background, set the `replication` parameter to `async`. +When asynchronous replication is used, the index operation will return +as soon as the operation succeeds on the primary shard. + +[float] +[[index-refresh]] +=== Refresh + +To refresh the index immediately after the operation occurs, so that the +document appears in search results immediately, the `refresh` parameter +can be set to `true`. Setting this option to `true` should *ONLY* be +done after careful thought and verification that it does not lead to +poor performance, both from an indexing and a search standpoint. Note, +getting a document using the get API is completely realtime. + +[float] +[[timeout]] +=== Timeout + +The primary shard assigned to perform the index operation might not be +available when the index operation is executed. Some reasons for this +might be that the primary shard is currently recovering from a gateway +or undergoing relocation. By default, the index operation will wait on +the primary shard to become available for up to 1 minute before failing +and responding with an error. The `timeout` parameter can be used to +explicitly specify how long it waits. Here is an example of setting it +to 5 minutes: + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/tweet/1?timeout=5m' -d '{ + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +}' +-------------------------------------------------- diff --git a/docs/reference/docs/multi-get.asciidoc b/docs/reference/docs/multi-get.asciidoc new file mode 100644 index 0000000..d189a95 --- /dev/null +++ b/docs/reference/docs/multi-get.asciidoc @@ -0,0 +1,176 @@ +[[docs-multi-get]] +== Multi Get API + +Multi GET API allows to get multiple documents based on an index, type +(optional) and id (and possibly routing). The response includes a `docs` +array with all the fetched documents, each element similar in structure +to a document provided by the <<docs-get,get>> +API. Here is an example: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/_mget' -d '{ + "docs" : [ + { + "_index" : "test", + "_type" : "type", + "_id" : "1" + }, + { + "_index" : "test", + "_type" : "type", + "_id" : "2" + } + ] +}' +-------------------------------------------------- + +The `mget` endpoint can also be used against an index (in which case it +is not required in the body): + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/test/_mget' -d '{ + "docs" : [ + { + "_type" : "type", + "_id" : "1" + }, + { + "_type" : "type", + "_id" : "2" + } + ] +}' +-------------------------------------------------- + +And type: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/test/type/_mget' -d '{ + "docs" : [ + { + "_id" : "1" + }, + { + "_id" : "2" + } + ] +}' +-------------------------------------------------- + +In which case, the `ids` element can directly be used to simplify the +request: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/test/type/_mget' -d '{ + "ids" : ["1", "2"] +}' +-------------------------------------------------- + +[float] +[[mget-source-filtering]] +=== Source filtering + +added[1.0.0.Beta1] + +By default, the `_source` field will be returned for every document (if stored). +Similar to the <<get-source-filtering,get>> API, you can retrieve only parts of +the `_source` (or not at all) by using the `_source` parameter. You can also use +the url parameters `_source`,`_source_include` & `_source_exclude` to specify defaults, +which will be used when there are no per-document instructions. + +For example: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/_mget' -d '{ + "docs" : [ + { + "_index" : "test", + "_type" : "type", + "_id" : "1", + "_source" : false + }, + { + "_index" : "test", + "_type" : "type", + "_id" : "2", + "_source" : ["field3", "field4"] + }, + { + "_index" : "test", + "_type" : "type", + "_id" : "3", + "_source" : { + "include": ["user"], + "_exclude": ["user.location"] + } + } + ] +}' +-------------------------------------------------- + + +[float] +[[mget-fields]] +=== Fields + +Specific stored fields can be specified to be retrieved per document to get, similar to the <<get-fields,fields>> parameter of the Get API. +For example: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/_mget' -d '{ + "docs" : [ + { + "_index" : "test", + "_type" : "type", + "_id" : "1", + "fields" : ["field1", "field2"] + }, + { + "_index" : "test", + "_type" : "type", + "_id" : "2", + "fields" : ["field3", "field4"] + } + ] +}' +-------------------------------------------------- + +[float] +[[mget-routing]] +=== Routing + +You can specify also specify routing value as a parameter: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/_mget?routing=key1' -d '{ + "docs" : [ + { + "_index" : "test", + "_type" : "type", + "_id" : "1", + "_routing" : "key2" + }, + { + "_index" : "test", + "_type" : "type", + "_id" : "2" + } + ] +}' +-------------------------------------------------- + +In this example, document `test/type/2` will be fetch from shard corresponding to routing key `key1` but +document `test/type/1` will be fetch from shard corresponding to routing key `key2`. + +[float] +[[mget-security]] +=== Security + +See <<url-access-control>> diff --git a/docs/reference/docs/multi-termvectors.asciidoc b/docs/reference/docs/multi-termvectors.asciidoc new file mode 100644 index 0000000..207fee8 --- /dev/null +++ b/docs/reference/docs/multi-termvectors.asciidoc @@ -0,0 +1,93 @@ +[[docs-multi-termvectors]] +== Multi termvectors API + +Multi termvectors API allows to get multiple termvectors based on an index, type and id. The response includes a `docs` +array with all the fetched termvectors, each element having the structure +provided by the <<docs-termvectors,termvectors>> +API. Here is an example: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/_mtermvectors' -d '{ +{ + "docs": [ + { + "_index": "testidx", + "_type": "test", + "_id": "2", + "term_statistics": true + }, + { + "_index": "testidx", + "_type": "test", + "_id": "1", + "fields": [ + "text" + ] + } + ] +}' +-------------------------------------------------- + +See the <<docs-termvectors,termvectors>> API for a description of possible parameters. + +The `_mtermvectors` endpoint can also be used against an index (in which case it +is not required in the body): + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/testidx/_mtermvectors' -d '{ + "docs": [ + { + "_type": "test", + "_id": "2", + "fields": [ + "text" + ], + "term_statistics": true + }, + { + "_type": "test", + "_id": "1" + } + ] +}' +-------------------------------------------------- + +And type: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/testidx/test/_mtermvectors' -d '{ + "docs": [ + { + "_id": "2", + "fields": [ + "text" + ], + "term_statistics": true + }, + { + "_id": "1" + } + ] +}' +-------------------------------------------------- + +If all requested documents are on same index and have same type and also the parameters are the same, the request can be simplified: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/testidx/test/_mtermvectors' -d '{ + "ids" : ["1", "2"], + "parameters": { + "fields": [ + "text" + ], + "term_statistics": true, + … + } +}' +-------------------------------------------------- + +Parameters can aslo be set by passing them as uri parameters (see <<docs-termvectors,termvectors>>). uri parameters are the default parameters and are overwritten by any parameter setting defined in the body. diff --git a/docs/reference/docs/termvectors.asciidoc b/docs/reference/docs/termvectors.asciidoc new file mode 100644 index 0000000..b44f4fc --- /dev/null +++ b/docs/reference/docs/termvectors.asciidoc @@ -0,0 +1,224 @@ +[[docs-termvectors]] +== Term Vectors + +added[1.0.0.Beta1] + +Returns information and statistics on terms in the fields of a +particular document as stored in the index. + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1/_termvector?pretty=true' +-------------------------------------------------- + +Optionally, you can specify the fields for which the information is +retrieved either with a parameter in the url + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/1/_termvector?fields=text,...' +-------------------------------------------------- + +or adding by adding the requested fields in the request body (see +example below). + +[float] +=== Return values + +Three types of values can be requested: _term information_, _term statistics_ +and _field statistics_. By default, all term information and field +statistics are returned for all fields but no term statistics. + +[float] +==== Term information + + * term frequency in the field (always returned) + * term positions (`positions` : true) + * start and end offsets (`offsets` : true) + * term payloads (`payloads` : true), as base64 encoded bytes + +If the requested information wasn't stored in the index, it will be +omitted without further warning. See <<mapping-types,type mapping>> +for how to configure your index to store term vectors. + +[WARNING] +====== +Start and end offsets assume UTF-16 encoding is being used. If you want to use +these offsets in order to get the original text that produced this token, you +should make sure that the string you are taking a sub-string of is also encoded +using UTF-16. +====== + +[float] +==== Term statistics + +Setting `term_statistics` to `true` (default is `false`) will +return + + * total term frequency (how often a term occurs in all documents) + + * document frequency (the number of documents containing the current + term) + +By default these values are not returned since term statistics can +have a serious performance impact. + +[float] +==== Field statistics + +Setting `field_statistics` to `false` (default is `true`) will +omit : + + * document count (how many documents contain this field) + * sum of document frequencies (the sum of document frequencies for all + terms in this field) + * sum of total term frequencies (the sum of total term frequencies of + each term in this field) + +[float] +=== Behaviour + +The term and field statistics are not accurate. Deleted documents +are not taken into account. The information is only retrieved for the +shard the requested document resides in. The term and field statistics +are therefore only useful as relative measures whereas the absolute +numbers have no meaning in this context. + +[float] +=== Example + +First, we create an index that stores term vectors, payloads etc. : + +[source,js] +-------------------------------------------------- +curl -s -XPUT 'http://localhost:9200/twitter/' -d '{ + "mappings": { + "tweet": { + "properties": { + "text": { + "type": "string", + "term_vector": "with_positions_offsets_payloads", + "store" : true, + "index_analyzer" : "fulltext_analyzer" + }, + "fullname": { + "type": "string", + "term_vector": "with_positions_offsets_payloads", + "index_analyzer" : "fulltext_analyzer" + } + } + } + }, + "settings" : { + "index" : { + "number_of_shards" : 1, + "number_of_replicas" : 0 + }, + "analysis": { + "analyzer": { + "fulltext_analyzer": { + "type": "custom", + "tokenizer": "whitespace", + "filter": [ + "lowercase", + "type_as_payload" + ] + } + } + } + } +}' +-------------------------------------------------- + +Second, we add some documents: + +[source,js] +-------------------------------------------------- +curl -XPUT 'http://localhost:9200/twitter/tweet/1?pretty=true' -d '{ + "fullname" : "John Doe", + "text" : "twitter test test test " +}' + +curl -XPUT 'http://localhost:9200/twitter/tweet/2?pretty=true' -d '{ + "fullname" : "Jane Doe", + "text" : "Another twitter test ..." +}' +-------------------------------------------------- + +The following request returns all information and statistics for field +`text` in document `1` (John Doe): + +[source,js] +-------------------------------------------------- + +curl -XGET 'http://localhost:9200/twitter/tweet/1/_termvector?pretty=true' -d '{ + "fields" : ["text"], + "offsets" : true, + "payloads" : true, + "positions" : true, + "term_statistics" : true, + "field_statistics" : true +}' +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- + +{ + "_id": "1", + "_index": "twitter", + "_type": "tweet", + "_version": 1, + "found": true, + "term_vectors": { + "text": { + "field_statistics": { + "doc_count": 2, + "sum_doc_freq": 6, + "sum_ttf": 8 + }, + "terms": { + "test": { + "doc_freq": 2, + "term_freq": 3, + "tokens": [ + { + "end_offset": 12, + "payload": "d29yZA==", + "position": 1, + "start_offset": 8 + }, + { + "end_offset": 17, + "payload": "d29yZA==", + "position": 2, + "start_offset": 13 + }, + { + "end_offset": 22, + "payload": "d29yZA==", + "position": 3, + "start_offset": 18 + } + ], + "ttf": 4 + }, + "twitter": { + "doc_freq": 2, + "term_freq": 1, + "tokens": [ + { + "end_offset": 7, + "payload": "d29yZA==", + "position": 0, + "start_offset": 0 + } + ], + "ttf": 2 + } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/docs/update.asciidoc b/docs/reference/docs/update.asciidoc new file mode 100644 index 0000000..6c48a9b --- /dev/null +++ b/docs/reference/docs/update.asciidoc @@ -0,0 +1,176 @@ +[[docs-update]] +== Update API + +The update API allows to update a document based on a script provided. +The operation gets the document (collocated with the shard) from the +index, runs the script (with optional script language and parameters), +and index back the result (also allows to delete, or ignore the +operation). It uses versioning to make sure no updates have happened +during the "get" and "reindex". + +Note, this operation still means full reindex of the document, it just +removes some network roundtrips and reduces chances of version conflicts +between the get and the index. The `_source` field need to be enabled +for this feature to work. + +For example, lets index a simple doc: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/type1/1 -d '{ + "counter" : 1, + "tags" : ["red"] +}' +-------------------------------------------------- + +Now, we can execute a script that would increment the counter: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "script" : "ctx._source.counter += count", + "params" : { + "count" : 4 + } +}' +-------------------------------------------------- + +We can also add a tag to the list of tags (note, if the tag exists, it +will still add it, since its a list): + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "script" : "ctx._source.tags += tag", + "params" : { + "tag" : "blue" + } +}' +-------------------------------------------------- + +We can also add a new field to the document: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "script" : "ctx._source.text = \"some text\"" +}' +-------------------------------------------------- + +We can also remove a field from the document: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "script" : "ctx._source.remove(\"text\")" +}' +-------------------------------------------------- + +And, we can delete the doc if the tags contain blue, or ignore (noop): + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "script" : "ctx._source.tags.contains(tag) ? ctx.op = \"delete\" : ctx.op = \"none\"", + "params" : { + "tag" : "blue" + } +}' +-------------------------------------------------- + +*Note*: Be aware of MVEL and handling of ternary operators and +assignments. Assignment operations have lower precedence than the +ternary operator. Compare the following statements: + +[source,js] +-------------------------------------------------- +// Will NOT update the tags array +ctx._source.tags.contains(tag) ? ctx.op = \"none\" : ctx._source.tags += tag +// Will update +ctx._source.tags.contains(tag) ? (ctx.op = \"none\") : ctx._source.tags += tag +// Also works +if (ctx._source.tags.contains(tag)) { ctx.op = \"none\" } else { ctx._source.tags += tag } +-------------------------------------------------- + +The update API also support passing a partial document, +which will be merged into the existing document (simple recursive merge, +inner merging of objects, replacing core "keys/values" and arrays). For +example: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "doc" : { + "name" : "new_name" + } +}' +-------------------------------------------------- + +If both `doc` and `script` is specified, then `doc` is ignored. Best is +to put your field pairs of the partial document in the script itself. + +There is also support for `upsert`. If the document does +not already exists, the content of the `upsert` element will be used to +index the fresh doc: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "script" : "ctx._source.counter += count", + "params" : { + "count" : 4 + }, + "upsert" : { + "counter" : 1 + } +}' +-------------------------------------------------- + +Last it also supports `doc_as_upsert`. So that the +provided document will be inserted if the document does not already +exist. This will reduce the amount of data that needs to be sent to +elasticsearch. + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/test/type1/1/_update' -d '{ + "doc" : { + "name" : "new_name" + }, + "doc_as_upsert" : true +}' +-------------------------------------------------- + +The update operation supports similar parameters as the index API, +including: + +[horizontal] +`routing`:: Sets the routing that will be used to route the + document to the relevant shard. + +`parent`:: Simply sets the routing. + +`timeout`:: Timeout waiting for a shard to become available. + +`replication`:: The replication type for the delete/index operation + (sync or async). + +`consistency`:: The write consistency of the index/delete operation. + +`refresh`:: Refresh the index immediately after the operation occurs, + so that the updated document appears in search results + immediately. + +`fields`:: return the relevant fields from the updated document. + Support `_source` to return the full updated + source. + + +And also support `retry_on_conflict` which controls how many times to +retry if there is a version conflict between getting the document and +indexing / deleting it. Defaults to `0`. + +It also allows to update the `ttl` of a document using `ctx._ttl` and +timestamp using `ctx._timestamp`. Note that if the timestamp is not +updated and not extracted from the `_source` it will be set to the +update date. diff --git a/docs/reference/glossary.asciidoc b/docs/reference/glossary.asciidoc new file mode 100644 index 0000000..6f7061f --- /dev/null +++ b/docs/reference/glossary.asciidoc @@ -0,0 +1,190 @@ +[glossary] +[[glossary]] += Glossary of terms + +[glossary] +[[glossary-analysis]] analysis :: + + Analysis is the process of converting <<glossary-text,full text>> to + <<glossary-term,terms>>. Depending on which analyzer is used, these phrases: + `FOO BAR`, `Foo-Bar`, `foo,bar` will probably all result in the + terms `foo` and `bar`. These terms are what is actually stored in + the index. + + + A full text query (not a <<glossary-term,term>> query) for `FoO:bAR` will + also be analyzed to the terms `foo`,`bar` and will thus match the + terms stored in the index. + + + It is this process of analysis (both at index time and at search time) + that allows elasticsearch to perform full text queries. + + + Also see <<glossary-text,text>> and <<glossary-term,term>>. + +[[glossary-cluster]] cluster :: + + A cluster consists of one or more <<glossary-node,nodes>> which share the + same cluster name. Each cluster has a single master node which is + chosen automatically by the cluster and which can be replaced if the + current master node fails. + +[[glossary-document]] document :: + + A document is a JSON document which is stored in elasticsearch. It is + like a row in a table in a relational database. Each document is + stored in an <<glossary-index,index>> and has a <<glossary-type,type>> and an + <<glossary-id,id>>. + + + A document is a JSON object (also known in other languages as a hash / + hashmap / associative array) which contains zero or more + <<glossary-field,fields>>, or key-value pairs. + + + The original JSON document that is indexed will be stored in the + <<glossary-source_field,`_source` field>>, which is returned by default when + getting or searching for a document. + +[[glossary-id]] id :: + + The ID of a <<glossary-document,document>> identifies a document. The + `index/type/id` of a document must be unique. If no ID is provided, + then it will be auto-generated. (also see <<glossary-routing,routing>>) + +[[glossary-field]] field :: + + A <<glossary-document,document>> contains a list of fields, or key-value + pairs. The value can be a simple (scalar) value (eg a string, integer, + date), or a nested structure like an array or an object. A field is + similar to a column in a table in a relational database. + + + The <<glossary-mapping,mapping>> for each field has a field _type_ (not to + be confused with document <<glossary-type,type>>) which indicates the type + of data that can be stored in that field, eg `integer`, `string`, + `object`. The mapping also allows you to define (amongst other things) + how the value for a field should be analyzed. + +[[glossary-index]] index :: + + An index is like a _database_ in a relational database. It has a + <<glossary-mapping,mapping>> which defines multiple <<glossary-type,types>>. + + + An index is a logical namespace which maps to one or more + <<glossary-primary-shard,primary shards>> and can have zero or more + <<glossary-replica-shard,replica shards>>. + +[[glossary-mapping]] mapping :: + + A mapping is like a _schema definition_ in a relational database. Each + <<glossary-index,index>> has a mapping, which defines each <<glossary-type,type>> + within the index, plus a number of index-wide settings. + + + A mapping can either be defined explicitly, or it will be generated + automatically when a document is indexed. + +[[glossary-node]] node :: + + A node is a running instance of elasticsearch which belongs to a + <<glossary-cluster,cluster>>. Multiple nodes can be started on a single + server for testing purposes, but usually you should have one node per + server. + + + At startup, a node will use unicast (or multicast, if specified) to + discover an existing cluster with the same cluster name and will try + to join that cluster. + + [[glossary-primary-shard]] primary shard :: + + Each document is stored in a single primary <<glossary-shard,shard>>. When + you index a document, it is indexed first on the primary shard, then + on all <<glossary-replica-shard,replicas>> of the primary shard. + + + By default, an <<glossary-index,index>> has 5 primary shards. You can + specify fewer or more primary shards to scale the number of + <<glossary-document,documents>> that your index can handle. + + + You cannot change the number of primary shards in an index, once the + index is created. + + + See also <<glossary-routing,routing>> + + [[glossary-replica-shard]] replica shard :: + + Each <<glossary-primary-shard,primary shard>> can have zero or more + replicas. A replica is a copy of the primary shard, and has two + purposes: + + + 1. increase failover: a replica shard can be promoted to a primary + shard if the primary fails + 2. increase performance: get and search requests can be handled by + primary or replica shards. + + + By default, each primary shard has one replica, but the number of + replicas can be changed dynamically on an existing index. A replica + shard will never be started on the same node as its primary shard. + +[[glossary-routing]] routing :: + + When you index a document, it is stored on a single + <<glossary-primary-shard,primary shard>>. That shard is chosen by hashing + the `routing` value. By default, the `routing` value is derived from + the ID of the document or, if the document has a specified parent + document, from the ID of the parent document (to ensure that child and + parent documents are stored on the same shard). + + + This value can be overridden by specifying a `routing` value at index + time, or a <<mapping-routing-field,routing + field>> in the <<glossary-mapping,mapping>>. + +[[glossary-shard]] shard :: + + A shard is a single Lucene instance. It is a low-level “worker” unit + which is managed automatically by elasticsearch. An index is a logical + namespace which points to <<glossary-primary-shard,primary>> and + <<glossary-replica-shard,replica>> shards. + + + Other than defining the number of primary and replica shards that an + index should have, you never need to refer to shards directly. + Instead, your code should deal only with an index. + + + Elasticsearch distributes shards amongst all <<glossary-node,nodes>> in the + <<glossary-cluster,cluster>>, and can move shards automatically from one + node to another in the case of node failure, or the addition of new + nodes. + + [[glossary-source_field]] source field :: + + By default, the JSON document that you index will be stored in the + `_source` field and will be returned by all get and search requests. + This allows you access to the original object directly from search + results, rather than requiring a second step to retrieve the object + from an ID. + + + Note: the exact JSON string that you indexed will be returned to you, + even if it contains invalid JSON. The contents of this field do not + indicate anything about how the data in the object has been indexed. + +[[glossary-term]] term :: + + A term is an exact value that is indexed in elasticsearch. The terms + `foo`, `Foo`, `FOO` are NOT equivalent. Terms (i.e. exact values) can + be searched for using _term_ queries. + + See also <<glossary-text,text>> and <<glossary-analysis,analysis>>. + +[[glossary-text]] text :: + + Text (or full text) is ordinary unstructured text, such as this + paragraph. By default, text will be <<glossary-analysis,analyzed>> into + <<glossary-term,terms>>, which is what is actually stored in the index. + + + Text <<glossary-field,fields>> need to be analyzed at index time in order to + be searchable as full text, and keywords in full text queries must be + analyzed at search time to produce (and search for) the same terms + that were generated at index time. + + + See also <<glossary-term,term>> and <<glossary-analysis,analysis>>. + +[[glossary-type]] type :: + + A type is like a _table_ in a relational database. Each type has a + list of <<glossary-field,fields>> that can be specified for + <<glossary-document,documents>> of that type. The <<glossary-mapping,mapping>> + defines how each field in the document is analyzed. + diff --git a/docs/reference/images/Exponential.png b/docs/reference/images/Exponential.png Binary files differnew file mode 100644 index 0000000..e4bab5c --- /dev/null +++ b/docs/reference/images/Exponential.png diff --git a/docs/reference/images/Gaussian.png b/docs/reference/images/Gaussian.png Binary files differnew file mode 100644 index 0000000..ec88565 --- /dev/null +++ b/docs/reference/images/Gaussian.png diff --git a/docs/reference/images/Linear.png b/docs/reference/images/Linear.png Binary files differnew file mode 100644 index 0000000..38718ca --- /dev/null +++ b/docs/reference/images/Linear.png diff --git a/docs/reference/images/service-manager-win.png b/docs/reference/images/service-manager-win.png Binary files differnew file mode 100644 index 0000000..7b99220 --- /dev/null +++ b/docs/reference/images/service-manager-win.png diff --git a/docs/reference/index-modules.asciidoc b/docs/reference/index-modules.asciidoc new file mode 100644 index 0000000..49d6cc3 --- /dev/null +++ b/docs/reference/index-modules.asciidoc @@ -0,0 +1,81 @@ +[[index-modules]] += Index Modules + +[partintro] +-- +Index Modules are modules created per index and control all aspects +related to an index. Since those modules lifecycle are tied to an index, +all the relevant modules settings can be provided when creating an index +(and it is actually the recommended way to configure an index). + +[float] +[[index-modules-settings]] +== Index Settings + +There are specific index level settings that are not associated with any +specific module. These include: + +[[index-compound-format]]`index.compound_format`:: + + Should the compound file format be used (boolean setting). + The compound format was created to reduce the number of open + file handles when using file based storage. However, by default it is set + to `false` as the non-compound format gives better performance. It is important + that OS is configured to give Elasticsearch ``enough'' file handles. + See <<file-descriptors>>. ++ +Alternatively, `compound_format` can be set to a number between `0` and +`1`, where `0` means `false`, `1` means `true` and a number inbetween +represents a percentage: if the merged segment is less than this +percentage of the total index, then it is written in compound format, +otherwise it is written in non-compound format. + +[[index-compound-on-flush]]`index.compound_on_flush`:: + + Should a new segment (create by indexing, not by merging) be written + in compound format or non-compound format? Defaults to `true`. + This is a dynamic setting. + +`index.refresh_interval`:: + A time setting controlling how often the + refresh operation will be executed. Defaults to `1s`. Can be set to `-1` + in order to disable it. + +`index.shard.check_on_startup`:: + Should shard consistency be checked upon opening. + When `true`, the shard will be checked, preventing it from being open in + case some segments appear to be corrupted. + When `fix`, the shard will also be checked but segments that were reported + as corrupted will be automatically removed. + Default value is `false`, which doesn't check shards. + +NOTE: Checking shards may take a lot of time on large indices. + +WARNING: Setting `index.shard.check_on_startup` to `fix` may result in data loss, + use with caution. + +-- + +include::index-modules/analysis.asciidoc[] + +include::index-modules/allocation.asciidoc[] + +include::index-modules/slowlog.asciidoc[] + +include::index-modules/merge.asciidoc[] + +include::index-modules/store.asciidoc[] + +include::index-modules/mapper.asciidoc[] + +include::index-modules/translog.asciidoc[] + +include::index-modules/cache.asciidoc[] + +include::index-modules/fielddata.asciidoc[] + +include::index-modules/codec.asciidoc[] + +include::index-modules/similarity.asciidoc[] + + diff --git a/docs/reference/index-modules/allocation.asciidoc b/docs/reference/index-modules/allocation.asciidoc new file mode 100644 index 0000000..c1a1618 --- /dev/null +++ b/docs/reference/index-modules/allocation.asciidoc @@ -0,0 +1,136 @@ +[[index-modules-allocation]] +== Index Shard Allocation + +[float] +[[shard-allocation-filtering]] +=== Shard Allocation Filtering + +Allow to control allocation if indices on nodes based on include/exclude +filters. The filters can be set both on the index level and on the +cluster level. Lets start with an example of setting it on the cluster +level: + +Lets say we have 4 nodes, each has specific attribute called `tag` +associated with it (the name of the attribute can be any name). Each +node has a specific value associated with `tag`. Node 1 has a setting +`node.tag: value1`, Node 2 a setting of `node.tag: value2`, and so on. + +We can create an index that will only deploy on nodes that have `tag` +set to `value1` and `value2` by setting +`index.routing.allocation.include.tag` to `value1,value2`. For example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index.routing.allocation.include.tag" : "value1,value2" +}' +-------------------------------------------------- + +On the other hand, we can create an index that will be deployed on all +nodes except for nodes with a `tag` of value `value3` by setting +`index.routing.allocation.exclude.tag` to `value3`. For example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index.routing.allocation.exclude.tag" : "value3" +}' +-------------------------------------------------- + +`index.routing.allocation.require.*` can be used to +specify a number of rules, all of which MUST match in order for a shard +to be allocated to a node. This is in contrast to `include` which will +include a node if ANY rule matches. + +The `include`, `exclude` and `require` values can have generic simple +matching wildcards, for example, `value1*`. A special attribute name +called `_ip` can be used to match on node ip values. + +Obviously a node can have several attributes associated with it, and +both the attribute name and value are controlled in the setting. For +example, here is a sample of several node configurations: + +[source,js] +-------------------------------------------------- +node.group1: group1_value1 +node.group2: group2_value4 +-------------------------------------------------- + +In the same manner, `include`, `exclude` and `require` can work against +several attributes, for example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index.routing.allocation.include.group1" : "xxx" + "index.routing.allocation.include.group2" : "yyy", + "index.routing.allocation.exclude.group3" : "zzz", + "index.routing.allocation.require.group4" : "aaa", +}' +-------------------------------------------------- + +The provided settings can also be updated in real time using the update +settings API, allowing to "move" indices (shards) around in realtime. + +Cluster wide filtering can also be defined, and be updated in real time +using the cluster update settings API. This setting can come in handy +for things like decommissioning nodes (even if the replica count is set +to 0). Here is a sample of how to decommission a node based on `_ip` +address: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_cluster/settings -d '{ + "transient" : { + "cluster.routing.allocation.exclude._ip" : "10.0.0.1" + } +}' +-------------------------------------------------- + +[float] +=== Total Shards Per Node + +The `index.routing.allocation.total_shards_per_node` setting allows to +control how many total shards for an index will be allocated per node. +It can be dynamically set on a live index using the update index +settings API. + +[float] +[[disk]] +=== Disk-based Shard Allocation + +Elasticsearch con be configured to prevent shard +allocation on nodes depending on disk usage for the node. This +functionality is disabled by default, and can be changed either in the +configuration file, or dynamically using: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_cluster/settings -d '{ + "transient" : { + "cluster.routing.allocation.disk.threshold_enabled" : true + } +}' +-------------------------------------------------- + +Once enabled, Elasticsearch uses two watermarks to decide whether +shards should be allocated or can remain on the node. + +`cluster.routing.allocation.disk.watermark.low` controls the low +watermark for disk usage. It defaults to 0.70, meaning ES will not +allocate new shards to nodes once they have more than 70% disk +used. It can also be set to an absolute byte value (like 500mb) to +prevent ES from allocating shards if less than the configured amount +of space is available. + +`cluster.routing.allocation.disk.watermark.high` controls the high +watermark. It defaults to 0.85, meaning ES will attempt to relocate +shards to another node if the node disk usage rises above 85%. It can +also be set to an absolute byte value (similar to the low watermark) +to relocate shards once less than the configured amount of space is +available on the node. + +Both watermark settings can be changed dynamically using the cluster +settings API. By default, Elasticsearch will retrieve information +about the disk usage of the nodes every 30 seconds. This can also be +changed by setting the `cluster.info.update.interval` setting. diff --git a/docs/reference/index-modules/analysis.asciidoc b/docs/reference/index-modules/analysis.asciidoc new file mode 100644 index 0000000..1cf33e8 --- /dev/null +++ b/docs/reference/index-modules/analysis.asciidoc @@ -0,0 +1,18 @@ +[[index-modules-analysis]] +== Analysis + +The index analysis module acts as a configurable registry of Analyzers +that can be used in order to both break indexed (analyzed) fields when a +document is indexed and process query strings. It maps to the Lucene +`Analyzer`. + +Analyzers are (generally) composed of a single `Tokenizer` and zero or +more `TokenFilters`. A set of `CharFilters` can be associated with an +analyzer to process the characters prior to other analysis steps. The +analysis module allows one to register `TokenFilters`, `Tokenizers` and +`Analyzers` under logical names that can then be referenced either in +mapping definitions or in certain APIs. The Analysis module +automatically registers (*if not explicitly defined*) built in +analyzers, token filters, and tokenizers. + +See <<analysis>> for configuration details.
\ No newline at end of file diff --git a/docs/reference/index-modules/cache.asciidoc b/docs/reference/index-modules/cache.asciidoc new file mode 100644 index 0000000..829091e --- /dev/null +++ b/docs/reference/index-modules/cache.asciidoc @@ -0,0 +1,56 @@ +[[index-modules-cache]] +== Cache + +There are different caching inner modules associated with an index. They +include `filter` and others. + +[float] +[[filter]] +=== Filter Cache + +The filter cache is responsible for caching the results of filters (used +in the query). The default implementation of a filter cache (and the one +recommended to use in almost all cases) is the `node` filter cache type. + +[float] +[[node-filter]] +==== Node Filter Cache + +The `node` filter cache may be configured to use either a percentage of +the total memory allocated to the process or an specific amount of +memory. All shards present on a node share a single node cache (thats +why its called `node``). The cache implements an LRU eviction policy: +when a cache becomes full, the least recently used data is evicted to +make way for new data. + +The setting that allows one to control the memory size for the filter +cache is `indices.cache.filter.size`, which defaults to `20%`. *Note*, +this is *not* an index level setting but a node level setting (can be +configured in the node configuration). + +`indices.cache.filter.size` can accept either a percentage value, like +`30%`, or an exact value, like `512mb`. + +[float] +[[index-filter]] +==== Index Filter Cache + +A filter cache that exists on the index level (on each node). Generally, +not recommended for use since its memory usage depends on which shards +are allocated on each node and its hard to predict it. The types are: +`resident`, `soft` and `weak`. + +All types support the following settings: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`index.cache.filter.max_size` |The max size (count, not byte size) of +the cache (per search segment in a shard). Defaults to not set (`-1`), +which is usually fine with `soft` cache and proper cacheable filters. + +|`index.cache.filter.expire` |A time based setting that expires filters +after a certain time of inactivity. Defaults to `-1`. For example, can +be set to `5m` for a 5 minute expiry. +|======================================================================= + diff --git a/docs/reference/index-modules/codec.asciidoc b/docs/reference/index-modules/codec.asciidoc new file mode 100644 index 0000000..f53c18f --- /dev/null +++ b/docs/reference/index-modules/codec.asciidoc @@ -0,0 +1,278 @@ +[[index-modules-codec]] +== Codec module + +Codecs define how documents are written to disk and read from disk. The +postings format is the part of the codec that responsible for reading +and writing the term dictionary, postings lists and positions, payloads +and offsets stored in the postings list. The doc values format is +responsible for reading column-stride storage for a field and is typically +used for sorting or faceting. When a field doesn't have doc values enabled, +it is still possible to sort or facet by loading field values from the +inverted index into main memory. + +Configuring custom postings or doc values formats is an expert feature and +most likely using the builtin formats will suit your needs as is described +in the <<mapping-core-types,mapping section>>. + +********************************** +Only the default codec, postings format and doc values format are supported: +other formats may break backward compatibility between minor versions of +Elasticsearch, requiring data to be reindexed. +********************************** + + +[float] +[[custom-postings]] +=== Configuring a custom postings format + +Custom postings format can be defined in the index settings in the +`codec` part. The `codec` part can be configured when creating an index +or updating index settings. An example on how to define your custom +postings format: + +[source,js] +-------------------------------------------------- +curl -XPUT 'http://localhost:9200/twitter/' -d '{ + "settings" : { + "index" : { + "codec" : { + "postings_format" : { + "my_format" : { + "type" : "pulsing", + "freq_cut_off" : "5" + } + } + } + } + } +}' +-------------------------------------------------- + +Then we defining your mapping your can use the `my_format` name in the +`postings_format` option as the example below illustrates: + +[source,js] +-------------------------------------------------- +{ + "person" : { + "properties" : { + "second_person_id" : {"type" : "string", "postings_format" : "my_format"} + } + } +} +-------------------------------------------------- + +[float] +=== Available postings formats + +[float] +[[direct-postings]] +==== Direct postings format + +Wraps the default postings format for on-disk storage, but then at read +time loads and stores all terms & postings directly in RAM. This +postings format makes no effort to compress the terms and posting list +and therefore is memory intensive, but because of this it gives a +substantial increase in search performance. Because this holds all term +bytes as a single byte[], you cannot have more than 2.1GB worth of terms +in a single segment. + +This postings format offers the following parameters: + +`min_skip_count`:: + The minimum number terms with a shared prefix to + allow a skip pointer to be written. The default is *8*. + +`low_freq_cutoff`:: + Terms with a lower document frequency use a + single array object representation for postings and positions. The + default is *32*. + +Type name: `direct` + +[float] +[[memory-postings]] +==== Memory postings format + +A postings format that stores terms & postings (docs, positions, +payloads) in RAM, using an FST. This postings format does write to disk, +but loads everything into memory. The memory postings format has the +following options: + +`pack_fst`:: + A boolean option that defines if the in memory structure + should be packed once its build. Packed will reduce the size for the + data-structure in memory but requires more memory during building. + Default is *false*. + +`acceptable_overhead_ratio`:: + The compression ratio specified as a + float, that is used to compress internal structures. Example ratios `0` + (Compact, no memory overhead at all, but the returned implementation may + be slow), `0.5` (Fast, at most 50% memory overhead, always select a + reasonably fast implementation), `7` (Fastest, at most 700% memory + overhead, no compression). Default is `0.2`. + +Type name: `memory` + +[float] +[[bloom-postings]] +==== Bloom filter posting format + +The bloom filter postings format wraps a delegate postings format and on +top of this creates a bloom filter that is written to disk. During +opening this bloom filter is loaded into memory and used to offer +"fast-fail" reads. This postings format is useful for low doc-frequency +fields such as primary keys. The bloom filter postings format has the +following options: + +`delegate`:: + The name of the configured postings format that the + bloom filter postings format will wrap. + +`fpp`:: + The desired false positive probability specified as a + floating point number between 0 and 1.0. The `fpp` can be configured for + multiple expected insertions. Example expression: *10k=0.01,1m=0.03*. If + number docs per index segment is larger than *1m* then use *0.03* as fpp + and if number of docs per segment is larger than *10k* use *0.01* as + fpp. The last fallback value is always *0.03*. This example expression + is also the default. + +Type name: `bloom` + +[[codec-bloom-load]] +[TIP] +================================================== + +It can sometime make sense to disable bloom filters. For instance, if you are +logging into an index per day, and you have thousands of indices, the bloom +filters can take up a sizable amount of memory. For most queries you are only +interested in recent indices, so you don't mind CRUD operations on older +indices taking slightly longer. + +In these cases you can disable loading of the bloom filter on a per-index +basis by updating the index settings: + +[source,js] +-------------------------------------------------- +PUT /old_index/_settings?index.codec.bloom.load=false +-------------------------------------------------- + +This setting, which defaults to `true`, can be updated on a live index. Note, +however, that changing the value will cause the index to be reopened, which +will invalidate any existing caches. + +================================================== + +[float] +[[pulsing-postings]] +==== Pulsing postings format + +The pulsing implementation in-lines the posting lists for very low +frequent terms in the term dictionary. This is useful to improve lookup +performance for low-frequent terms. This postings format offers the +following parameters: + +`min_block_size`:: + The minimum block size the default Lucene term + dictionary uses to encode on-disk blocks. Defaults to *25*. + +`max_block_size`:: + The maximum block size the default Lucene term + dictionary uses to encode on-disk blocks. Defaults to *48*. + +`freq_cut_off`:: + The document frequency cut off where pulsing + in-lines posting lists into the term dictionary. Terms with a document + frequency less or equal to the cutoff will be in-lined. The default is + *1*. + +Type name: `pulsing` + +[float] +[[default-postings]] +==== Default postings format + +The default postings format has the following options: + +`min_block_size`:: + The minimum block size the default Lucene term + dictionary uses to encode on-disk blocks. Defaults to *25*. + +`max_block_size`:: + The maximum block size the default Lucene term + dictionary uses to encode on-disk blocks. Defaults to *48*. + +Type name: `default` + +[float] +=== Configuring a custom doc values format + +Custom doc values format can be defined in the index settings in the +`codec` part. The `codec` part can be configured when creating an index +or updating index settings. An example on how to define your custom +doc values format: + +[source,js] +-------------------------------------------------- +curl -XPUT 'http://localhost:9200/twitter/' -d '{ + "settings" : { + "index" : { + "codec" : { + "doc_values_format" : { + "my_format" : { + "type" : "disk" + } + } + } + } + } +}' +-------------------------------------------------- + +Then we defining your mapping your can use the `my_format` name in the +`doc_values_format` option as the example below illustrates: + +[source,js] +-------------------------------------------------- +{ + "product" : { + "properties" : { + "price" : {"type" : "integer", "doc_values_format" : "my_format"} + } + } +} +-------------------------------------------------- + +[float] +=== Available doc values formats + +[float] +==== Memory doc values format + +A doc values format that stores all values in a FST in RAM. This format does +write to disk but the whole data-structure is loaded into memory when reading +the index. The memory postings format has no options. + +Type name: `memory` + +[float] +==== Disk doc values format + +A doc values format that stores and reads everything from disk. Although it may +be slightly slower than the default doc values format, this doc values format +will require almost no memory from the JVM. The disk doc values format has no +options. + +Type name: `disk` + +[float] +==== Default doc values format + +The default doc values format tries to make a good compromise between speed and +memory usage by only loading into memory data-structures that matter for +performance. This makes this doc values format a good fit for most use-cases. +The default doc values format has no options. + +Type name: `default` diff --git a/docs/reference/index-modules/fielddata.asciidoc b/docs/reference/index-modules/fielddata.asciidoc new file mode 100644 index 0000000..c958dcb --- /dev/null +++ b/docs/reference/index-modules/fielddata.asciidoc @@ -0,0 +1,270 @@ +[[index-modules-fielddata]] +== Field data + +The field data cache is used mainly when sorting on or faceting on a +field. It loads all the field values to memory in order to provide fast +document based access to those values. The field data cache can be +expensive to build for a field, so its recommended to have enough memory +to allocate it, and to keep it loaded. + +The amount of memory used for the field +data cache can be controlled using `indices.fielddata.cache.size`. Note: +reloading the field data which does not fit into your cache will be expensive +and perform poorly. + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`indices.fielddata.cache.size` |The max size of the field data cache, +eg `30%` of node heap space, or an absolute value, eg `12GB`. Defaults +to unbounded. + +|`indices.fielddata.cache.expire` |A time based setting that expires +field data after a certain time of inactivity. Defaults to `-1`. For +example, can be set to `5m` for a 5 minute expiry. +|======================================================================= + +[float] +[[fielddata-circuit-breaker]] +=== Field data circuit breaker +The field data circuit breaker allows Elasticsearch to estimate the amount of +memory a field will required to be loaded into memory. It can then prevent the +field data loading by raising and exception. By default the limit is configured +to 80% of the maximum JVM heap. It can be configured with the following +parameters: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`indices.fielddata.breaker.limit` |Maximum size of estimated field data +to allow loading. Defaults to 80% of the maximum JVM heap. +|`indices.fielddata.breaker.overhead` |A constant that all field data +estimations are multiplied with to determine a final estimation. Defaults to +1.03 +|======================================================================= + +Both the `indices.fielddata.breaker.limit` and +`indices.fielddata.breaker.overhead` can be changed dynamically using the +cluster update settings API. + +[float] +[[fielddata-monitoring]] +=== Monitoring field data + +You can monitor memory usage for field data as well as the field data circuit +breaker using +<<cluster-nodes-stats,Nodes Stats API>> + +[[fielddata-formats]] +== Field data formats + +The field data format controls how field data should be stored. + +Depending on the field type, there might be several field data types +available. In particular, string and numeric types support the `doc_values` +format which allows for computing the field data data-structures at indexing +time and storing them on disk. Although it will make the index larger and may +be slightly slower, this implementation will be more near-realtime-friendly +and will require much less memory from the JVM than other implementations. + +Here is an example of how to configure the `tag` field to use the `fst` field +data format. + +[source,js] +-------------------------------------------------- +{ + tag: { + type: "string", + fielddata: { + format: "fst" + } + } +} +-------------------------------------------------- + +It is possible to change the field data format (and the field data settings +in general) on a live index by using the update mapping API. When doing so, +field data which had already been loaded for existing segments will remain +alive while new segments will use the new field data configuration. Thanks to +the background merging process, all segments will eventually use the new +field data format. + +[float] +==== String field data types + +`paged_bytes` (default):: + Stores unique terms sequentially in a large buffer and maps documents to + the indices of the terms they contain in this large buffer. + +`fst`:: + Stores terms in a FST. Slower to build than `paged_bytes` but can help lower + memory usage if many terms share common prefixes and/or suffixes. + +`doc_values`:: + Computes and stores field data data-structures on disk at indexing time. + Lowers memory usage but only works on non-analyzed strings (`index`: `no` or + `not_analyzed`) and doesn't support filtering. + +[float] +==== Numeric field data types + +`array` (default):: + Stores field values in memory using arrays. + +`doc_values`:: + Computes and stores field data data-structures on disk at indexing time. + Doesn't support filtering. + +[float] +==== Geo point field data types + +`array` (default):: + Stores latitudes and longitudes in arrays. + +`doc_values`:: + Computes and stores field data data-structures on disk at indexing time. + +[float] +=== Fielddata loading + +By default, field data is loaded lazily, ie. the first time that a query that +requires them is executed. However, this can make the first requests that +follow a merge operation quite slow since fielddata loading is a heavy +operation. + +It is possible to force field data to be loaded and cached eagerly through the +`loading` setting of fielddata: + +[source,js] +-------------------------------------------------- +{ + category: { + type: "string", + fielddata: { + loading: "eager" + } + } +} +-------------------------------------------------- + +[float] +==== Disabling field data loading + +Field data can take a lot of RAM so it makes sense to disable field data +loading on the fields that don't need field data, for example those that are +used for full-text search only. In order to disable field data loading, just +change the field data format to `disabled`. When disabled, all requests that +will try to load field data, e.g. when they include aggregations and/or sorting, +will return an error. + +[source,js] +-------------------------------------------------- +{ + text: { + type: "string", + fielddata: { + format: "disabled" + } + } +} +-------------------------------------------------- + +The `disabled` format is supported by all field types. + +[float] +[[field-data-filtering]] +=== Filtering fielddata + +It is possible to control which field values are loaded into memory, +which is particularly useful for string fields. When specifying the +<<mapping-core-types,mapping>> for a field, you +can also specify a fielddata filter. + +Fielddata filters can be changed using the +<<indices-put-mapping,PUT mapping>> +API. After changing the filters, use the +<<indices-clearcache,Clear Cache>> API +to reload the fielddata using the new filters. + +[float] +==== Filtering by frequency: + +The frequency filter allows you to only load terms whose frequency falls +between a `min` and `max` value, which can be expressed an absolute +number or as a percentage (eg `0.01` is `1%`). Frequency is calculated +*per segment*. Percentages are based on the number of docs which have a +value for the field, as opposed to all docs in the segment. + +Small segments can be excluded completely by specifying the minimum +number of docs that the segment should contain with `min_segment_size`: + +[source,js] +-------------------------------------------------- +{ + tag: { + type: "string", + fielddata: { + filter: { + frequency: { + min: 0.001, + max: 0.1, + min_segment_size: 500 + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Filtering by regex + +Terms can also be filtered by regular expression - only values which +match the regular expression are loaded. Note: the regular expression is +applied to each term in the field, not to the whole field value. For +instance, to only load hashtags from a tweet, we can use a regular +expression which matches terms beginning with `#`: + +[source,js] +-------------------------------------------------- +{ + tweet: { + type: "string", + analyzer: "whitespace" + fielddata: { + filter: { + regex: { + pattern: "^#.*" + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Combining filters + +The `frequency` and `regex` filters can be combined: + +[source,js] +-------------------------------------------------- +{ + tweet: { + type: "string", + analyzer: "whitespace" + fielddata: { + filter: { + regex: { + pattern: "^#.*", + }, + frequency: { + min: 0.001, + max: 0.1, + min_segment_size: 500 + } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/index-modules/mapper.asciidoc b/docs/reference/index-modules/mapper.asciidoc new file mode 100644 index 0000000..1728969 --- /dev/null +++ b/docs/reference/index-modules/mapper.asciidoc @@ -0,0 +1,39 @@ +[[index-modules-mapper]] +== Mapper + +The mapper module acts as a registry for the type mapping definitions +added to an index either when creating it or by using the put mapping +api. It also handles the dynamic mapping support for types that have no +explicit mappings pre defined. For more information about mapping +definitions, check out the <<mapping,mapping section>>. + +[float] +=== Dynamic / Default Mappings + +Dynamic mappings allow to automatically apply generic mapping definition +to types that do not have mapping pre defined or applied to new mapping +definitions (overridden). This is mainly done thanks to the fact that +the `object` type and namely the root `object` type allow for schema +less dynamic addition of unmapped fields. + +The default mapping definition is plain mapping definition that is +embedded within Elasticsearch: + +[source,js] +-------------------------------------------------- +{ + _default_ : { + } +} +-------------------------------------------------- + +Pretty short, no? Basically, everything is defaulted, especially the +dynamic nature of the root object mapping. The default mapping +definition can be overridden in several manners. The simplest manner is +to simply define a file called `default-mapping.json` and placed it +under the `config` directory (which can be configured to exist in a +different location). It can also be explicitly set using the +`index.mapper.default_mapping_location` setting. + +Dynamic creation of mappings for unmapped types can be completely +disabled by setting `index.mapper.dynamic` to `false`. diff --git a/docs/reference/index-modules/merge.asciidoc b/docs/reference/index-modules/merge.asciidoc new file mode 100644 index 0000000..84d2675 --- /dev/null +++ b/docs/reference/index-modules/merge.asciidoc @@ -0,0 +1,215 @@ +[[index-modules-merge]] +== Merge + +A shard in elasticsearch is a Lucene index, and a Lucene index is broken +down into segments. Segments are internal storage elements in the index +where the index data is stored, and are immutable up to delete markers. +Segments are, periodically, merged into larger segments to keep the +index size at bay and expunge deletes. + +The more segments one has in the Lucene index means slower searches and +more memory used. Segment merging is used to reduce the number of segments, +however merges can be expensive to perform, especially on low IO environments. +Merges can be throttled using <<store-throttling,store level throttling>>. + + +[float] +[[policy]] +=== Policy + +The index merge policy module allows one to control which segments of a +shard index are to be merged. There are several types of policies with +the default set to `tiered`. + +[float] +[[tiered]] +==== tiered + +Merges segments of approximately equal size, subject to an allowed +number of segments per tier. This is similar to `log_bytes_size` merge +policy, except this merge policy is able to merge non-adjacent segment, +and separates how many segments are merged at once from how many +segments are allowed per tier. This merge policy also does not +over-merge (i.e., cascade merges). + +This policy has the following settings: + +`index.merge.policy.expunge_deletes_allowed`:: + + When expungeDeletes is called, we only merge away a segment if its delete + percentage is over this threshold. Default is `10`. + +`index.merge.policy.floor_segment`:: + + Segments smaller than this are "rounded up" to this size, i.e. treated as + equal (floor) size for merge selection. This is to prevent frequent + flushing of tiny segments from allowing a long tail in the index. Default + is `2mb`. + +`index.merge.policy.max_merge_at_once`:: + + Maximum number of segments to be merged at a time during "normal" merging. + Default is `10`. + +`index.merge.policy.max_merge_at_once_explicit`:: + + Maximum number of segments to be merged at a time, during optimize or + expungeDeletes. Default is `30`. + +`index.merge.policy.max_merged_segment`:: + + Maximum sized segment to produce during normal merging (not explicit + optimize). This setting is approximate: the estimate of the merged segment + size is made by summing sizes of to-be-merged segments (compensating for + percent deleted docs). Default is `5gb`. + +`index.merge.policy.segments_per_tier`:: + + Sets the allowed number of segments per tier. Smaller values mean more + merging but fewer segments. Default is `10`. Note, this value needs to be + >= then the `max_merge_at_once` otherwise you'll force too many merges to + occur. + +`index.reclaim_deletes_weight`:: + + Controls how aggressively merges that reclaim more deletions are favored. + Higher values favor selecting merges that reclaim deletions. A value of + `0.0` means deletions don't impact merge selection. Defaults to `2.0`. + +`index.compound_format`:: + + Should the index be stored in compound format or not. Defaults to `false`. + See <<index-compound-format,`index.compound_format`>> in + <<index-modules-settings>>. + +For normal merging, this policy first computes a "budget" of how many +segments are allowed by be in the index. If the index is over-budget, +then the policy sorts segments by decreasing size (pro-rating by percent +deletes), and then finds the least-cost merge. Merge cost is measured by +a combination of the "skew" of the merge (size of largest seg divided by +smallest seg), total merge size and pct deletes reclaimed, so that +merges with lower skew, smaller size and those reclaiming more deletes, +are favored. + +If a merge will produce a segment that's larger than +`max_merged_segment` then the policy will merge fewer segments (down to +1 at once, if that one has deletions) to keep the segment size under +budget. + +Note, this can mean that for large shards that holds many gigabytes of +data, the default of `max_merged_segment` (`5gb`) can cause for many +segments to be in an index, and causing searches to be slower. Use the +indices segments API to see the segments that an index have, and +possibly either increase the `max_merged_segment` or issue an optimize +call for the index (try and aim to issue it on a low traffic time). + +[float] +[[log-byte-size]] +==== log_byte_size + +A merge policy that merges segments into levels of exponentially +increasing *byte size*, where each level has fewer segments than the +value of the merge factor. Whenever extra segments (beyond the merge +factor upper bound) are encountered, all segments within the level are +merged. + +This policy has the following settings: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|index.merge.policy.merge_factor |Determines how often segment indices +are merged by index operation. With smaller values, less RAM is used +while indexing, and searches on unoptimized indices are faster, but +indexing speed is slower. With larger values, more RAM is used during +indexing, and while searches on unoptimized indices are slower, indexing +is faster. Thus larger values (greater than 10) are best for batch index +creation, and smaller values (lower than 10) for indices that are +interactively maintained. Defaults to `10`. + +|index.merge.policy.min_merge_size |A size setting type which sets the +minimum size for the lowest level segments. Any segments below this size +are considered to be on the same level (even if they vary drastically in +size) and will be merged whenever there are mergeFactor of them. This +effectively truncates the "long tail" of small segments that would +otherwise be created into a single level. If you set this too large, it +could greatly increase the merging cost during indexing (if you flush +many small segments). Defaults to `1.6mb` + +|index.merge.policy.max_merge_size |A size setting type which sets the +largest segment (measured by total byte size of the segment's files) +that may be merged with other segments. Defaults to unbounded. + +|index.merge.policy.max_merge_docs |Determines the largest segment +(measured by document count) that may be merged with other segments. +Defaults to unbounded. +|======================================================================= + +[float] +[[log-doc]] +==== log_doc + +A merge policy that tries to merge segments into levels of exponentially +increasing *document count*, where each level has fewer segments than +the value of the merge factor. Whenever extra segments (beyond the merge +factor upper bound) are encountered, all segments within the level are +merged. + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|index.merge.policy.merge_factor |Determines how often segment indices +are merged by index operation. With smaller values, less RAM is used +while indexing, and searches on unoptimized indices are faster, but +indexing speed is slower. With larger values, more RAM is used during +indexing, and while searches on unoptimized indices are slower, indexing +is faster. Thus larger values (greater than 10) are best for batch index +creation, and smaller values (lower than 10) for indices that are +interactively maintained. Defaults to `10`. + +|index.merge.policy.min_merge_docs |Sets the minimum size for the lowest +level segments. Any segments below this size are considered to be on the +same level (even if they vary drastically in size) and will be merged +whenever there are mergeFactor of them. This effectively truncates the +"long tail" of small segments that would otherwise be created into a +single level. If you set this too large, it could greatly increase the +merging cost during indexing (if you flush many small segments). +Defaults to `1000`. + +|index.merge.policy.max_merge_docs |Determines the largest segment +(measured by document count) that may be merged with other segments. +Defaults to unbounded. +|======================================================================= + +[float] +[[scheduling]] +=== Scheduling + +The merge schedule controls the execution of merge operations once they +are needed (according to the merge policy). The following types are +supported, with the default being the `ConcurrentMergeScheduler`. + +[float] +==== ConcurrentMergeScheduler + +A merge scheduler that runs merges using a separated thread, until the +maximum number of threads at which when a merge is needed, the thread(s) +that are updating the index will pause until one or more merges +completes. + +The scheduler supports the following settings: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|index.merge.scheduler.max_thread_count |The maximum number of threads +to perform the merge operation. Defaults to +`Math.max(1, Math.min(3, Runtime.getRuntime().availableProcessors() / 2))`. +|======================================================================= + +[float] +==== SerialMergeScheduler + +A merge scheduler that simply does each merge sequentially using the +calling thread (blocking the operations that triggered the merge, the +index operation). diff --git a/docs/reference/index-modules/similarity.asciidoc b/docs/reference/index-modules/similarity.asciidoc new file mode 100644 index 0000000..ae9f368 --- /dev/null +++ b/docs/reference/index-modules/similarity.asciidoc @@ -0,0 +1,140 @@ +[[index-modules-similarity]] +== Similarity module + +A similarity (scoring / ranking model) defines how matching documents +are scored. Similarity is per field, meaning that via the mapping one +can define a different similarity per field. + +Configuring a custom similarity is considered a expert feature and the +builtin similarities are most likely sufficient as is described in the +<<mapping-core-types,mapping section>> + +[float] +[[configuration]] +=== Configuring a similarity + +Most existing or custom Similarities have configuration options which +can be configured via the index settings as shown below. The index +options can be provided when creating an index or updating index +settings. + +[source,js] +-------------------------------------------------- +"similarity" : { + "my_similarity" : { + "type" : "DFR", + "basic_model" : "g", + "after_effect" : "l", + "normalization" : "h2", + "normalization.h2.c" : "3.0" + } +} +-------------------------------------------------- + +Here we configure the DFRSimilarity so it can be referenced as +`my_similarity` in mappings as is illustrate in the below example: + +[source,js] +-------------------------------------------------- +{ + "book" : { + "properties" : { + "title" : { "type" : "string", "similarity" : "my_similarity" } + } +} +-------------------------------------------------- + +[float] +=== Available similarities + +[float] +[[default-similarity]] +==== Default similarity + +The default similarity that is based on the TF/IDF model. This +similarity has the following option: + +`discount_overlaps`:: + Determines whether overlap tokens (Tokens with + 0 position increment) are ignored when computing norm. By default this + is true, meaning overlap tokens do not count when computing norms. + +Type name: `default` + +[float] +[[bm25]] +==== BM25 similarity + +Another TF/IDF based similarity that has built-in tf normalization and +is supposed to work better for short fields (like names). See +http://en.wikipedia.org/wiki/Okapi_BM25[Okapi_BM25] for more details. +This similarity has the following options: + +[horizontal] +`k1`:: + Controls non-linear term frequency normalization + (saturation). + +`b`:: + Controls to what degree document length normalizes tf values. + +`discount_overlaps`:: + Determines whether overlap tokens (Tokens with + 0 position increment) are ignored when computing norm. By default this + is true, meaning overlap tokens do not count when computing norms. + +Type name: `BM25` + +[float] +[[drf]] +==== DFR similarity + +Similarity that implements the +http://lucene.apache.org/core/4_1_0/core/org/apache/lucene/search/similarities/DFRSimilarity.html[divergence +from randomness] framework. This similarity has the following options: + +[horizontal] +`basic_model`:: + Possible values: `be`, `d`, `g`, `if`, `in`, `ine` and `p`. + +`after_effect`:: + Possible values: `no`, `b` and `l`. + +`normalization`:: + Possible values: `no`, `h1`, `h2`, `h3` and `z`. + +All options but the first option need a normalization value. + +Type name: `DFR` + +[float] +[[ib]] +==== IB similarity. + +http://lucene.apache.org/core/4_1_0/core/org/apache/lucene/search/similarities/IBSimilarity.html[Information +based model] . This similarity has the following options: + +[horizontal] +`distribution`:: Possible values: `ll` and `spl`. +`lambda`:: Possible values: `df` and `ttf`. +`normalization`:: Same as in `DFR` similarity. + +Type name: `IB` + +[float] +[[default-base]] +==== Default and Base Similarities + +By default, Elasticsearch will use whatever similarity is configured as +`default`. However, the similarity functions `queryNorm()` and `coord()` +are not per-field. Consequently, for expert users wanting to change the +implementation used for these two methods, while not changing the +`default`, it is possible to configure a similarity with the name +`base`. This similarity will then be used for the two methods. + +You can change the default similarity for all fields like this: + +[source,js] +-------------------------------------------------- +index.similarity.default.type: BM25 +-------------------------------------------------- diff --git a/docs/reference/index-modules/slowlog.asciidoc b/docs/reference/index-modules/slowlog.asciidoc new file mode 100644 index 0000000..00029cf --- /dev/null +++ b/docs/reference/index-modules/slowlog.asciidoc @@ -0,0 +1,87 @@ +[[index-modules-slowlog]] +== Index Slow Log + +[float] +[[search-slow-log]] +=== Search Slow Log + +Shard level slow search log allows to log slow search (query and fetch +executions) into a dedicated log file. + +Thresholds can be set for both the query phase of the execution, and +fetch phase, here is a sample: + +[source,js] +-------------------------------------------------- +#index.search.slowlog.threshold.query.warn: 10s +#index.search.slowlog.threshold.query.info: 5s +#index.search.slowlog.threshold.query.debug: 2s +#index.search.slowlog.threshold.query.trace: 500ms + +#index.search.slowlog.threshold.fetch.warn: 1s +#index.search.slowlog.threshold.fetch.info: 800ms +#index.search.slowlog.threshold.fetch.debug: 500ms +#index.search.slowlog.threshold.fetch.trace: 200ms +-------------------------------------------------- + +By default, none are enabled (set to `-1`). Levels (`warn`, `info`, +`debug`, `trace`) allow to control under which logging level the log +will be logged. Not all are required to be configured (for example, only +`warn` threshold can be set). The benefit of several levels is the +ability to quickly "grep" for specific thresholds breached. + +The logging is done on the shard level scope, meaning the execution of a +search request within a specific shard. It does not encompass the whole +search request, which can be broadcast to several shards in order to +execute. Some of the benefits of shard level logging is the association +of the actual execution on the specific machine, compared with request +level. + +All settings are index level settings (and each index can have different +values for it), and can be changed in runtime using the index update +settings API. + +The logging file is configured by default using the following +configuration (found in `logging.yml`): + +[source,js] +-------------------------------------------------- +index_search_slow_log_file: + type: dailyRollingFile + file: ${path.logs}/${cluster.name}_index_search_slowlog.log + datePattern: "'.'yyyy-MM-dd" + layout: + type: pattern + conversionPattern: "[%d{ISO8601}][%-5p][%-25c] %m%n" +-------------------------------------------------- + +[float] +[[index-slow-log]] +=== Index Slow log + +p.The indexing slow log, similar in functionality to the search slow +log. The log file is ends with `_index_indexing_slowlog.log`. Log and +the thresholds are configured in the elasticsearch.yml file in the same +way as the search slowlog. Index slowlog sample: + +[source,js] +-------------------------------------------------- +#index.indexing.slowlog.threshold.index.warn: 10s +#index.indexing.slowlog.threshold.index.info: 5s +#index.indexing.slowlog.threshold.index.debug: 2s +#index.indexing.slowlog.threshold.index.trace: 500ms +-------------------------------------------------- + +The index slow log file is configured by default in the `logging.yml` +file: + +[source,js] +-------------------------------------------------- +index_indexing_slow_log_file: + type: dailyRollingFile + file: ${path.logs}/${cluster.name}_index_indexing_slowlog.log + datePattern: "'.'yyyy-MM-dd" + layout: + type: pattern + conversionPattern: "[%d{ISO8601}][%-5p][%-25c] %m%n" +-------------------------------------------------- diff --git a/docs/reference/index-modules/store.asciidoc b/docs/reference/index-modules/store.asciidoc new file mode 100644 index 0000000..8388ee2 --- /dev/null +++ b/docs/reference/index-modules/store.asciidoc @@ -0,0 +1,122 @@ +[[index-modules-store]] +== Store + +The store module allows you to control how index data is stored. + +The index can either be stored in-memory (no persistence) or on-disk +(the default). In-memory indices provide better performance at the cost +of limiting the index size to the amount of available physical memory. + +When using a local gateway (the default), file system storage with *no* +in memory storage is required to maintain index consistency. This is +required since the local gateway constructs its state from the local +index state of each node. + +Another important aspect of memory based storage is the fact that +Elasticsearch supports storing the index in memory *outside of the JVM +heap space* using the "Memory" (see below) storage type. It translates +to the fact that there is no need for extra large JVM heaps (with their +own consequences) for storing the index in memory. + + +[float] +[[store-throttling]] +=== Store Level Throttling + +The way Lucene, the IR library elasticsearch uses under the covers, +works is by creating immutable segments (up to deletes) and constantly +merging them (the merge policy settings allow to control how those +merges happen). The merge process happens in an asynchronous manner +without affecting the indexing / search speed. The problem though, +especially on systems with low IO, is that the merge process can be +expensive and affect search / index operation simply by the fact that +the box is now taxed with more IO happening. + +The store module allows to have throttling configured for merges (or +all) either on the node level, or on the index level. The node level +throttling will make sure that out of all the shards allocated on that +node, the merge process won't pass the specific setting bytes per +second. It can be set by setting `indices.store.throttle.type` to +`merge`, and setting `indices.store.throttle.max_bytes_per_sec` to +something like `5mb`. The node level settings can be changed dynamically +using the cluster update settings API. The default is set +to `20mb` with type `merge`. + +If specific index level configuration is needed, regardless of the node +level settings, it can be set as well using the +`index.store.throttle.type`, and +`index.store.throttle.max_bytes_per_sec`. The default value for the type +is `node`, meaning it will throttle based on the node level settings and +participate in the global throttling happening. Both settings can be set +using the index update settings API dynamically. + +The following sections lists all the different storage types supported. + +[float] +[[file-system]] +=== File System + +File system based storage is the default storage used. There are +different implementations or storage types. The best one for the +operating environment will be automatically chosen: `mmapfs` on +Solaris/Linux/Windows 64bit, `simplefs` on Windows 32bit, and +`niofs` for the rest. + +The following are the different file system based storage types: + +[float] +==== Simple FS + +The `simplefs` type is a straightforward implementation of file system +storage (maps to Lucene `SimpleFsDirectory`) using a random access file. +This implementation has poor concurrent performance (multiple threads +will bottleneck). It is usually better to use the `niofs` when you need +index persistence. + +[float] +==== NIO FS + +The `niofs` type stores the shard index on the file system (maps to +Lucene `NIOFSDirectory`) using NIO. It allows multiple threads to read +from the same file concurrently. It is not recommended on Windows +because of a bug in the SUN Java implementation. + +[[mmapfs]] +[float] +==== MMap FS + +The `mmapfs` type stores the shard index on the file system (maps to +Lucene `MMapDirectory`) by mapping a file into memory (mmap). Memory +mapping uses up a portion of the virtual memory address space in your +process equal to the size of the file being mapped. Before using this +class, be sure your have plenty of virtual address space. + +[float] +[[store-memory]] +=== Memory + +The `memory` type stores the index in main memory with the following +configuration options: + +There are also *node* level settings that control the caching of buffers +(important when using direct buffers): + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`cache.memory.direct` |Should the memory be allocated outside of the +JVM heap. Defaults to `true`. + +|`cache.memory.small_buffer_size` |The small buffer size, defaults to +`1kb`. + +|`cache.memory.large_buffer_size` |The large buffer size, defaults to +`1mb`. + +|`cache.memory.small_cache_size` |The small buffer cache size, defaults +to `10mb`. + +|`cache.memory.large_cache_size` |The large buffer cache size, defaults +to `500mb`. +|======================================================================= + diff --git a/docs/reference/index-modules/translog.asciidoc b/docs/reference/index-modules/translog.asciidoc new file mode 100644 index 0000000..e5215fe --- /dev/null +++ b/docs/reference/index-modules/translog.asciidoc @@ -0,0 +1,28 @@ +[[index-modules-translog]] +== Translog + +Each shard has a transaction log or write ahead log associated with it. +It allows to guarantee that when an index/delete operation occurs, it is +applied atomically, while not "committing" the internal Lucene index for +each request. A flush ("commit") still happens based on several +parameters: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|index.translog.flush_threshold_ops |After how many operations to flush. +Defaults to `5000`. + +|index.translog.flush_threshold_size |Once the translog hits this size, +a flush will happen. Defaults to `200mb`. + +|index.translog.flush_threshold_period |The period with no flush +happening to force a flush. Defaults to `30m`. + +|index.translog.interval |How often to check if a flush is needed, randomized +between the interval value and 2x the interval value. Defaults to `5s`. +|======================================================================= + +Note: these parameters can be updated at runtime using the Index +Settings Update API (for example, these number can be increased when +executing bulk updates to support higher TPS) diff --git a/docs/reference/index.asciidoc b/docs/reference/index.asciidoc new file mode 100644 index 0000000..1ae7a20 --- /dev/null +++ b/docs/reference/index.asciidoc @@ -0,0 +1,35 @@ +[[elasticsearch-reference]] += Reference + +include::setup.asciidoc[] + +include::migration/migrate_1_0.asciidoc[] + +include::api-conventions.asciidoc[] + +include::docs.asciidoc[] + +include::search.asciidoc[] + +include::indices.asciidoc[] + +include::cat.asciidoc[] + +include::cluster.asciidoc[] + +include::query-dsl.asciidoc[] + +include::mapping.asciidoc[] + +include::analysis.asciidoc[] + +include::modules.asciidoc[] + +include::index-modules.asciidoc[] + +include::testing.asciidoc[] + +include::glossary.asciidoc[] + + + diff --git a/docs/reference/indices.asciidoc b/docs/reference/indices.asciidoc new file mode 100644 index 0000000..70d801b --- /dev/null +++ b/docs/reference/indices.asciidoc @@ -0,0 +1,106 @@ +[[indices]] += Indices APIs + +[partintro] +-- +The indices APIs are used to manage individual indices, +index settings, aliases, mappings, index templates +and warmers. + +[float] +[[index-management]] +== Index management: + +* <<indices-create-index>> +* <<indices-delete-index>> +* <<indices-exists>> +* <<indices-open-close>> + +[float] +[[mapping-management]] +== Mapping management: + +* <<indices-put-mapping>> +* <<indices-get-mapping>> +* <<indices-get-field-mapping>> +* <<indices-delete-mapping>> +* <<indices-types-exists>> + +[float] +[[alias-management]] +== Alias management: +* <<indices-aliases>> + +[float] +[[index-settings]] +== Index settings: +* <<indices-update-settings>> +* <<indices-get-settings>> +* <<indices-analyze>> +* <<indices-templates>> +* <<indices-warmers>> + +[float] +[[monitoring]] +== Monitoring: +* <<indices-status>> +* <<indices-stats>> +* <<indices-segments>> + +[float] +[[status-management]] +== Status management: +* <<indices-clearcache>> +* <<indices-refresh>> +* <<indices-flush>> +* <<indices-optimize>> +* <<indices-gateway-snapshot>> + +-- + +include::indices/create-index.asciidoc[] + +include::indices/delete-index.asciidoc[] + +include::indices/indices-exists.asciidoc[] + +include::indices/open-close.asciidoc[] + +include::indices/put-mapping.asciidoc[] + +include::indices/get-mapping.asciidoc[] + +include::indices/get-field-mapping.asciidoc[] + +include::indices/types-exists.asciidoc[] + +include::indices/delete-mapping.asciidoc[] + +include::indices/aliases.asciidoc[] + +include::indices/update-settings.asciidoc[] + +include::indices/get-settings.asciidoc[] + +include::indices/analyze.asciidoc[] + +include::indices/templates.asciidoc[] + +include::indices/warmers.asciidoc[] + +include::indices/status.asciidoc[] + +include::indices/stats.asciidoc[] + +include::indices/segments.asciidoc[] + +include::indices/clearcache.asciidoc[] + +include::indices/flush.asciidoc[] + +include::indices/refresh.asciidoc[] + +include::indices/optimize.asciidoc[] + +include::indices/gateway-snapshot.asciidoc[] + diff --git a/docs/reference/indices/aliases.asciidoc b/docs/reference/indices/aliases.asciidoc new file mode 100644 index 0000000..53f484c --- /dev/null +++ b/docs/reference/indices/aliases.asciidoc @@ -0,0 +1,348 @@ +[[indices-aliases]] +== Index Aliases + +APIs in elasticsearch accept an index name when working against a +specific index, and several indices when applicable. The index aliases +API allow to alias an index with a name, with all APIs automatically +converting the alias name to the actual index name. An alias can also be +mapped to more than one index, and when specifying it, the alias will +automatically expand to the aliases indices. An alias can also be +associated with a filter that will automatically be applied when +searching, and routing values. + +Here is a sample of associating the alias `alias1` with index `test1`: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/_aliases' -d ' +{ + "actions" : [ + { "add" : { "index" : "test1", "alias" : "alias1" } } + ] +}' +-------------------------------------------------- + +An alias can also be removed, for example: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/_aliases' -d ' +{ + "actions" : [ + { "remove" : { "index" : "test1", "alias" : "alias1" } } + ] +}' +-------------------------------------------------- + +Renaming an alias is a simple `remove` then `add` operation within the +same API. This operation is atomic, no need to worry about a short +period of time where the alias does not point to an index: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/_aliases' -d ' +{ + "actions" : [ + { "remove" : { "index" : "test1", "alias" : "alias1" } }, + { "add" : { "index" : "test1", "alias" : "alias2" } } + ] +}' +-------------------------------------------------- + +Associating an alias with more than one index are simply several `add` +actions: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/_aliases' -d ' +{ + "actions" : [ + { "add" : { "index" : "test1", "alias" : "alias1" } }, + { "add" : { "index" : "test2", "alias" : "alias1" } } + ] +}' +-------------------------------------------------- + +It is an error to index to an alias which points to more than one index. + +[float] +[[filtered]] +=== Filtered Aliases + +Aliases with filters provide an easy way to create different "views" of +the same index. The filter can be defined using Query DSL and is applied +to all Search, Count, Delete By Query and More Like This operations with +this alias. Here is an example: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/_aliases' -d ' +{ + "actions" : [ + { + "add" : { + "index" : "test1", + "alias" : "alias2", + "filter" : { "term" : { "user" : "kimchy" } } + } + } + ] +}' +-------------------------------------------------- + +[float] +[[aliases-routing]] +==== Routing + +It is possible to associate routing values with aliases. This feature +can be used together with filtering aliases in order to avoid +unnecessary shard operations. + +The following command creates a new alias `alias1` that points to index +`test`. After `alias1` is created, all operations with this alias are +automatically modified to use value `1` for routing: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/_aliases' -d ' +{ + "actions" : [ + { + "add" : { + "index" : "test", + "alias" : "alias1", + "routing" : "1" + } + } + ] +}' +-------------------------------------------------- + +It's also possible to specify different routing values for searching +and indexing operations: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/_aliases' -d ' +{ + "actions" : [ + { + "add" : { + "index" : "test", + "alias" : "alias2", + "search_routing" : "1,2", + "index_routing" : "2" + } + } + ] +}' +-------------------------------------------------- + +As shown in the example above, search routing may contain several values +separated by comma. Index routing can contain only a single value. + +If an operation that uses routing alias also has a routing parameter, an +intersection of both alias routing and routing specified in the +parameter is used. For example the following command will use "2" as a +routing value: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/alias2/_search?q=user:kimchy&routing=2,3' +-------------------------------------------------- + +[float] +[[alias-adding]] +=== Add a single alias + +An alias can also be added with the endpoint + +`PUT /{index}/_alias/{name}` + + +where + +[horizontal] +`index`:: The index to alias refers to. Can be any of `blank | * | _all | glob pattern | name1, name2, …` +`name`:: The name of the alias. This is a required option. +`routing`:: An optional routing that can be associated with an alias. +`filter`:: An optional filter that can be associated with an alias. + +You can also use the plural `_aliases`. + +[float] +==== Examples: + +Adding time based alias: + +[source,js] +-------------------------------------------------- +curl -XPUT 'localhost:9200/logs_201305/_alias/2013' +-------------------------------------------------- + +Adding user alias: + +[source,js] +-------------------------------------------------- +curl -XPUT 'localhost:9200/users/_alias/user_12' -d '{ + "routing" : "12", + "filter" : { + "term" : { + "user_id" : 12 + } + } +}' +-------------------------------------------------- + +[float] +[[deleting]] +=== Delete aliases + + +The rest endpoint is: `/{index}/_alias/{name}` + +where + +[horizontal] +`index`:: `* | _all | glob pattern | name1, name2, …` +`name`:: `* | _all | glob pattern | name1, name2, …` + +Alternatively you can use the plural `_aliases`. Example: + +[source,js] +-------------------------------------------------- +curl -XDELETE 'localhost:9200/users/_alias/user_12' +-------------------------------------------------- + +[float] +[[alias-retrieving]] +=== Retrieving existing aliases + +The get index alias api allows to filter by +alias name and index name. This api redirects to the master and fetches +the requested index aliases, if available. This api only serialises the +found index aliases. + +Possible options: +[horizontal] +`index`:: + + The index name to get aliases for. Partially names are + supported via wildcards, also multiple index names can be specified + separated with a comma. Also the alias name for an index can be used. + +`alias`:: + The name of alias to return in the response. Like the index + option, this option supports wildcards and the option the specify + multiple alias names separated by a comma. + +`ignore_unavailable`:: + What to do is an specified index name doesn't + exist. If set to `true` then those indices are ignored. + +The rest endpoint is: `/{index}/_alias/{alias}`. + +[float] +==== Examples: + +All aliases for the index users: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/users/_alias/*' +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- + { + "users" : { + "aliases" : { + "user_13" : { + "filter" : { + "term" : { + "user_id" : 13 + } + }, + "index_routing" : "13", + "search_routing" : "13" + }, + "user_14" : { + "filter" : { + "term" : { + "user_id" : 14 + } + }, + "index_routing" : "14", + "search_routing" : "14" + }, + "user_12" : { + "filter" : { + "term" : { + "user_id" : 12 + } + }, + "index_routing" : "12", + "search_routing" : "12" + } + } + } +} +-------------------------------------------------- + +All aliases with the name 2013 in any index: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/_alias/2013' +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "logs_201304" : { + "aliases" : { + "2013" : { } + } + }, + "logs_201305" : { + "aliases" : { + "2013" : { } + } + } +} +-------------------------------------------------- + +All aliases that start with 2013_01 in any index: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/_alias/2013_01*' +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "logs_20130101" : { + "aliases" : { + "2013_01" : { } + } + } +} +-------------------------------------------------- + +There is also a HEAD variant of the get indices aliases api to check if +index aliases exist. The indices aliases exists api supports the same +option as the get indices aliases api. Examples: + +[source,js] +-------------------------------------------------- +curl -XHEAD 'localhost:9200/_alias/2013' +curl -XHEAD 'localhost:9200/_alias/2013_01*' +curl -XHEAD 'localhost:9200/users/_alias/*' +-------------------------------------------------- diff --git a/docs/reference/indices/analyze.asciidoc b/docs/reference/indices/analyze.asciidoc new file mode 100644 index 0000000..a9712d6 --- /dev/null +++ b/docs/reference/indices/analyze.asciidoc @@ -0,0 +1,50 @@ +[[indices-analyze]] +== Analyze + +Performs the analysis process on a text and return the tokens breakdown +of the text. + +Can be used without specifying an index against one of the many built in +analyzers: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/_analyze?analyzer=standard' -d 'this is a test' +-------------------------------------------------- + +Or by building a custom transient analyzer out of tokenizers and +filters: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/_analyze?tokenizer=keyword&filters=lowercase' -d 'this is a test' +-------------------------------------------------- + +It can also run against a specific index: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/test/_analyze?text=this+is+a+test' +-------------------------------------------------- + +The above will run an analysis on the "this is a test" text, using the +default index analyzer associated with the `test` index. An `analyzer` +can also be provided to use a different analyzer: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/test/_analyze?analyzer=whitespace' -d 'this is a test' +-------------------------------------------------- + +Also, the analyzer can be derived based on a field mapping, for example: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/test/_analyze?field=obj1.field1' -d 'this is a test' +-------------------------------------------------- + +Will cause the analysis to happen based on the analyzer configure in the +mapping for `obj1.field1` (and if not, the default index analyzer). + +Also, the text can be provided as part of the request body, and not as a +parameter. diff --git a/docs/reference/indices/clearcache.asciidoc b/docs/reference/indices/clearcache.asciidoc new file mode 100644 index 0000000..aed2470 --- /dev/null +++ b/docs/reference/indices/clearcache.asciidoc @@ -0,0 +1,34 @@ +[[indices-clearcache]] +== Clear Cache + +The clear cache API allows to clear either all caches or specific cached +associated with one ore more indices. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/_cache/clear' +-------------------------------------------------- + +The API, by default, will clear all caches. Specific caches can be +cleaned explicitly by setting `filter`, `field_data` or `id_cache` to +`true`. + +All caches relating to a specific field(s) can also be cleared by +specifying `fields` parameter with a comma delimited list of the +relevant fields. + +[float] +=== Multi Index + +The clear cache API can be applied to more than one index with a single +call, or even on `_all` the indices. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/kimchy,elasticsearch/_cache/clear' + +$ curl -XPOST 'http://localhost:9200/_cache/clear' +-------------------------------------------------- + +NOTE: The `filter` cache is not cleared immediately but is scheduled to be +cleared within 60 seconds. diff --git a/docs/reference/indices/create-index.asciidoc b/docs/reference/indices/create-index.asciidoc new file mode 100644 index 0000000..0b069d3 --- /dev/null +++ b/docs/reference/indices/create-index.asciidoc @@ -0,0 +1,106 @@ +[[indices-create-index]] +== Create Index + +The create index API allows to instantiate an index. Elasticsearch +provides support for multiple indices, including executing operations +across several indices. + +[float] +[[create-index-settings]] +=== Index Settings + +Each index created can have specific settings +associated with it. + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/' + +$ curl -XPUT 'http://localhost:9200/twitter/' -d ' +index : + number_of_shards : 3 + number_of_replicas : 2 +' +-------------------------------------------------- + +The above second curl example shows how an index called `twitter` can be +created with specific settings for it using http://www.yaml.org[YAML]. +In this case, creating an index with 3 shards, each with 2 replicas. The +index settings can also be defined with http://www.json.org[JSON]: + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/' -d '{ + "settings" : { + "index" : { + "number_of_shards" : 3, + "number_of_replicas" : 2 + } + } +}' +-------------------------------------------------- + +or more simplified + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/' -d '{ + "settings" : { + "number_of_shards" : 3, + "number_of_replicas" : 2 + } +}' +-------------------------------------------------- + +[NOTE] +You do not have to explicitly specify `index` section inside the +`settings` section. + +For more information regarding all the different index level settings +that can be set when creating an index, please check the +<<index-modules,index modules>> section. + + +[float] +[[mappings]] +=== Mappings + +The create index API allows to provide a set of one or more mappings: + +[source,js] +-------------------------------------------------- +curl -XPOST localhost:9200/test -d '{ + "settings" : { + "number_of_shards" : 1 + }, + "mappings" : { + "type1" : { + "_source" : { "enabled" : false }, + "properties" : { + "field1" : { "type" : "string", "index" : "not_analyzed" } + } + } + } +}' +-------------------------------------------------- + +[float] +[[warmers]] +=== Warmers + +The create index API allows also to provide a set of <<indices-warmers,warmers>>: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test -d '{ + "warmers" : { + "warmer_1" : { + "source" : { + "query" : { + ... + } + } + } + } +}' +-------------------------------------------------- diff --git a/docs/reference/indices/delete-index.asciidoc b/docs/reference/indices/delete-index.asciidoc new file mode 100644 index 0000000..25d1766 --- /dev/null +++ b/docs/reference/indices/delete-index.asciidoc @@ -0,0 +1,19 @@ +[[indices-delete-index]] +== Delete Index + +The delete index API allows to delete an existing index. + +[source,js] +-------------------------------------------------- +$ curl -XDELETE 'http://localhost:9200/twitter/' +-------------------------------------------------- + +The above example deletes an index called `twitter`. Specifying an index, +alias or wildcard expression is required. + +The delete index API can also be applied to more than one index, or on +all indices (be careful!) by using `_all` or `*` as index. + +In order to disable allowing to delete indices via wildcards or `_all`, +set `action.destructive_requires_name` setting in the config to `true`. +This setting can also be changed via the cluster update settings api.
\ No newline at end of file diff --git a/docs/reference/indices/delete-mapping.asciidoc b/docs/reference/indices/delete-mapping.asciidoc new file mode 100644 index 0000000..9b72d9c --- /dev/null +++ b/docs/reference/indices/delete-mapping.asciidoc @@ -0,0 +1,25 @@ +[[indices-delete-mapping]] +== Delete Mapping + +Allow to delete a mapping (type) along with its data. The REST endpoints are + +[source,js] +-------------------------------------------------- + +[DELETE] /{index}/{type} + +[DELETE] /{index}/{type}/_mapping + +[DELETE] /{index}/_mapping/{type} + +-------------------------------------------------- + +where + +[horizontal] + +`index`:: `* | _all | glob pattern | name1, name2, …` +`type`:: `* | _all | glob pattern | name1, name2, …` + +Note, most times, it make more sense to reindex the data into a fresh +index compared to delete large chunks of it. diff --git a/docs/reference/indices/flush.asciidoc b/docs/reference/indices/flush.asciidoc new file mode 100644 index 0000000..75b935a --- /dev/null +++ b/docs/reference/indices/flush.asciidoc @@ -0,0 +1,27 @@ +[[indices-flush]] +== Flush + +The flush API allows to flush one or more indices through an API. The +flush process of an index basically frees memory from the index by +flushing data to the index storage and clearing the internal +<<index-modules-translog,transaction log>>. By +default, Elasticsearch uses memory heuristics in order to automatically +trigger flush operations as required in order to clear memory. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/_flush' +-------------------------------------------------- + +[float] +=== Multi Index + +The flush API can be applied to more than one index with a single call, +or even on `_all` the indices. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/kimchy,elasticsearch/_flush' + +$ curl -XPOST 'http://localhost:9200/_flush' +-------------------------------------------------- diff --git a/docs/reference/indices/gateway-snapshot.asciidoc b/docs/reference/indices/gateway-snapshot.asciidoc new file mode 100644 index 0000000..188d1aa --- /dev/null +++ b/docs/reference/indices/gateway-snapshot.asciidoc @@ -0,0 +1,29 @@ +[[indices-gateway-snapshot]] +== Gateway Snapshot + +The gateway snapshot API allows to explicitly perform a snapshot through +the gateway of one or more indices (backup them). By default, each index +gateway periodically snapshot changes, though it can be disabled and be +controlled completely through this API. + +Note, this API only applies when using shared storage gateway +implementation, and does not apply when using the (default) local +gateway. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/_gateway/snapshot' +-------------------------------------------------- + +[float] +=== Multi Index + +The gateway snapshot API can be applied to more than one index with a +single call, or even on `_all` the indices. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/kimchy,elasticsearch/_gateway/snapshot' + +$ curl -XPOST 'http://localhost:9200/_gateway/snapshot' +-------------------------------------------------- diff --git a/docs/reference/indices/get-field-mapping.asciidoc b/docs/reference/indices/get-field-mapping.asciidoc new file mode 100644 index 0000000..0633744 --- /dev/null +++ b/docs/reference/indices/get-field-mapping.asciidoc @@ -0,0 +1,140 @@ +[[indices-get-field-mapping]] +== Get Field Mapping + +The get field mapping API allows you to retrieve mapping definitions for one or more fields. +This is useful when you do not need the complete type mapping returned by +the <<indices-get-mapping>> API. + +The following returns the mapping of the field `text` only: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/_mapping/field/text' +-------------------------------------------------- + +For which the response is (assuming `text` is a default string field): + +[source,js] +-------------------------------------------------- +{ + "twitter": { + "tweet": { + "text": { + "full_name": "text", + "mapping": { + "text": { "type": "string" } + } + } + } + } +} +-------------------------------------------------- + + + +[float] +=== Multiple Indices, Types and Fields + +The get field mapping API can be used to get the mapping of multiple fields from more than one index or type +with a single call. General usage of the API follows the +following syntax: `host:port/{index}/{type}/_mapping/field/{field}` where +`{index}`, `{type}` and `{field}` can stand for comma-separated list of names or wild cards. To +get mappings for all indices you can use `_all` for `{index}`. The +following are some examples: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter,kimchy/_mapping/field/message' + +curl -XGET 'http://localhost:9200/_all/tweet,book/_mapping/field/message,user.id' + +curl -XGET 'http://localhost:9200/_all/tw*/_mapping/field/*.id' +-------------------------------------------------- + +[float] +=== Specifying fields + +The get mapping api allows you to specify one or more fields separated with by a comma. +You can also use wildcards. The field names can be any of the following: + +[horizontal] +Full names:: the full path, including any parent object name the field is + part of (ex. `user.id`). +Index names:: the name of the lucene field (can be different than the + field name if the `index_name` option of the mapping is used). +Field names:: the name of the field without the path to it (ex. `id` for `{ "user" : { "id" : 1 } }`). + +The above options are specified in the order the `field` parameter is resolved. +The first field found which matches is returned. This is especially important +if index names or field names are used as those can be ambiguous. + +For example, consider the following mapping: + +[source,js] +-------------------------------------------------- + { + "article": { + "properties": { + "id": { "type": "string" }, + "title": { "type": "string", "index_name": "text" }, + "abstract": { "type": "string", "index_name": "text" }, + "author": { + "properties": { + "id": { "type": "string" }, + "name": { "type": "string", "index_name": "author" } + } + } + } + } + } +-------------------------------------------------- + +To select the `id` of the `author` field, you can use its full name `author.id`. Using `text` will return +the mapping of `abstract` as it is one of the fields which map to the Lucene field `text`. `name` will return +the field `author.name`: + +[source,js] +-------------------------------------------------- +curl -XGET "http://localhost:9200/publications/article/_mapping/field/author.id,text,name" +-------------------------------------------------- + +returns: + +[source,js] +-------------------------------------------------- +{ + "publications": { + "article": { + "text": { + "full_name": "abstract", + "mapping": { + "abstract": { "type": "string", "index_name": "text" } + } + }, + "author.id": { + "full_name": "author.id", + "mapping": { + "id": { "type": "string" } + } + }, + "name": { + "full_name": "author.name", + "mapping": { + "name": { "type": "string", "index_name": "author" } + } + } + } + } +} +-------------------------------------------------- + +Note how the response always use the same fields specified in the request as keys. +The `full_name` in every entry contains the full name of the field whose mapping were returned. +This is useful when the request can refer to to multiple fields (like `text` above). + +[float] +=== Other options + +[horizontal] +include_defaults:: adding `include_defaults=true` to the query string will cause the response to +include default values, which are normally suppressed. diff --git a/docs/reference/indices/get-mapping.asciidoc b/docs/reference/indices/get-mapping.asciidoc new file mode 100644 index 0000000..a64b14d --- /dev/null +++ b/docs/reference/indices/get-mapping.asciidoc @@ -0,0 +1,37 @@ +[[indices-get-mapping]] +== Get Mapping + +The get mapping API allows to retrieve mapping definition of index or +index/type. + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/_mapping' +-------------------------------------------------- + +[float] +=== Multiple Indices and Types + +The get mapping API can be used to get more than one index or type +mapping with a single call. General usage of the API follows the +following syntax: `host:port/{index}/{type}/_mapping` where both +`{index}` and `{type}` can stand for comma-separated list of names. To +get mappings for all indices you can use `_all` for `{index}`. The +following are some examples: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter,kimchy/_mapping' + +curl -XGET 'http://localhost:9200/_all/tweet,book/_mapping' +-------------------------------------------------- + +If you want to get mappings of all indices and types then the following +two examples are equivalent: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/_all/_mapping' + +curl -XGET 'http://localhost:9200/_mapping' +-------------------------------------------------- diff --git a/docs/reference/indices/get-settings.asciidoc b/docs/reference/indices/get-settings.asciidoc new file mode 100644 index 0000000..a5950c2 --- /dev/null +++ b/docs/reference/indices/get-settings.asciidoc @@ -0,0 +1,50 @@ +[[indices-get-settings]] +== Get Settings + +The get settings API allows to retrieve settings of index/indices: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/_settings' +-------------------------------------------------- + +[float] +=== Multiple Indices and Types + +The get settings API can be used to get settings for more than one index +with a single call. General usage of the API follows the +following syntax: `host:port/{index}/_settings` where +`{index}` can stand for comma-separated list of index names and aliases. To +get settings for all indices you can use `_all` for `{index}`. +Wildcard expressions are also supported. The following are some examples: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter,kimchy/_settings' + +curl -XGET 'http://localhost:9200/_all/_settings' + +curl -XGET 'http://localhost:9200/2013-*/_settings' +-------------------------------------------------- + +[float] +=== Prefix option + +There is also support for a `prefix` query string option +that allows to include only settings matches the specified prefix. + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/my-index/_settings?prefix=index.' + +curl -XGET 'http://localhost:9200/_all/_settings?prefix=index.routing.allocation.' + +curl -XGET 'http://localhost:9200/2013-*/_settings?name=index.merge.*' + +curl -XGET 'http://localhost:9200/2013-*/_settings/index.merge.*' +-------------------------------------------------- + +The first example returns all index settings the start with `index.` in the index `my-index`, +the second example gets all index settings that start with `index.routing.allocation.` for +all indices, lastly the third example returns all index settings that start with `index.merge.` +in indices that start with `2013-`. diff --git a/docs/reference/indices/indices-exists.asciidoc b/docs/reference/indices/indices-exists.asciidoc new file mode 100644 index 0000000..422dcba --- /dev/null +++ b/docs/reference/indices/indices-exists.asciidoc @@ -0,0 +1,12 @@ +[[indices-exists]] +== Indices Exists + +Used to check if the index (indices) exists or not. For example: + +[source,js] +-------------------------------------------------- +curl -XHEAD 'http://localhost:9200/twitter' +-------------------------------------------------- + +The HTTP status code indicates if the index exists or not. A `404` means +it does not exist, and `200` means it does. diff --git a/docs/reference/indices/open-close.asciidoc b/docs/reference/indices/open-close.asciidoc new file mode 100644 index 0000000..29259d2 --- /dev/null +++ b/docs/reference/indices/open-close.asciidoc @@ -0,0 +1,29 @@ +[[indices-open-close]] +== Open / Close Index API + +The open and close index APIs allow to close an index, and later on +opening it. A closed index has almost no overhead on the cluster (except +for maintaining its metadata), and is blocked for read/write operations. +A closed index can be opened which will then go through the normal +recovery process. + +The REST endpoint is `/{index}/_close` and `/{index}/_open`. For +example: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/my_index/_close' + +curl -XPOST 'localhost:9200/my_index/_open' +-------------------------------------------------- + +It is possible to open and close multiple indices. An error will be thrown +if the request explicitly refers to a missing index. This behaviour can be +disabled using the `ignore_unavailable=true` parameter. + +All indices can be opened or closed at once using `_all` as the index name +or specifying patterns that identify them all (e.g. `*`). + +Identifying indices via wildcards or `_all` can be disabled by setting the +`action.destructive_requires_name` flag in the config file to `true`. +This setting can also be changed via the cluster update settings api.
\ No newline at end of file diff --git a/docs/reference/indices/optimize.asciidoc b/docs/reference/indices/optimize.asciidoc new file mode 100644 index 0000000..d8ebc8b --- /dev/null +++ b/docs/reference/indices/optimize.asciidoc @@ -0,0 +1,51 @@ +[[indices-optimize]] +== Optimize + +The optimize API allows to optimize one or more indices through an API. +The optimize process basically optimizes the index for faster search +operations (and relates to the number of segments a Lucene index holds +within each shard). The optimize operation allows to reduce the number +of segments by merging them. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/_optimize' +-------------------------------------------------- + +[float] +[[optimize-parameters]] +=== Request Parameters + +The optimize API accepts the following request parameters: + +[horizontal] +`max_num_segments`:: The number of segments to optimize to. To fully +optimize the index, set it to `1`. Defaults to simply checking if a +merge needs to execute, and if so, executes it. + +`only_expunge_deletes`:: Should the optimize process only expunge segments +with deletes in it. In Lucene, a document is not deleted from a segment, +just marked as deleted. During a merge process of segments, a new +segment is created that does not have those deletes. This flag allow to +only merge segments that have deletes. Defaults to `false`. + +`flush`:: Should a flush be performed after the optimize. Defaults to +`true`. + +`wait_for_merge`:: Should the request wait for the merge to end. Defaults +to `true`. Note, a merge can potentially be a very heavy operation, so +it might make sense to run it set to `false`. + +[float] +[[optimize-multi-index]] +=== Multi Index + +The optimize API can be applied to more than one index with a single +call, or even on `_all` the indices. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/kimchy,elasticsearch/_optimize' + +$ curl -XPOST 'http://localhost:9200/_optimize' +-------------------------------------------------- diff --git a/docs/reference/indices/put-mapping.asciidoc b/docs/reference/indices/put-mapping.asciidoc new file mode 100644 index 0000000..7748625 --- /dev/null +++ b/docs/reference/indices/put-mapping.asciidoc @@ -0,0 +1,83 @@ +[[indices-put-mapping]] +== Put Mapping + +The put mapping API allows to register specific mapping definition for a +specific type. + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/tweet/_mapping' -d ' +{ + "tweet" : { + "properties" : { + "message" : {"type" : "string", "store" : true } + } + } +} +' +-------------------------------------------------- + +The above example creates a mapping called `tweet` within the `twitter` +index. The mapping simply defines that the `message` field should be +stored (by default, fields are not stored, just indexed) so we can +retrieve it later on using selective loading. + +More information on how to define type mappings can be found in the +<<mapping,mapping>> section. + +[float] +[[merging-conflicts]] +=== Merging & Conflicts + +When an existing mapping already exists under the given type, the two +mapping definitions, the one already defined, and the new ones are +merged. The `ignore_conflicts` parameters can be used to control if +conflicts should be ignored or not, by default, it is set to `false` +which means conflicts are *not* ignored. + +The definition of conflict is really dependent on the type merged, but +in general, if a different core type is defined, it is considered as a +conflict. New mapping definitions can be added to object types, and core +type mapping can be upgraded by specifying multi fields on a core type. + +[float] +[[put-mapping-multi-index]] +=== Multi Index + +The put mapping API can be applied to more than one index with a single +call, or even on `_all` the indices. + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/kimchy,elasticsearch/tweet/_mapping' -d ' +{ + "tweet" : { + "properties" : { + "message" : {"type" : "string", "store" : true } + } + } +} +' +-------------------------------------------------- + +All options: + +[source,js] +-------------------------------------------------- + +PUT /{index}/_mapping/{type} + + +-------------------------------------------------- + + +where + +[horizontal] +`{index}`:: `blank | * | _all | glob pattern | name1, name2, …` + +`{type}`:: Name of the type to add. Must be the name of the type defined in the body. + + +Instead of `_mapping` you can also use the plural `_mappings`. +The uri `PUT /{index}/{type}/_mapping` is still supported for backwardscompatibility. diff --git a/docs/reference/indices/refresh.asciidoc b/docs/reference/indices/refresh.asciidoc new file mode 100644 index 0000000..bbc1f20 --- /dev/null +++ b/docs/reference/indices/refresh.asciidoc @@ -0,0 +1,26 @@ +[[indices-refresh]] +== Refresh + +The refresh API allows to explicitly refresh one or more index, making +all operations performed since the last refresh available for search. +The (near) real-time capabilities depend on the index engine used. For +example, the internal one requires refresh to be called, but by default a +refresh is scheduled periodically. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/_refresh' +-------------------------------------------------- + +[float] +=== Multi Index + +The refresh API can be applied to more than one index with a single +call, or even on `_all` the indices. + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/kimchy,elasticsearch/_refresh' + +$ curl -XPOST 'http://localhost:9200/_refresh' +-------------------------------------------------- diff --git a/docs/reference/indices/segments.asciidoc b/docs/reference/indices/segments.asciidoc new file mode 100644 index 0000000..bc4a7ff --- /dev/null +++ b/docs/reference/indices/segments.asciidoc @@ -0,0 +1,76 @@ +[[indices-segments]] +== Indices Segments + +Provide low level segments information that a Lucene index (shard level) +is built with. Allows to be used to provide more information on the +state of a shard and an index, possibly optimization information, data +"wasted" on deletes, and so on. + +Endpoints include segments for a specific index, several indices, or +all: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/test/_segments' +curl -XGET 'http://localhost:9200/test1,test2/_segments' +curl -XGET 'http://localhost:9200/_segments' +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + "_3": { + "generation": 3, + "num_docs": 1121, + "deleted_docs": 53, + "size_in_bytes": 228288, + "memory_in_bytes": 3211, + "committed": true, + "search": true, + "version": "4.6", + "compound": true + } + ... +} +-------------------------------------------------- + +_0:: The key of the JSON document is the name of the segment. This name + is used to generate file names: all files starting with this + segment name in the directory of the shard belong to this segment. + +generation:: A generation number that is basically incremented when needing to + write a new segment. The segment name is derived from this + generation number. + +num_docs:: The number of non-deleted documents that are stored in this segment. + +deleted_docs:: The number of deleted documents that are stored in this segment. + It is perfectly fine if this number is greater than 0, space is + going to be reclaimed when this segment gets merged. + +size_in_bytes:: The amount of disk space that this segment uses, in bytes. + +memory_in_bytes:: Segments need to store some data into memory in order to be + searchable efficiently. This number returns the number of bytes + that are used for that purpose. A value of -1 indicates that + Elasticsearch was not able to compute this number. + +committed:: Whether the segment has been sync'ed on disk. Segments that are + committed would survive a hard reboot. No need to worry in case + of false, the data from uncommitted segments is also stored in + the transaction log so that Elasticsearch is able to replay + changes on the next start. + +search:: Whether the segment is searchable. A value of false would most + likely mean that the segment has been written to disk but no + refresh occurred since then to make it searchable. + +version:: The version of Lucene that has been used to write this segment. + +compound:: Whether the segment is stored in a compound file. When true, this + means that Lucene merged all files from the segment in a single + one in order to save file descriptors. + diff --git a/docs/reference/indices/stats.asciidoc b/docs/reference/indices/stats.asciidoc new file mode 100644 index 0000000..b0dd311 --- /dev/null +++ b/docs/reference/indices/stats.asciidoc @@ -0,0 +1,76 @@ +[[indices-stats]] +== Indices Stats + +Indices level stats provide statistics on different operations happening +on an index. The API provides statistics on the index level scope +(though most stats can also be retrieved using node level scope). + +The following returns high level aggregation and index level stats for +all indices: + +[source,js] +-------------------------------------------------- +curl localhost:9200/_stats +-------------------------------------------------- + +Specific index stats can be retrieved using: + +[source,js] +-------------------------------------------------- +curl localhost:9200/index1,index2/_stats +-------------------------------------------------- + +By default, all stats are returned, returning only specific stats can be +specified as well in the URI. Those stats can be any of: + +[horizontal] +`docs`:: The number of docs / deleted docs (docs not yet merged out). + Note, affected by refreshing the index. + +`store`:: The size of the index. + +`indexing`:: Indexing statistics, can be combined with a comma + separated list of `types` to provide document type level stats. + +`get`:: Get statistics, including missing stats. + +`search`:: Search statistics. You can include statistics for custom groups by adding + an extra `groups` parameter (search operations can be associated with one or more + groups). The `groups` parameter accepts a comma separated list of group names. + Use `_all` to return statistics for all groups. + +`warmer`:: Warmer statistics. +`merge`:: Merge statistics. +`fielddata`:: Fielddata statistics. +`flush`:: Flush statistics. +`completion`:: Completion suggest statistics. +`refresh`:: Refresh statistics. + +Some statistics allow per field granularity which accepts a list comma-separated list of included fields. By default all fields are included: + +[horizontal] +`fields`:: List of fields to be included in the statistics. This is used as the default list unless a more specific field list is provided (see below). +`completion_fields`:: List of fields to be included in the Completion Suggest statistics +`fielddata_fields`:: List of fields to be included in the Fielddata statistics + +Here are some samples: + +[source,js] +-------------------------------------------------- +# Get back stats for merge and refresh only for all indices +curl 'localhost:9200/_stats/merge,refresh' +# Get back stats for type1 and type2 documents for the my_index index +curl 'localhost:9200/my_index/_stats/indexing?types=type1,type2 +# Get back just search stats for group1 and group2 +curl 'localhost:9200/_stats/search?groups=group1,group2 +-------------------------------------------------- + +The stats returned are aggregated on the index level, with +`primaries` and `total` aggregations. In order to get back shard level +stats, set the `level` parameter to `shards`. + +Note, as shards move around the cluster, their stats will be cleared as +they are created on other nodes. On the other hand, even though a shard +"left" a node, that node will still retain the stats that shard +contributed to. + diff --git a/docs/reference/indices/status.asciidoc b/docs/reference/indices/status.asciidoc new file mode 100644 index 0000000..c454b0f --- /dev/null +++ b/docs/reference/indices/status.asciidoc @@ -0,0 +1,27 @@ +[[indices-status]] +== Status + +The indices status API allows to get a comprehensive status information +of one or more indices. + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/_status' +-------------------------------------------------- + +In order to see the recovery status of shards, pass `recovery` flag and +set it to `true`. For snapshot status, pass the `snapshot` flag and set +it to `true`. + +[float] +=== Multi Index + +The status API can be applied to more than one index with a single call, +or even on `_all` the indices. + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/kimchy,elasticsearch/_status' + +curl -XGET 'http://localhost:9200/_status' +-------------------------------------------------- diff --git a/docs/reference/indices/templates.asciidoc b/docs/reference/indices/templates.asciidoc new file mode 100644 index 0000000..ce1c33c --- /dev/null +++ b/docs/reference/indices/templates.asciidoc @@ -0,0 +1,155 @@ +[[indices-templates]] +== Index Templates + +Index templates allow to define templates that will automatically be +applied to new indices created. The templates include both settings and +mappings, and a simple pattern template that controls if the template +will be applied to the index created. For example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_template/template_1 -d ' +{ + "template" : "te*", + "settings" : { + "number_of_shards" : 1 + }, + "mappings" : { + "type1" : { + "_source" : { "enabled" : false } + } + } +} +' +-------------------------------------------------- + +Defines a template named template_1, with a template pattern of `te*`. +The settings and mappings will be applied to any index name that matches +the `te*` template. + +[float] +[[delete]] +=== Deleting a Template + +Index templates are identified by a name (in the above case +`template_1`) and can be delete as well: + +[source,js] +-------------------------------------------------- +curl -XDELETE localhost:9200/_template/template_1 +-------------------------------------------------- + +[float] +[[getting]] +=== GETting templates + +Index templates are identified by a name (in the above case +`template_1`) and can be retrieved using the following: + +[source,js] +-------------------------------------------------- +curl -XGET localhost:9200/_template/template_1 +-------------------------------------------------- + +You can also match several templates by using wildcards like: + +[source,js] +-------------------------------------------------- +curl -XGET localhost:9200/_template/temp* +curl -XGET localhost:9200/_template/template_1,template_2 +-------------------------------------------------- + +To get list of all index templates you can use +<<cluster-state,Cluster State>> API +and check for the metadata/templates section of the response. + +Or run: + +[source,js] +-------------------------------------------------- +curl -XGET localhost:9200/_template/ +-------------------------------------------------- + + +[float] +[[multiple-templates]] +=== Multiple Template Matching + +Multiple index templates can potentially match an index, in this case, +both the settings and mappings are merged into the final configuration +of the index. The order of the merging can be controlled using the +`order` parameter, with lower order being applied first, and higher +orders overriding them. For example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_template/template_1 -d ' +{ + "template" : "*", + "order" : 0, + "settings" : { + "number_of_shards" : 1 + }, + "mappings" : { + "type1" : { + "_source" : { "enabled" : false } + } + } +} +' + +curl -XPUT localhost:9200/_template/template_2 -d ' +{ + "template" : "te*", + "order" : 1, + "settings" : { + "number_of_shards" : 1 + }, + "mappings" : { + "type1" : { + "_source" : { "enabled" : true } + } + } +} +' +-------------------------------------------------- + +The above will disable storing the `_source` on all `type1` types, but +for indices of that start with `te*`, source will still be enabled. +Note, for mappings, the merging is "deep", meaning that specific +object/property based mappings can easily be added/overridden on higher +order templates, with lower order templates providing the basis. + +[float] +[[config]] +=== Config + +Index templates can also be placed within the config location +(`path.conf`) under the `templates` directory (note, make sure to place +them on all master eligible nodes). For example, a file called +`template_1.json` can be placed under `config/templates` and it will be +added if it matches an index. Here is a sample of the mentioned file: + +[source,js] +-------------------------------------------------- +{ + "template_1" : { + "template" : "*", + "settings" : { + "index.number_of_shards" : 2 + }, + "mappings" : { + "_default_" : { + "_source" : { + "enabled" : false + } + }, + "type1" : { + "_all" : { + "enabled" : false + } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/indices/types-exists.asciidoc b/docs/reference/indices/types-exists.asciidoc new file mode 100644 index 0000000..87b0aa3 --- /dev/null +++ b/docs/reference/indices/types-exists.asciidoc @@ -0,0 +1,12 @@ +[[indices-types-exists]] +== Types Exists + +Used to check if a type/types exists in an index/indices. + +[source,js] +-------------------------------------------------- +curl -XHEAD 'http://localhost:9200/twitter/tweet' +-------------------------------------------------- + +The HTTP status code indicates if the type exists or not. A `404` means +it does not exist, and `200` means it does. diff --git a/docs/reference/indices/update-settings.asciidoc b/docs/reference/indices/update-settings.asciidoc new file mode 100644 index 0000000..19af576 --- /dev/null +++ b/docs/reference/indices/update-settings.asciidoc @@ -0,0 +1,226 @@ +[[indices-update-settings]] +== Update Indices Settings + +Change specific index level settings in real time. + +The REST endpoint is `/_settings` (to update all indices) or +`{index}/_settings` to update one (or more) indices settings. The body +of the request includes the updated settings, for example: + +[source,js] +-------------------------------------------------- +{ + "index" : { + "number_of_replicas" : 4 + } } +-------------------------------------------------- + +The above will change the number of replicas to 4 from the current +number of replicas. Here is a curl example: + +[source,js] +-------------------------------------------------- +curl -XPUT 'localhost:9200/my_index/_settings' -d ' +{ + "index" : { + "number_of_replicas" : 4 + } } +' +-------------------------------------------------- + +Below is the list of settings that can be changed using the update +settings API: + +`index.number_of_replicas`:: + The number of replicas each shard has. + +`index.auto_expand_replicas`:: + Set to an actual value (like `0-all`) or `false` to disable it. + +`index.blocks.read_only`:: + Set to `true` to have the index read only, `false` to allow writes + and metadata changes. + +`index.blocks.read`:: + Set to `true` to disable read operations againstthe index. + +`index.blocks.write`:: + Set to `true` to disable write operations against the index. + +`index.blocks.metadata`:: + Set to `true` to disable metadata operations against the index. + +`index.refresh_interval`:: + The async refresh interval of a shard. + +`index.index_concurrency`:: + Defaults to `8`. + +`index.codec`:: + Codec. Default to `default`. + +`index.codec.bloom.load`:: + Whether to load the bloom filter. Defaults to `true`. + See <<bloom-postings>>. + +`index.fail_on_merge_failure`:: + Default to `true`. + +`index.translog.flush_threshold_ops`:: + When to flush based on operations. + +`index.translog.flush_threshold_size`:: + When to flush based on translog (bytes) size. + +`index.translog.flush_threshold_period`:: + When to flush based on a period of not flushing. + +`index.translog.disable_flush`:: + Disables flushing. Note, should be set for a short + interval and then enabled. + +`index.cache.filter.max_size`:: + The maximum size of filter cache (per segment in shard). + Set to `-1` to disable. + +`index.cache.filter.expire`:: + The expire after access time for filter cache. + Set to `-1` to disable. + +`index.gateway.snapshot_interval`:: + The gateway snapshot interval (only applies to shared gateways). + Defaults to 10s. + +<<index-modules-merge,merge policy>>:: + All the settings for the merge policy currently configured. + A different merge policy can't be set. + +`index.routing.allocation.include.*`:: + A node matching any rule will be allowed to host shards from the index. + +`index.routing.allocation.exclude.*`:: + A node matching any rule will NOT be allowed to host shards from the index. + +`index.routing.allocation.require.*`:: + Only nodes matching all rules will be allowed to host shards from the index. + +`index.routing.allocation.disable_allocation`:: + Disable allocation. Defaults to `false`. Deprecated in favour for `index.routing.allocation.enable`. + +`index.routing.allocation.disable_new_allocation`:: + Disable new allocation. Defaults to `false`. Deprecated in favour for `index.routing.allocation.enable`. + +`index.routing.allocation.disable_replica_allocation`:: + Disable replica allocation. Defaults to `false`. Deprecated in favour for `index.routing.allocation.enable`. + +added[1.0.0.RC1] + +`index.routing.allocation.enable`:: + Enables shard allocation for a specific index. It can be set to: + * `all` (default) - Allows shard allocation for all shards. + * `primaries` - Allows shard allocation only for primary shards. + * `new_primaries` - Allows shard allocation only for primary shards for new indices. + * `none` - No shard allocation is allowed. + +`index.routing.allocation.total_shards_per_node`:: + Controls the total number of shards allowed to be allocated on a single node. Defaults to unbounded (`-1`). + +`index.recovery.initial_shards`:: + When using local gateway a particular shard is recovered only if there can be allocated quorum shards in the cluster. It can be set to: + * `quorum` (default) + * `quorum-1` (or `half`) + * `full` + * `full-1`. + * Number values are also supported, e.g. `1`. + +`index.gc_deletes`:: + +`index.ttl.disable_purge`:: + Disables temporarily the purge of expired docs. + +<<index-modules-store,store level throttling>>:: + All the settings for the store level throttling policy currently configured. + +`index.translog.fs.type`:: + Either `simple` or `buffered` (default). + +`index.compound_format`:: + See <<index-compound-format,`index.compound_format`>> in + <<index-modules-settings>>. + +`index.compound_on_flush`:: + See <<index-compound-on-flush,`index.compound_on_flush>> in + <<index-modules-settings>>. + +<<index-modules-slowlog>>:: + All the settings for slow log. + +`index.warmer.enabled`:: + See <<indices-warmers>>. Defaults to `true`. + +[float] +[[bulk]] +=== Bulk Indexing Usage + +For example, the update settings API can be used to dynamically change +the index from being more performant for bulk indexing, and then move it +to more real time indexing state. Before the bulk indexing is started, +use: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index" : { + "refresh_interval" : "-1" + } }' +-------------------------------------------------- + +(Another optimization option is to start the index without any replicas, +and only later adding them, but that really depends on the use case). + +Then, once bulk indexing is done, the settings can be updated (back to +the defaults for example): + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index" : { + "refresh_interval" : "1s" + } }' +-------------------------------------------------- + +And, an optimize should be called: + +[source,js] +-------------------------------------------------- +curl -XPOST 'http://localhost:9200/test/_optimize?max_num_segments=5' +-------------------------------------------------- + +[float] +[[update-settings-analysis]] +=== Updating Index Analysis + +It is also possible to define new <<analysis,analyzers>> for the index. +But it is required to <<indices-open-close,close>> the index +first and <<indices-open-close,open>> it after the changes are made. + +For example if `content` analyzer hasn't been defined on `myindex` yet +you can use the following commands to add it: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/myindex/_close' + +curl -XPUT 'localhost:9200/myindex/_settings' -d '{ + "analysis" : { + "analyzer":{ + "content":{ + "type":"custom", + "tokenizer":"whitespace" + } + } + } +}' + +curl -XPOST 'localhost:9200/myindex/_open' +-------------------------------------------------- diff --git a/docs/reference/indices/warmers.asciidoc b/docs/reference/indices/warmers.asciidoc new file mode 100644 index 0000000..bc71094 --- /dev/null +++ b/docs/reference/indices/warmers.asciidoc @@ -0,0 +1,183 @@ +[[indices-warmers]] +== Warmers + +Index warming allows to run registered search requests to warm up the +index before it is available for search. With the near real time aspect +of search, cold data (segments) will be warmed up before they become +available for search. + +Warmup searches typically include requests that require heavy loading of +data, such as faceting or sorting on specific fields. The warmup APIs +allows to register warmup (search) under specific names, remove them, +and get them. + +Index warmup can be disabled by setting `index.warmer.enabled` to +`false`. It is supported as a realtime setting using update settings +API. This can be handy when doing initial bulk indexing, disabling pre +registered warmers to make indexing faster and less expensive and then +enable it. + +[float] +[[creation]] +=== Index Creation / Templates + +Warmers can be registered when an index gets created, for example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test -d '{ + "warmers" : { + "warmer_1" : { + "types" : [], + "source" : { + "query" : { + ... + }, + "facets" : { + ... + } + } + } + } +}' +-------------------------------------------------- + +Or, in an index template: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_template/template_1 -d ' +{ + "template" : "te*", + "warmers" : { + "warmer_1" : { + "types" : [], + "source" : { + "query" : { + ... + }, + "facets" : { + ... + } + } + } + } +}' +-------------------------------------------------- + +[float] +[[warmer-adding]] +=== Put Warmer + +Allows to put a warmup search request on a specific index (or indices), +with the body composing of a regular search request. Types can be +provided as part of the URI if the search request is designed to be run +only against the specific types. + +Here is an example that registers a warmup called `warmer_1` against +index `test` (can be alias or several indices), for a search request +that runs against all types: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_warmer/warmer_1 -d '{ + "query" : { + "match_all" : {} + }, + "facets" : { + "facet_1" : { + "terms" : { + "field" : "field" + } + } + } +}' +-------------------------------------------------- + +And an example that registers a warmup against specific types: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/type1/_warmer/warmer_1 -d '{ + "query" : { + "match_all" : {} + }, + "facets" : { + "facet_1" : { + "terms" : { + "field" : "field" + } + } + } +}' +-------------------------------------------------- + +All options: + +[source,js] +-------------------------------------------------- + +PUT _warmer/{warmer_name} + +PUT /{index}/_warmer/{warmer_name} + +PUT /{index}/{type}/_warmer/{warmer_name} + +-------------------------------------------------- + + +where + +[horizontal] +`{index}`:: `* | _all | glob pattern | name1, name2, …` + +`{type}`:: `* | _all | glob pattern | name1, name2, …` + +Instead of `_warmer` you can also use the plural `_warmers`. + + + +[float] +[[removing]] +=== Delete Warmers + +Warmers can be deleted using the following endpoint: + + + +[source,js] +-------------------------------------------------- + +[DELETE] /{index}/_warmer/{name} + +-------------------------------------------------- + + +where + +[horizontal] +`{index}`:: `* | _all | glob pattern | name1, name2, …` + +`{name}`:: `* | _all | glob pattern | name1, name2, …` + +Instead of `_warmer` you can also use the plural `_warmers`. + +[float] +[[warmer-retrieving]] +=== GETting Warmer + +Getting a warmer for specific index (or alias, or several indices) based +on its name. The provided name can be a simple wildcard expression or +omitted to get all warmers. Some examples: + +[source,js] +-------------------------------------------------- +# get warmer named warmer_1 on test index +curl -XGET localhost:9200/test/_warmer/warmer_1 + +# get all warmers that start with warm on test index +curl -XGET localhost:9200/test/_warmer/warm* + +# get all warmers for test index +curl -XGET localhost:9200/test/_warmer/ +-------------------------------------------------- diff --git a/docs/reference/mapping.asciidoc b/docs/reference/mapping.asciidoc new file mode 100644 index 0000000..3c5a225 --- /dev/null +++ b/docs/reference/mapping.asciidoc @@ -0,0 +1,77 @@ +[[mapping]] += Mapping + +[partintro] +-- +Mapping is the process of defining how a document should be mapped to +the Search Engine, including its searchable characteristics such as +which fields are searchable and if/how they are tokenized. In +Elasticsearch, an index may store documents of different "mapping +types". Elasticsearch allows one to associate multiple mapping +definitions for each mapping type. + +Explicit mapping is defined on an index/type level. By default, there +isn't a need to define an explicit mapping, since one is automatically +created and registered when a new type or new field is introduced (with +no performance overhead) and have sensible defaults. Only when the +defaults need to be overridden must a mapping definition be provided. + +[float] +[[all-mapping-types]] +=== Mapping Types + +Mapping types are a way to divide the documents in an index into logical +groups. Think of it as tables in a database. Though there is separation +between types, it's not a full separation (all end up as a document +within the same Lucene index). + +Field names with the same name across types are highly recommended to +have the same type and same mapping characteristics (analysis settings +for example). There is an effort to allow to explicitly "choose" which +field to use by using type prefix (`my_type.my_field`), but it's not +complete, and there are places where it will never work (like faceting +on the field). + +In practice though, this restriction is almost never an issue. The field +name usually ends up being a good indication to its "typeness" (e.g. +"first_name" will always be a string). Note also, that this does not +apply to the cross index case. + +[float] +[[mapping-api]] +=== Mapping API + +To create a mapping, you will need the <<indices-put-mapping,Put Mapping +API>>, or you can add multiple mappings when you <<indices-create-index,create an +index>>. + +[float] +[[mapping-settings]] +=== Global Settings + +The `index.mapping.ignore_malformed` global setting can be set on the +index level to allow to ignore malformed content globally across all +mapping types (malformed content example is trying to index a text string +value as a numeric type). + +The `index.mapping.coerce` global setting can be set on the +index level to coerce numeric content globally across all +mapping types (The default setting is true and coercions attempted are +to convert strings with numbers into numeric types and also numeric values +with fractions to any integer/short/long values minus the fraction part). +When the permitted conversions fail in their attempts, the value is considered +malformed and the ignore_malformed setting dictates what will happen next. +-- + +include::mapping/fields.asciidoc[] + +include::mapping/types.asciidoc[] + +include::mapping/date-format.asciidoc[] + +include::mapping/dynamic-mapping.asciidoc[] + +include::mapping/conf-mappings.asciidoc[] + +include::mapping/meta.asciidoc[] + diff --git a/docs/reference/mapping/conf-mappings.asciidoc b/docs/reference/mapping/conf-mappings.asciidoc new file mode 100644 index 0000000..e9bb3f9 --- /dev/null +++ b/docs/reference/mapping/conf-mappings.asciidoc @@ -0,0 +1,19 @@ +[[mapping-conf-mappings]] +== Config Mappings + +Creating new mappings can be done using the +<<indices-put-mapping,Put Mapping>> +API. When a document is indexed with no mapping associated with it in +the specific index, the +<<mapping-dynamic-mapping,dynamic / default +mapping>> feature will kick in and automatically create mapping +definition for it. + +Mappings can also be provided on the node level, meaning that each index +created will automatically be started with all the mappings defined +within a certain location. + +Mappings can be defined within files called `[mapping_name].json` and be +placed either under `config/mappings/_default` location, or under +`config/mappings/[index_name]` (for mappings that should be associated +only with a specific index). diff --git a/docs/reference/mapping/date-format.asciidoc b/docs/reference/mapping/date-format.asciidoc new file mode 100644 index 0000000..eada734 --- /dev/null +++ b/docs/reference/mapping/date-format.asciidoc @@ -0,0 +1,206 @@ +[[mapping-date-format]] +== Date Format + +In JSON documents, dates are represented as strings. Elasticsearch uses a set +of pre-configured format to recognize and convert those, but you can change the +defaults by specifying the `format` option when defining a `date` type, or by +specifying `dynamic_date_formats` in the `root object` mapping (which will +be used unless explicitly overridden by a `date` type). There are built in +formats supported, as well as complete custom one. + +The parsing of dates uses http://joda-time.sourceforge.net/[Joda]. The +default date parsing used if no format is specified is +http://joda-time.sourceforge.net/api-release/org/joda/time/format/ISODateTimeFormat.html#dateOptionalTimeParser()[ISODateTimeFormat.dateOptionalTimeParser]. + +An extension to the format allow to define several formats using `||` +separator. This allows to define less strict formats that can be used, +for example, the `yyyy/MM/dd HH:mm:ss||yyyy/MM/dd` format will parse +both `yyyy/MM/dd HH:mm:ss` and `yyyy/MM/dd`. The first format will also +act as the one that converts back from milliseconds to a string +representation. + +[float] +[[date-math]] +=== Date Math + +The `date` type supports using date math expression when using it in a +query/filter (mainly make sense in `range` query/filter). + +The expression starts with an "anchor" date, which can be either `now` +or a date string (in the applicable format) ending with `||`. It can +then follow by a math expression, supporting `+`, `-` and `/` +(rounding). The units supported are `y` (year), `M` (month), `w` (week), `h` (hour), +`m` (minute), and `s` (second). + +Here are some samples: `now+1h`, `now+1h+1m`, `now+1h/d`, +`2012-01-01||+1M/d`. + +Note, when doing `range` type searches, and the upper value is +inclusive, the rounding will properly be rounded to the ceiling instead +of flooring it. + +To change this behavior, set +`"mapping.date.round_ceil": false`. + + +[float] +[[built-in]] +=== Built In Formats + +The following tables lists all the defaults ISO formats supported: + +[cols="<,<",options="header",] +|======================================================================= +|Name |Description +|`basic_date`|A basic formatter for a full date as four digit year, two +digit month of year, and two digit day of month (yyyyMMdd). + +|`basic_date_time`|A basic formatter that combines a basic date and time, +separated by a 'T' (yyyyMMdd'T'HHmmss.SSSZ). + +|`basic_date_time_no_millis`|A basic formatter that combines a basic date +and time without millis, separated by a 'T' (yyyyMMdd'T'HHmmssZ). + +|`basic_ordinal_date`|A formatter for a full ordinal date, using a four +digit year and three digit dayOfYear (yyyyDDD). + +|`basic_ordinal_date_time`|A formatter for a full ordinal date and time, +using a four digit year and three digit dayOfYear +(yyyyDDD'T'HHmmss.SSSZ). + +|`basic_ordinal_date_time_no_millis`|A formatter for a full ordinal date +and time without millis, using a four digit year and three digit +dayOfYear (yyyyDDD'T'HHmmssZ). + +|`basic_time`|A basic formatter for a two digit hour of day, two digit +minute of hour, two digit second of minute, three digit millis, and time +zone offset (HHmmss.SSSZ). + +|`basic_time_no_millis`|A basic formatter for a two digit hour of day, +two digit minute of hour, two digit second of minute, and time zone +offset (HHmmssZ). + +|`basic_t_time`|A basic formatter for a two digit hour of day, two digit +minute of hour, two digit second of minute, three digit millis, and time +zone off set prefixed by 'T' ('T'HHmmss.SSSZ). + +|`basic_t_time_no_millis`|A basic formatter for a two digit hour of day, +two digit minute of hour, two digit second of minute, and time zone +offset prefixed by 'T' ('T'HHmmssZ). + +|`basic_week_date`|A basic formatter for a full date as four digit +weekyear, two digit week of weekyear, and one digit day of week +(xxxx'W'wwe). + +|`basic_week_date_time`|A basic formatter that combines a basic weekyear +date and time, separated by a 'T' (xxxx'W'wwe'T'HHmmss.SSSZ). + +|`basic_week_date_time_no_millis`|A basic formatter that combines a basic +weekyear date and time without millis, separated by a 'T' +(xxxx'W'wwe'T'HHmmssZ). + +|`date`|A formatter for a full date as four digit year, two digit month +of year, and two digit day of month (yyyy-MM-dd). + +|`date_hour`|A formatter that combines a full date and two digit hour of +day. + +|`date_hour_minute`|A formatter that combines a full date, two digit hour +of day, and two digit minute of hour. + +|`date_hour_minute_second`|A formatter that combines a full date, two +digit hour of day, two digit minute of hour, and two digit second of +minute. + +|`date_hour_minute_second_fraction`|A formatter that combines a full +date, two digit hour of day, two digit minute of hour, two digit second +of minute, and three digit fraction of second +(yyyy-MM-dd'T'HH:mm:ss.SSS). + +|`date_hour_minute_second_millis`|A formatter that combines a full date, +two digit hour of day, two digit minute of hour, two digit second of +minute, and three digit fraction of second (yyyy-MM-dd'T'HH:mm:ss.SSS). + +|`date_optional_time`|a generic ISO datetime parser where the date is +mandatory and the time is optional. + +|`date_time`|A formatter that combines a full date and time, separated by +a 'T' (yyyy-MM-dd'T'HH:mm:ss.SSSZZ). + +|`date_time_no_millis`|A formatter that combines a full date and time +without millis, separated by a 'T' (yyyy-MM-dd'T'HH:mm:ssZZ). + +|`hour`|A formatter for a two digit hour of day. + +|`hour_minute`|A formatter for a two digit hour of day and two digit +minute of hour. + +|`hour_minute_second`|A formatter for a two digit hour of day, two digit +minute of hour, and two digit second of minute. + +|`hour_minute_second_fraction`|A formatter for a two digit hour of day, +two digit minute of hour, two digit second of minute, and three digit +fraction of second (HH:mm:ss.SSS). + +|`hour_minute_second_millis`|A formatter for a two digit hour of day, two +digit minute of hour, two digit second of minute, and three digit +fraction of second (HH:mm:ss.SSS). + +|`ordinal_date`|A formatter for a full ordinal date, using a four digit +year and three digit dayOfYear (yyyy-DDD). + +|`ordinal_date_time`|A formatter for a full ordinal date and time, using +a four digit year and three digit dayOfYear (yyyy-DDD'T'HH:mm:ss.SSSZZ). + +|`ordinal_date_time_no_millis`|A formatter for a full ordinal date and +time without millis, using a four digit year and three digit dayOfYear +(yyyy-DDD'T'HH:mm:ssZZ). + +|`time`|A formatter for a two digit hour of day, two digit minute of +hour, two digit second of minute, three digit fraction of second, and +time zone offset (HH:mm:ss.SSSZZ). + +|`time_no_millis`|A formatter for a two digit hour of day, two digit +minute of hour, two digit second of minute, and time zone offset +(HH:mm:ssZZ). + +|`t_time`|A formatter for a two digit hour of day, two digit minute of +hour, two digit second of minute, three digit fraction of second, and +time zone offset prefixed by 'T' ('T'HH:mm:ss.SSSZZ). + +|`t_time_no_millis`|A formatter for a two digit hour of day, two digit +minute of hour, two digit second of minute, and time zone offset +prefixed by 'T' ('T'HH:mm:ssZZ). + +|`week_date`|A formatter for a full date as four digit weekyear, two +digit week of weekyear, and one digit day of week (xxxx-'W'ww-e). + +|`week_date_time`|A formatter that combines a full weekyear date and +time, separated by a 'T' (xxxx-'W'ww-e'T'HH:mm:ss.SSSZZ). + +|`weekDateTimeNoMillis`|A formatter that combines a full weekyear date +and time without millis, separated by a 'T' (xxxx-'W'ww-e'T'HH:mm:ssZZ). + +|`week_year`|A formatter for a four digit weekyear. + +|`weekyearWeek`|A formatter for a four digit weekyear and two digit week +of weekyear. + +|`weekyearWeekDay`|A formatter for a four digit weekyear, two digit week +of weekyear, and one digit day of week. + +|`year`|A formatter for a four digit year. + +|`year_month`|A formatter for a four digit year and two digit month of +year. + +|`year_month_day`|A formatter for a four digit year, two digit month of +year, and two digit day of month. +|======================================================================= + +[float] +[[custom]] +=== Custom Format + +Allows for a completely customizable date format explained +http://joda-time.sourceforge.net/api-release/org/joda/time/format/DateTimeFormat.html[here]. diff --git a/docs/reference/mapping/dynamic-mapping.asciidoc b/docs/reference/mapping/dynamic-mapping.asciidoc new file mode 100644 index 0000000..b10bced --- /dev/null +++ b/docs/reference/mapping/dynamic-mapping.asciidoc @@ -0,0 +1,65 @@ +[[mapping-dynamic-mapping]] +== Dynamic Mapping + +Default mappings allow to automatically apply generic mapping definition +to types that do not have mapping pre defined. This is mainly done +thanks to the fact that the +<<mapping-object-type,object mapping>> and +namely the <<mapping-root-object-type,root +object mapping>> allow for schema-less dynamic addition of unmapped +fields. + +The default mapping definition is plain mapping definition that is +embedded within the distribution: + +[source,js] +-------------------------------------------------- +{ + "_default_" : { + } +} +-------------------------------------------------- + +Pretty short, no? Basically, everything is defaulted, especially the +dynamic nature of the root object mapping. The default mapping +definition can be overridden in several manners. The simplest manner is +to simply define a file called `default-mapping.json` and placed it +under the `config` directory (which can be configured to exist in a +different location). It can also be explicitly set using the +`index.mapper.default_mapping_location` setting. + +The dynamic creation of mappings for unmapped types can be completely +disabled by setting `index.mapper.dynamic` to `false`. + +The dynamic creation of fields within a type can be completely +disabled by setting the `dynamic` property of the type to `strict`. + +Here is a <<indices-put-mapping,Put Mapping>> example that +disables dynamic field creation for a `tweet`: + +[source,js] +-------------------------------------------------- +$ curl -XPUT 'http://localhost:9200/twitter/tweet/_mapping' -d ' +{ + "tweet" : { + "dynamic": "strict", + "properties" : { + "message" : {"type" : "string", "store" : true } + } + } +} +' +-------------------------------------------------- + +Here is how we can change the default +<<mapping-date-format,date_formats>> used in the +root and inner object types: + +[source,js] +-------------------------------------------------- +{ + "_default_" : { + "date_formats" : ["yyyy-MM-dd", "dd-MM-yyyy", "date_optional_time"] + } +} +-------------------------------------------------- diff --git a/docs/reference/mapping/fields.asciidoc b/docs/reference/mapping/fields.asciidoc new file mode 100644 index 0000000..a1f7e98 --- /dev/null +++ b/docs/reference/mapping/fields.asciidoc @@ -0,0 +1,33 @@ +[[mapping-fields]] +== Fields + +Each mapping has a number of fields associated with it +which can be used to control how the document metadata +(eg <<mapping-all-field>>) is indexed. + +include::fields/uid-field.asciidoc[] + +include::fields/id-field.asciidoc[] + +include::fields/type-field.asciidoc[] + +include::fields/source-field.asciidoc[] + +include::fields/all-field.asciidoc[] + +include::fields/analyzer-field.asciidoc[] + +include::fields/boost-field.asciidoc[] + +include::fields/parent-field.asciidoc[] + +include::fields/routing-field.asciidoc[] + +include::fields/index-field.asciidoc[] + +include::fields/size-field.asciidoc[] + +include::fields/timestamp-field.asciidoc[] + +include::fields/ttl-field.asciidoc[] + diff --git a/docs/reference/mapping/fields/all-field.asciidoc b/docs/reference/mapping/fields/all-field.asciidoc new file mode 100644 index 0000000..65453ef --- /dev/null +++ b/docs/reference/mapping/fields/all-field.asciidoc @@ -0,0 +1,78 @@ +[[mapping-all-field]] +=== `_all` + +The idea of the `_all` field is that it includes the text of one or more +other fields within the document indexed. It can come very handy +especially for search requests, where we want to execute a search query +against the content of a document, without knowing which fields to +search on. This comes at the expense of CPU cycles and index size. + +The `_all` fields can be completely disabled. Explicit field mapping and +object mapping can be excluded / included in the `_all` field. By +default, it is enabled and all fields are included in it for ease of +use. + +When disabling the `_all` field, it is a good practice to set +`index.query.default_field` to a different value (for example, if you +have a main "message" field in your data, set it to `message`). + +One of the nice features of the `_all` field is that it takes into +account specific fields boost levels. Meaning that if a title field is +boosted more than content, the title (part) in the `_all` field will +mean more than the content (part) in the `_all` field. + +Here is a sample mapping: + +[source,js] +-------------------------------------------------- +{ + "person" : { + "_all" : {"enabled" : true}, + "properties" : { + "name" : { + "type" : "object", + "dynamic" : false, + "properties" : { + "first" : {"type" : "string", "store" : true , "include_in_all" : false}, + "last" : {"type" : "string", "index" : "not_analyzed"} + } + }, + "address" : { + "type" : "object", + "include_in_all" : false, + "properties" : { + "first" : { + "properties" : { + "location" : {"type" : "string", "store" : true, "index_name" : "firstLocation"} + } + }, + "last" : { + "properties" : { + "location" : {"type" : "string"} + } + } + } + }, + "simple1" : {"type" : "long", "include_in_all" : true}, + "simple2" : {"type" : "long", "include_in_all" : false} + } + } +} +-------------------------------------------------- + +The `_all` fields allows for `store`, `term_vector` and `analyzer` (with +specific `index_analyzer` and `search_analyzer`) to be set. + +[float] +[[highlighting]] +==== Highlighting + +For any field to allow +<<search-request-highlighting,highlighting>> it has +to be either stored or part of the `_source` field. By default `_all` +field does not qualify for either, so highlighting for it does not yield +any data. + +Although it is possible to `store` the `_all` field, it is basically an +aggregation of all fields, which means more data will be stored, and +highlighting it might produce strange results. diff --git a/docs/reference/mapping/fields/analyzer-field.asciidoc b/docs/reference/mapping/fields/analyzer-field.asciidoc new file mode 100644 index 0000000..30bb072 --- /dev/null +++ b/docs/reference/mapping/fields/analyzer-field.asciidoc @@ -0,0 +1,41 @@ +[[mapping-analyzer-field]] +=== `_analyzer` + +The `_analyzer` mapping allows to use a document field property as the +name of the analyzer that will be used to index the document. The +analyzer will be used for any field that does not explicitly defines an +`analyzer` or `index_analyzer` when indexing. + +Here is a simple mapping: + +[source,js] +-------------------------------------------------- +{ + "type1" : { + "_analyzer" : { + "path" : "my_field" + } + } +} +-------------------------------------------------- + +The above will use the value of the `my_field` to lookup an analyzer +registered under it. For example, indexing a the following doc: + +[source,js] +-------------------------------------------------- +{ + "my_field" : "whitespace" +} +-------------------------------------------------- + +Will cause the `whitespace` analyzer to be used as the index analyzer +for all fields without explicit analyzer setting. + +The default path value is `_analyzer`, so the analyzer can be driven for +a specific document by setting `_analyzer` field in it. If custom json +field name is needed, an explicit mapping with a different path should +be set. + +By default, the `_analyzer` field is indexed, it can be disabled by +settings `index` to `no` in the mapping. diff --git a/docs/reference/mapping/fields/boost-field.asciidoc b/docs/reference/mapping/fields/boost-field.asciidoc new file mode 100644 index 0000000..1d00845 --- /dev/null +++ b/docs/reference/mapping/fields/boost-field.asciidoc @@ -0,0 +1,72 @@ +[[mapping-boost-field]] +=== `_boost` + +deprecated[1.0.0.RC1,See <<function-score-instead-of-boost>>] + +Boosting is the process of enhancing the relevancy of a document or +field. Field level mapping allows to define explicit boost level on a +specific field. The boost field mapping (applied on the +<<mapping-root-object-type,root object>>) allows +to define a boost field mapping where *its content will control the +boost level of the document*. For example, consider the following +mapping: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_boost" : {"name" : "my_boost", "null_value" : 1.0} + } +} +-------------------------------------------------- + +The above mapping defines mapping for a field named `my_boost`. If the +`my_boost` field exists within the JSON document indexed, its value will +control the boost level of the document indexed. For example, the +following JSON document will be indexed with a boost value of `2.2`: + +[source,js] +-------------------------------------------------- +{ + "my_boost" : 2.2, + "message" : "This is a tweet!" +} +-------------------------------------------------- + +[[function-score-instead-of-boost]] +==== Function score instead of boost + +Support for document boosting via the `_boost` field has been removed +from Lucene and is deprecated in Elasticsearch as of v1.0.0.RC1. The +implementation in Lucene resulted in unpredictable result when +used with multiple fields or multi-value fields. + +Instead, the <<query-dsl-function-score-query>> can be used to achieve +the desired functionality by boosting each document by the value in +any field the document: + +[source,js] +-------------------------------------------------- +{ + "query": { + "function_score": { + "query": { <1> + "match": { + "title": "your main query" + } + }, + "functions": [{ + "script_score": { <2> + "script": "doc['my_boost_field'].value" + } + }], + "score_mode": "multiply" + } + } +} +-------------------------------------------------- +<1> The original query, now wrapped in a `function_score` query. +<2> This script returns the value in `my_boost_field`, which is then + multiplied by the query `_score` for each document. + + diff --git a/docs/reference/mapping/fields/id-field.asciidoc b/docs/reference/mapping/fields/id-field.asciidoc new file mode 100644 index 0000000..1adab49 --- /dev/null +++ b/docs/reference/mapping/fields/id-field.asciidoc @@ -0,0 +1,52 @@ +[[mapping-id-field]] +=== `_id` + +Each document indexed is associated with an id and a type. The `_id` +field can be used to index just the id, and possible also store it. By +default it is not indexed and not stored (thus, not created). + +Note, even though the `_id` is not indexed, all the APIs still work +(since they work with the `_uid` field), as well as fetching by ids +using `term`, `terms` or `prefix` queries/filters (including the +specific `ids` query/filter). + +The `_id` field can be enabled to be indexed, and possibly stored, +using: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_id" : {"index": "not_analyzed", "store" : false } + } +} +-------------------------------------------------- + +The `_id` mapping can also be associated with a `path` that will be used +to extract the id from a different location in the source document. For +example, having the following mapping: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_id" : { + "path" : "post_id" + } + } +} +-------------------------------------------------- + +Will cause `1` to be used as the id for: + +[source,js] +-------------------------------------------------- +{ + "message" : "You know, for Search", + "post_id" : "1" +} +-------------------------------------------------- + +This does require an additional lightweight parsing step while indexing, +in order to extract the id to decide which shard the index operation +will be executed on. diff --git a/docs/reference/mapping/fields/index-field.asciidoc b/docs/reference/mapping/fields/index-field.asciidoc new file mode 100644 index 0000000..96a320b --- /dev/null +++ b/docs/reference/mapping/fields/index-field.asciidoc @@ -0,0 +1,15 @@ +[[mapping-index-field]] +=== `_index` + +The ability to store in a document the index it belongs to. By default +it is disabled, in order to enable it, the following mapping should be +defined: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_index" : { "enabled" : true } + } +} +-------------------------------------------------- diff --git a/docs/reference/mapping/fields/parent-field.asciidoc b/docs/reference/mapping/fields/parent-field.asciidoc new file mode 100644 index 0000000..3225b53 --- /dev/null +++ b/docs/reference/mapping/fields/parent-field.asciidoc @@ -0,0 +1,21 @@ +[[mapping-parent-field]] +=== `_parent` + +The parent field mapping is defined on a child mapping, and points to +the parent type this child relates to. For example, in case of a `blog` +type and a `blog_tag` type child document, the mapping for `blog_tag` +should be: + +[source,js] +-------------------------------------------------- +{ + "blog_tag" : { + "_parent" : { + "type" : "blog" + } + } +} +-------------------------------------------------- + +The mapping is automatically stored and indexed (meaning it can be +searched on using the `_parent` field notation). diff --git a/docs/reference/mapping/fields/routing-field.asciidoc b/docs/reference/mapping/fields/routing-field.asciidoc new file mode 100644 index 0000000..8ca2286 --- /dev/null +++ b/docs/reference/mapping/fields/routing-field.asciidoc @@ -0,0 +1,69 @@ +[[mapping-routing-field]] +=== `_routing` + +The routing field allows to control the `_routing` aspect when indexing +data and explicit routing control is required. + +[float] +==== store / index + +The first thing the `_routing` mapping does is to store the routing +value provided (`store` set to `false`) and index it (`index` set to +`not_analyzed`). The reason why the routing is stored by default is so +reindexing data will be possible if the routing value is completely +external and not part of the docs. + +[float] +==== required + +Another aspect of the `_routing` mapping is the ability to define it as +required by setting `required` to `true`. This is very important to set +when using routing features, as it allows different APIs to make use of +it. For example, an index operation will be rejected if no routing value +has been provided (or derived from the doc). A delete operation will be +broadcasted to all shards if no routing value is provided and `_routing` +is required. + +[float] +==== path + +The routing value can be provided as an external value when indexing +(and still stored as part of the document, in much the same way +`_source` is stored). But, it can also be automatically extracted from +the index doc based on a `path`. For example, having the following +mapping: + +[source,js] +-------------------------------------------------- +{ + "comment" : { + "_routing" : { + "required" : true, + "path" : "blog.post_id" + } + } +} +-------------------------------------------------- + +Will cause the following doc to be routed based on the `111222` value: + +[source,js] +-------------------------------------------------- +{ + "text" : "the comment text" + "blog" : { + "post_id" : "111222" + } +} +-------------------------------------------------- + +Note, using `path` without explicit routing value provided required an +additional (though quite fast) parsing phase. + +[float] +==== id uniqueness + +When indexing documents specifying a custom `_routing`, the uniqueness +of the `_id` is not guaranteed throughout all the shards that the index +is composed of. In fact, documents with the same `_id` might end up in +different shards if indexed with different `_routing` values. diff --git a/docs/reference/mapping/fields/size-field.asciidoc b/docs/reference/mapping/fields/size-field.asciidoc new file mode 100644 index 0000000..7abfd40 --- /dev/null +++ b/docs/reference/mapping/fields/size-field.asciidoc @@ -0,0 +1,26 @@ +[[mapping-size-field]] +=== `_size` + +The `_size` field allows to automatically index the size of the original +`_source` indexed. By default, it's disabled. In order to enable it, set +the mapping to: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_size" : {"enabled" : true} + } +} +-------------------------------------------------- + +In order to also store it, use: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_size" : {"enabled" : true, "store" : true } + } +} +-------------------------------------------------- diff --git a/docs/reference/mapping/fields/source-field.asciidoc b/docs/reference/mapping/fields/source-field.asciidoc new file mode 100644 index 0000000..22bb963 --- /dev/null +++ b/docs/reference/mapping/fields/source-field.asciidoc @@ -0,0 +1,41 @@ +[[mapping-source-field]] +=== `_source` + +The `_source` field is an automatically generated field that stores the +actual JSON that was used as the indexed document. It is not indexed +(searchable), just stored. When executing "fetch" requests, like +<<docs-get,get>> or +<<search-search,search>>, the `_source` field is +returned by default. + +Though very handy to have around, the source field does incur storage +overhead within the index. For this reason, it can be disabled. For +example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_source" : {"enabled" : false} + } +} +-------------------------------------------------- + +[float] +[[include-exclude]] +==== Includes / Excludes + +Allow to specify paths in the source that would be included / excluded +when it's stored, supporting `*` as wildcard annotation. For example: + +[source,js] +-------------------------------------------------- +{ + "my_type" : { + "_source" : { + "includes" : ["path1.*", "path2.*"], + "excludes" : ["pat3.*"] + } + } +} +-------------------------------------------------- diff --git a/docs/reference/mapping/fields/timestamp-field.asciidoc b/docs/reference/mapping/fields/timestamp-field.asciidoc new file mode 100644 index 0000000..97bca8d --- /dev/null +++ b/docs/reference/mapping/fields/timestamp-field.asciidoc @@ -0,0 +1,82 @@ +[[mapping-timestamp-field]] +=== `_timestamp` + +The `_timestamp` field allows to automatically index the timestamp of a +document. It can be provided externally via the index request or in the +`_source`. If it is not provided externally it will be automatically set +to the date the document was processed by the indexing chain. + +[float] +==== enabled + +By default it is disabled, in order to enable it, the following mapping +should be defined: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_timestamp" : { "enabled" : true } + } +} +-------------------------------------------------- + +[float] +==== store / index + +By default the `_timestamp` field has `store` set to `false` and `index` +set to `not_analyzed`. It can be queried as a standard date field. + +[float] +==== path + +The `_timestamp` value can be provided as an external value when +indexing. But, it can also be automatically extracted from the document +to index based on a `path`. For example, having the following mapping: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_timestamp" : { + "enabled" : true, + "path" : "post_date" + } + } +} +-------------------------------------------------- + +Will cause `2009-11-15T14:12:12` to be used as the timestamp value for: + +[source,js] +-------------------------------------------------- +{ + "message" : "You know, for Search", + "post_date" : "2009-11-15T14:12:12" +} +-------------------------------------------------- + +Note, using `path` without explicit timestamp value provided require an +additional (though quite fast) parsing phase. + +[float] +==== format + +You can define the <<mapping-date-format,date +format>> used to parse the provided timestamp value. For example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_timestamp" : { + "enabled" : true, + "path" : "post_date", + "format" : "YYYY-MM-dd" + } + } +} +-------------------------------------------------- + +Note, the default format is `dateOptionalTime`. The timestamp value will +first be parsed as a number and if it fails the format will be tried. diff --git a/docs/reference/mapping/fields/ttl-field.asciidoc b/docs/reference/mapping/fields/ttl-field.asciidoc new file mode 100644 index 0000000..d47aaca --- /dev/null +++ b/docs/reference/mapping/fields/ttl-field.asciidoc @@ -0,0 +1,70 @@ +[[mapping-ttl-field]] +=== `_ttl` + +A lot of documents naturally come with an expiration date. Documents can +therefore have a `_ttl` (time to live), which will cause the expired +documents to be deleted automatically. + +[float] +==== enabled + +By default it is disabled, in order to enable it, the following mapping +should be defined: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_ttl" : { "enabled" : true } + } +} +-------------------------------------------------- + +[float] +==== store / index + +By default the `_ttl` field has `store` set to `true` and `index` set to +`not_analyzed`. Note that `index` property has to be set to +`not_analyzed` in order for the purge process to work. + +[float] +==== default + +You can provide a per index/type default `_ttl` value as follows: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_ttl" : { "enabled" : true, "default" : "1d" } + } +} +-------------------------------------------------- + +In this case, if you don't provide a `_ttl` value in your query or in +the `_source` all tweets will have a `_ttl` of one day. + +In case you do not specify a time unit like `d` (days), `m` (minutes), +`h` (hours), `ms` (milliseconds) or `w` (weeks), milliseconds is used as +default unit. + +If no `default` is set and no `_ttl` value is given then the document +has an infinite `_ttl` and will not expire. + +You can dynamically update the `default` value using the put mapping +API. It won't change the `_ttl` of already indexed documents but will be +used for future documents. + +[float] +==== Note on documents expiration + +Expired documents will be automatically deleted regularly. You can +dynamically set the `indices.ttl.interval` to fit your needs. The +default value is `60s`. + +The deletion orders are processed by bulk. You can set +`indices.ttl.bulk_size` to fit your needs. The default value is `10000`. + +Note that the expiration procedure handle versioning properly so if a +document is updated between the collection of documents to expire and +the delete order, the document won't be deleted. diff --git a/docs/reference/mapping/fields/type-field.asciidoc b/docs/reference/mapping/fields/type-field.asciidoc new file mode 100644 index 0000000..bac7457 --- /dev/null +++ b/docs/reference/mapping/fields/type-field.asciidoc @@ -0,0 +1,31 @@ +[[mapping-type-field]] +=== Type Field + +Each document indexed is associated with an id and a type. The type, +when indexing, is automatically indexed into a `_type` field. By +default, the `_type` field is indexed (but *not* analyzed) and not +stored. This means that the `_type` field can be queried. + +The `_type` field can be stored as well, for example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_type" : {"store" : true} + } +} +-------------------------------------------------- + +The `_type` field can also not be indexed, and all the APIs will still +work except for specific queries (term queries / filters) or faceting +done on the `_type` field. + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_type" : {"index" : "no"} + } +} +-------------------------------------------------- diff --git a/docs/reference/mapping/fields/uid-field.asciidoc b/docs/reference/mapping/fields/uid-field.asciidoc new file mode 100644 index 0000000..f9ce245 --- /dev/null +++ b/docs/reference/mapping/fields/uid-field.asciidoc @@ -0,0 +1,11 @@ +[[mapping-uid-field]] +=== `_uid` + +Each document indexed is associated with an id and a type, the internal +`_uid` field is the unique identifier of a document within an index and +is composed of the type and the id (meaning that different types can +have the same id and still maintain uniqueness). + +The `_uid` field is automatically used when `_type` is not indexed to +perform type based filtering, and does not require the `_id` to be +indexed. diff --git a/docs/reference/mapping/meta.asciidoc b/docs/reference/mapping/meta.asciidoc new file mode 100644 index 0000000..5cb0c14 --- /dev/null +++ b/docs/reference/mapping/meta.asciidoc @@ -0,0 +1,25 @@ +[[mapping-meta]] +== Meta + +Each mapping can have custom meta data associated with it. These are +simple storage elements that are simply persisted along with the mapping +and can be retrieved when fetching the mapping definition. The meta is +defined under the `_meta` element, for example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "_meta" : { + "attr1" : "value1", + "attr2" : { + "attr3" : "value3" + } + } + } +} +-------------------------------------------------- + +Meta can be handy for example for client libraries that perform +serialization and deserialization to store its meta model (for example, +the class the document maps to). diff --git a/docs/reference/mapping/types.asciidoc b/docs/reference/mapping/types.asciidoc new file mode 100644 index 0000000..0cc967e --- /dev/null +++ b/docs/reference/mapping/types.asciidoc @@ -0,0 +1,24 @@ +[[mapping-types]] +== Types + +The datatype for each field in a document (eg strings, numbers, +objects etc) can be controlled via the type mapping. + +include::types/core-types.asciidoc[] + +include::types/array-type.asciidoc[] + +include::types/object-type.asciidoc[] + +include::types/root-object-type.asciidoc[] + +include::types/nested-type.asciidoc[] + +include::types/ip-type.asciidoc[] + +include::types/geo-point-type.asciidoc[] + +include::types/geo-shape-type.asciidoc[] + +include::types/attachment-type.asciidoc[] + diff --git a/docs/reference/mapping/types/array-type.asciidoc b/docs/reference/mapping/types/array-type.asciidoc new file mode 100644 index 0000000..3f887b1 --- /dev/null +++ b/docs/reference/mapping/types/array-type.asciidoc @@ -0,0 +1,74 @@ +[[mapping-array-type]] +=== Array Type + +JSON documents allow to define an array (list) of fields or objects. +Mapping array types could not be simpler since arrays gets automatically +detected and mapping them can be done either with +<<mapping-core-types,Core Types>> or +<<mapping-object-type,Object Type>> mappings. +For example, the following JSON defines several arrays: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "message" : "some arrays in this tweet...", + "tags" : ["elasticsearch", "wow"], + "lists" : [ + { + "name" : "prog_list", + "description" : "programming list" + }, + { + "name" : "cool_list", + "description" : "cool stuff list" + } + ] + } +} +-------------------------------------------------- + +The above JSON has the `tags` property defining a list of a simple +`string` type, and the `lists` property is an `object` type array. Here +is a sample explicit mapping: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "message" : {"type" : "string"}, + "tags" : {"type" : "string", "index_name" : "tag"}, + "lists" : { + "properties" : { + "name" : {"type" : "string"}, + "description" : {"type" : "string"} + } + } + } + } +} +-------------------------------------------------- + +The fact that array types are automatically supported can be shown by +the fact that the following JSON document is perfectly fine: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "message" : "some arrays in this tweet...", + "tags" : "elasticsearch", + "lists" : { + "name" : "prog_list", + "description" : "programming list" + } + } +} +-------------------------------------------------- + +Note also, that thanks to the fact that we used the `index_name` to use +the non plural form (`tag` instead of `tags`), we can actually refer to +the field using the `index_name` as well. For example, we can execute a +query using `tweet.tags:wow` or `tweet.tag:wow`. We could, of course, +name the field as `tag` and skip the `index_name` all together). diff --git a/docs/reference/mapping/types/attachment-type.asciidoc b/docs/reference/mapping/types/attachment-type.asciidoc new file mode 100644 index 0000000..54f9701 --- /dev/null +++ b/docs/reference/mapping/types/attachment-type.asciidoc @@ -0,0 +1,90 @@ +[[mapping-attachment-type]] +=== Attachment Type + +The `attachment` type allows to index different "attachment" type field +(encoded as `base64`), for example, Microsoft Office formats, open +document formats, ePub, HTML, and so on (full list can be found +http://lucene.apache.org/tika/0.10/formats.html[here]). + +The `attachment` type is provided as a +https://github.com/elasticsearch/elasticsearch-mapper-attachments[plugin +extension]. The plugin is a simple zip file that can be downloaded and +placed under `$ES_HOME/plugins` location. It will be automatically +detected and the `attachment` type will be added. + +Note, the `attachment` type is experimental. + +Using the attachment type is simple, in your mapping JSON, simply set a +certain JSON element as attachment, for example: + +[source,js] +-------------------------------------------------- +{ + "person" : { + "properties" : { + "my_attachment" : { "type" : "attachment" } + } + } +} +-------------------------------------------------- + +In this case, the JSON to index can be: + +[source,js] +-------------------------------------------------- +{ + "my_attachment" : "... base64 encoded attachment ..." +} +-------------------------------------------------- + +Or it is possible to use more elaborated JSON if content type or +resource name need to be set explicitly: + +[source,js] +-------------------------------------------------- +{ + "my_attachment" : { + "_content_type" : "application/pdf", + "_name" : "resource/name/of/my.pdf", + "content" : "... base64 encoded attachment ..." + } +} +-------------------------------------------------- + +The `attachment` type not only indexes the content of the doc, but also +automatically adds meta data on the attachment as well (when available). +The metadata supported are: `date`, `title`, `author`, and `keywords`. +They can be queried using the "dot notation", for example: +`my_attachment.author`. + +Both the meta data and the actual content are simple core type mappers +(string, date, ...), thus, they can be controlled in the mappings. For +example: + +[source,js] +-------------------------------------------------- +{ + "person" : { + "properties" : { + "file" : { + "type" : "attachment", + "fields" : { + "file" : {"index" : "no"}, + "date" : {"store" : true}, + "author" : {"analyzer" : "myAnalyzer"} + } + } + } + } +} +-------------------------------------------------- + +In the above example, the actual content indexed is mapped under +`fields` name `file`, and we decide not to index it, so it will only be +available in the `_all` field. The other fields map to their respective +metadata names, but there is no need to specify the `type` (like +`string` or `date`) since it is already known. + +The plugin uses http://lucene.apache.org/tika/[Apache Tika] to parse +attachments, so many formats are supported, listed +http://lucene.apache.org/tika/0.10/formats.html[here]. diff --git a/docs/reference/mapping/types/core-types.asciidoc b/docs/reference/mapping/types/core-types.asciidoc new file mode 100644 index 0000000..90ec792 --- /dev/null +++ b/docs/reference/mapping/types/core-types.asciidoc @@ -0,0 +1,754 @@ +[[mapping-core-types]] +=== Core Types + +Each JSON field can be mapped to a specific core type. JSON itself +already provides us with some typing, with its support for `string`, +`integer`/`long`, `float`/`double`, `boolean`, and `null`. + +The following sample tweet JSON document will be used to explain the +core types: + +[source,js] +-------------------------------------------------- +{ + "tweet" { + "user" : "kimchy" + "message" : "This is a tweet!", + "postDate" : "2009-11-15T14:12:12", + "priority" : 4, + "rank" : 12.3 + } +} +-------------------------------------------------- + +Explicit mapping for the above JSON tweet can be: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "user" : {"type" : "string", "index" : "not_analyzed"}, + "message" : {"type" : "string", "null_value" : "na"}, + "postDate" : {"type" : "date"}, + "priority" : {"type" : "integer"}, + "rank" : {"type" : "float"} + } + } +} +-------------------------------------------------- + +[float] +[[string]] +==== String + +The text based string type is the most basic type, and contains one or +more characters. An example mapping can be: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "message" : { + "type" : "string", + "store" : true, + "index" : "analyzed", + "null_value" : "na" + }, + "user" : { + "type" : "string", + "index" : "not_analyzed", + "norms" : { + "enabled" : false + } + } + } + } +} +-------------------------------------------------- + +The above mapping defines a `string` `message` property/field within the +`tweet` type. The field is stored in the index (so it can later be +retrieved using selective loading when searching), and it gets analyzed +(broken down into searchable terms). If the message has a `null` value, +then the value that will be stored is `na`. There is also a `string` `user` +which is indexed as-is (not broken down into tokens) and has norms +disabled (so that matching this field is a binary decision, no match is +better than another one). + +The following table lists all the attributes that can be used with the +`string` type: + +[cols="<,<",options="header",] +|======================================================================= +|Attribute |Description +|`index_name` |The name of the field that will be stored in the index. +Defaults to the property/field name. + +|`store` |Set to `true` to store actual field in the index, `false` to not +store it. Defaults to `false` (note, the JSON document itself is stored, +and it can be retrieved from it). + +|`index` |Set to `analyzed` for the field to be indexed and searchable +after being broken down into token using an analyzer. `not_analyzed` +means that its still searchable, but does not go through any analysis +process or broken down into tokens. `no` means that it won't be +searchable at all (as an individual field; it may still be included in +`_all`). Setting to `no` disables `include_in_all`. Defaults to +`analyzed`. + +|`doc_values` |Set to `true` to store field values in a column-stride fashion. +Automatically set to `true` when the fielddata format is `doc_values`. + +|`term_vector` |Possible values are `no`, `yes`, `with_offsets`, +`with_positions`, `with_positions_offsets`. Defaults to `no`. + +|`boost` |The boost value. Defaults to `1.0`. + +|`null_value` |When there is a (JSON) null value for the field, use the +`null_value` as the field value. Defaults to not adding the field at +all. + +|`norms.enabled` |Boolean value if norms should be enabled or not. Defaults +to `true` for `analyzed` fields, and to `false` for `not_analyzed` fields. + +|`norms.loading` |Describes how norms should be loaded, possible values are +`eager` and `lazy` (default). It is possible to change the default value to +eager for all fields by configuring the index setting `index.norms.loading` +to `eager`. + +|`index_options` | Allows to set the indexing +options, possible values are `docs` (only doc numbers are indexed), +`freqs` (doc numbers and term frequencies), and `positions` (doc +numbers, term frequencies and positions). Defaults to `positions` for +`analyzed` fields, and to `docs` for `not_analyzed` fields. It +is also possible to set it to `offsets` (doc numbers, term +frequencies, positions and offsets). + +|`analyzer` |The analyzer used to analyze the text contents when +`analyzed` during indexing and when searching using a query string. +Defaults to the globally configured analyzer. + +|`index_analyzer` |The analyzer used to analyze the text contents when +`analyzed` during indexing. + +|`search_analyzer` |The analyzer used to analyze the field when part of +a query string. Can be updated on an existing field. + +|`include_in_all` |Should the field be included in the `_all` field (if +enabled). If `index` is set to `no` this defaults to `false`, otherwise, +defaults to `true` or to the parent `object` type setting. + +|`ignore_above` |The analyzer will ignore strings larger than this size. +Useful for generic `not_analyzed` fields that should ignore long text. + +|`position_offset_gap` |Position increment gap between field instances +with the same field name. Defaults to 0. +|======================================================================= + +The `string` type also support custom indexing parameters associated +with the indexed value. For example: + +[source,js] +-------------------------------------------------- +{ + "message" : { + "_value": "boosted value", + "_boost": 2.0 + } +} +-------------------------------------------------- + +The mapping is required to disambiguate the meaning of the document. +Otherwise, the structure would interpret "message" as a value of type +"object". The key `_value` (or `value`) in the inner document specifies +the real string content that should eventually be indexed. The `_boost` +(or `boost`) key specifies the per field document boost (here 2.0). + +[float] +[[number]] +==== Number + +A number based type supporting `float`, `double`, `byte`, `short`, +`integer`, and `long`. It uses specific constructs within Lucene in +order to support numeric values. The number types have the same ranges +as corresponding +http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html[Java +types]. An example mapping can be: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "rank" : { + "type" : "float", + "null_value" : 1.0 + } + } + } +} +-------------------------------------------------- + +The following table lists all the attributes that can be used with a +numbered type: + +[cols="<,<",options="header",] +|======================================================================= +|Attribute |Description +|`type` |The type of the number. Can be `float`, `double`, `integer`, +`long`, `short`, `byte`. Required. + +|`index_name` |The name of the field that will be stored in the index. +Defaults to the property/field name. + +|`store` |Set to `true` to store actual field in the index, `false` to not +store it. Defaults to `false` (note, the JSON document itself is stored, +and it can be retrieved from it). + +|`index` |Set to `no` if the value should not be indexed. Setting to +`no` disables `include_in_all`. If set to `no` the field can be stored +in `_source`, have `include_in_all` enabled, or `store` should be set to +`true` for this to be useful. + +|`doc_values` |Set to `true` to store field values in a column-stride fashion. +Automatically set to `true` when the fielddata format is `doc_values`. + +|`precision_step` |The precision step (number of terms generated for +each number value). Defaults to `4`. + +|`boost` |The boost value. Defaults to `1.0`. + +|`null_value` |When there is a (JSON) null value for the field, use the +`null_value` as the field value. Defaults to not adding the field at +all. + +|`include_in_all` |Should the field be included in the `_all` field (if +enabled). If `index` is set to `no` this defaults to `false`, otherwise, +defaults to `true` or to the parent `object` type setting. + +|`ignore_malformed` |Ignored a malformed number. Defaults to `false`. + +|`coerce` |Try convert strings to numbers and truncate fractions for integers. Defaults to `true`. + +|======================================================================= + +[float] +[[token_count]] +==== Token Count +The `token_count` type maps to the JSON string type but indexes and stores +the number of tokens in the string rather than the string itself. For +example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "name" : { + "type" : "string", + "fields" : { + "word_count": { + "type" : "token_count", + "store" : "yes", + "analyzer" : "standard" + } + } + } + } + } +} +-------------------------------------------------- + +All the configuration that can be specified for a number can be specified +for a token_count. The only extra configuration is the required +`analyzer` field which specifies which analyzer to use to break the string +into tokens. For best performance, use an analyzer with no token filters. + +[NOTE] +=================================================================== +Technically the `token_count` type sums position increments rather than +counting tokens. This means that even if the analyzer filters out stop +words they are included in the count. +=================================================================== + +[float] +[[date]] +==== Date + +The date type is a special type which maps to JSON string type. It +follows a specific format that can be explicitly set. All dates are +`UTC`. Internally, a date maps to a number type `long`, with the added +parsing stage from string to long and from long to string. An example +mapping: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "postDate" : { + "type" : "date", + "format" : "YYYY-MM-dd" + } + } + } +} +-------------------------------------------------- + +The date type will also accept a long number representing UTC +milliseconds since the epoch, regardless of the format it can handle. + +The following table lists all the attributes that can be used with a +date type: + +[cols="<,<",options="header",] +|======================================================================= +|Attribute |Description +|`index_name` |The name of the field that will be stored in the index. +Defaults to the property/field name. + +|`format` |The <<mapping-date-format,date +format>>. Defaults to `dateOptionalTime`. + +|`store` |Set to `true` to store actual field in the index, `false` to not +store it. Defaults to `false` (note, the JSON document itself is stored, +and it can be retrieved from it). + +|`index` |Set to `no` if the value should not be indexed. Setting to +`no` disables `include_in_all`. If set to `no` the field can be stored +in `_source`, have `include_in_all` enabled, or `store` should be set to +`true` for this to be useful. + +|`doc_values` |Set to `true` to store field values in a column-stride fashion. +Automatically set to `true` when the fielddata format is `doc_values`. + +|`precision_step` |The precision step (number of terms generated for +each number value). Defaults to `4`. + +|`boost` |The boost value. Defaults to `1.0`. + +|`null_value` |When there is a (JSON) null value for the field, use the +`null_value` as the field value. Defaults to not adding the field at +all. + +|`include_in_all` |Should the field be included in the `_all` field (if +enabled). If `index` is set to `no` this defaults to `false`, otherwise, +defaults to `true` or to the parent `object` type setting. + +|`ignore_malformed` |Ignored a malformed number. Defaults to `false`. + +|======================================================================= + +[float] +[[boolean]] +==== Boolean + +The boolean type Maps to the JSON boolean type. It ends up storing +within the index either `T` or `F`, with automatic translation to `true` +and `false` respectively. + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "hes_my_special_tweet" : { + "type" : "boolean", + } + } + } +} +-------------------------------------------------- + +The boolean type also supports passing the value as a number (in this +case `0` is `false`, all other values are `true`). + +The following table lists all the attributes that can be used with the +boolean type: + +[cols="<,<",options="header",] +|======================================================================= +|Attribute |Description +|`index_name` |The name of the field that will be stored in the index. +Defaults to the property/field name. + +|`store` |Set to `true` to store actual field in the index, `false` to not +store it. Defaults to `false` (note, the JSON document itself is stored, +and it can be retrieved from it). + +|`index` |Set to `no` if the value should not be indexed. Setting to +`no` disables `include_in_all`. If set to `no` the field can be stored +in `_source`, have `include_in_all` enabled, or `store` should be set to +`true` for this to be useful. + +|`boost` |The boost value. Defaults to `1.0`. + +|`null_value` |When there is a (JSON) null value for the field, use the +`null_value` as the field value. Defaults to not adding the field at +all. + +|`include_in_all` |Should the field be included in the `_all` field (if +enabled). If `index` is set to `no` this defaults to `false`, otherwise, +defaults to `true` or to the parent `object` type setting. +|======================================================================= + +[float] +[[binary]] +==== Binary + +The binary type is a base64 representation of binary data that can be +stored in the index. The field is not stored by default and not indexed at +all. + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "image" : { + "type" : "binary", + } + } + } +} +-------------------------------------------------- + +The following table lists all the attributes that can be used with the +binary type: + +[cols="<,<",options="header",] +|======================================================================= +|Attribute |Description +|`index_name` |The name of the field that will be stored in the index. +Defaults to the property/field name. +|`store` |Set to `true` to store actual field in the index, `false` to not +store it. Defaults to `false` (note, the JSON document itself is stored, +and it can be retrieved from it). +|======================================================================= + +[float] +[[fielddata-filters]] +==== Fielddata filters + +It is possible to control which field values are loaded into memory, +which is particularly useful for faceting on string fields, using +fielddata filters, which are explained in detail in the +<<index-modules-fielddata,Fielddata>> section. + +Fielddata filters can exclude terms which do not match a regex, or which +don't fall between a `min` and `max` frequency range: + +[source,js] +-------------------------------------------------- +{ + tweet: { + type: "string", + analyzer: "whitespace" + fielddata: { + filter: { + regex: { + "pattern": "^#.*" + }, + frequency: { + min: 0.001, + max: 0.1, + min_segment_size: 500 + } + } + } + } +} +-------------------------------------------------- + +These filters can be updated on an existing field mapping and will take +effect the next time the fielddata for a segment is loaded. Use the +<<indices-clearcache,Clear Cache>> API +to reload the fielddata using the new filters. + +[float] +[[postings]] +==== Postings format + +Posting formats define how fields are written into the index and how +fields are represented into memory. Posting formats can be defined per +field via the `postings_format` option. Postings format are configurable. +Elasticsearch has several builtin formats: + +`direct`:: + A postings format that uses disk-based storage but loads + its terms and postings directly into memory. Note this postings format + is very memory intensive and has certain limitation that don't allow + segments to grow beyond 2.1GB see \{@link DirectPostingsFormat} for + details. + +`memory`:: + A postings format that stores its entire terms, postings, + positions and payloads in a finite state transducer. This format should + only be used for primary keys or with fields where each term is + contained in a very low number of documents. + +`pulsing`:: + A postings format in-lines the posting lists for very low + frequent terms in the term dictionary. This is useful to improve lookup + performance for low-frequent terms. + +`bloom_default`:: + A postings format that uses a bloom filter to + improve term lookup performance. This is useful for primarily keys or + fields that are used as a delete key. + +`bloom_pulsing`:: + A postings format that combines the advantages of + *bloom* and *pulsing* to further improve lookup performance. + +`default`:: + The default Elasticsearch postings format offering best + general purpose performance. This format is used if no postings format + is specified in the field mapping. + +[float] +===== Postings format example + +On all field types it possible to configure a `postings_format` +attribute: + +[source,js] +-------------------------------------------------- +{ + "person" : { + "properties" : { + "second_person_id" : {"type" : "string", "postings_format" : "pulsing"} + } + } +} +-------------------------------------------------- + +On top of using the built-in posting formats it is possible define +custom postings format. See +<<index-modules-codec,codec module>> for more +information. + +[float] +==== Doc values format + +Doc values formats define how fields are written into column-stride storage in +the index for the purpose of sorting or faceting. Fields that have doc values +enabled will have special field data instances, which will not be uninverted +from the inverted index, but directly read from disk. This makes _refresh faster +and ultimately allows for having field data stored on disk depending on the +configured doc values format. + +Doc values formats are configurable. Elasticsearch has several builtin formats: + +`memory`:: + A doc values format which stores data in memory. Compared to the default + field data implementations, using doc values with this format will have + similar performance but will be faster to load, making '_refresh' less + time-consuming. + +`disk`:: + A doc values format which stores all data on disk, requiring almost no + memory from the JVM at the cost of a slight performance degradation. + +`default`:: + The default Elasticsearch doc values format, offering good performance + with low memory usage. This format is used if no format is specified in + the field mapping. + +[float] +===== Doc values format example + +On all field types, it is possible to configure a `doc_values_format` attribute: + +[source,js] +-------------------------------------------------- +{ + "product" : { + "properties" : { + "price" : {"type" : "integer", "doc_values_format" : "memory"} + } + } +} +-------------------------------------------------- + +On top of using the built-in doc values formats it is possible to define +custom doc values formats. See +<<index-modules-codec,codec module>> for more information. + +[float] +==== Similarity + +Elasticsearch allows you to configure a similarity (scoring algorithm) per field. +Allowing users a simpler extension beyond the usual TF/IDF algorithm. As +part of this, new algorithms have been added including BM25. Also as +part of the changes, it is now possible to define a Similarity per +field, giving even greater control over scoring. + +You can configure similarities via the +<<index-modules-similarity,similarity module>> + +[float] +===== Configuring Similarity per Field + +Defining the Similarity for a field is done via the `similarity` mapping +property, as this example shows: + +[source,js] +-------------------------------------------------- +{ + "book" : { + "properties" : { + "title" : { "type" : "string", "similarity" : "BM25" } + } +} +-------------------------------------------------- + +The following Similarities are configured out-of-box: + +`default`:: + The Default TF/IDF algorithm used by Elasticsearch and + Lucene in previous versions. + +`BM25`:: + The BM25 algorithm. + http://en.wikipedia.org/wiki/Okapi_BM25[See Okapi_BM25] for more + details. + + +[[copy-to]] +[float] +===== Copy to field + +added[1.0.0.RC2] + +Adding `copy_to` parameter to any field mapping will cause all values of this field to be copied to fields specified in +the parameter. In the following example all values from fields `title` and `abstract` will be copied to the field +`meta_data`. + + +[source,js] +-------------------------------------------------- +{ + "book" : { + "properties" : { + "title" : { "type" : "string", "copy_to" : "meta_data" }, + "abstract" : { "type" : "string", "copy_to" : "meta_data" }, + "meta_data" : { "type" : "string" }, + } +} +-------------------------------------------------- + +Multiple fields are also supported: + +[source,js] +-------------------------------------------------- +{ + "book" : { + "properties" : { + "title" : { "type" : "string", "copy_to" : ["meta_data", "article_info"] }, + } +} +-------------------------------------------------- + +[float] +===== Multi fields + +added[1.0.0.RC1] + +The `fields` options allows to map several core types fields into a single +json source field. This can be useful if a single field need to be +used in different ways. For example a single field is to be used for both +free text search and sorting. + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "name" : { + "type" : "string", + "index" : "analyzed", + "fields" : { + "raw" : {"type" : "string", "index" : "not_analyzed"} + } + } + } + } +} +-------------------------------------------------- + +In the above example the field `name` gets processed twice. The first time it gets +processed as an analyzed string and this version is accessible under the field name +`name`, this is the main field and is in fact just like any other field. The second time +it gets processed as a not analyzed string and is accessible under the name `name.raw`. + +[float] +==== Include in All + +The `include_in_all` setting is ignored on any field that is defined in +the `fields` options. Setting the `include_in_all` only makes sense on +the main field, since the raw field value to copied to the `_all` field, +the tokens aren't copied. + +[float] +==== Updating a field + +In the essence a field can't be updated. However multi fields can be +added to existing fields. This allows for example to have a different +`index_analyzer` configuration in addition to the already configured +`index_analyzer` configuration specified in the main and other multi fields. + +Also the new multi field will only be applied on document that have been +added after the multi field has been added and in fact the new multi field +doesn't exist in existing documents. + +Another important note is that new multi fields will be merged into the +list of existing multi fields, so when adding new multi fields for a field +previous added multi fields don't need to be specified. + +[float] +==== Accessing Fields + +deprecated[1.0.0,Use <<copy-to,`copy_to`>> instead] + +The multi fields defined in the `fields` are prefixed with the +name of the main field and can be accessed by their full path using the +navigation notation: `name.raw`, or using the typed navigation notation +`tweet.name.raw`. The `path` option allows to control how fields are accessed. +If the `path` option is set to `full`, then the full path of the main field +is prefixed, but if the `path` option is set to `just_name` the actual +multi field name without any prefix is used. The default value for +the `path` option is `full`. + +The `just_name` setting, among other things, allows indexing content of multiple +fields under the same name. In the example below the content of both fields +`first_name` and `last_name` can be accessed by using `any_name` or `tweet.any_name`. + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties": { + "first_name": { + "type": "string", + "index": "analyzed", + "path": "just_name", + "fields": { + "any_name": {"type": "string","index": "analyzed"} + } + }, + "last_name": { + "type": "string", + "index": "analyzed", + "path": "just_name", + "fields": { + "any_name": {"type": "string","index": "analyzed"} + } + } + } + } +} +-------------------------------------------------- + diff --git a/docs/reference/mapping/types/geo-point-type.asciidoc b/docs/reference/mapping/types/geo-point-type.asciidoc new file mode 100644 index 0000000..19b38e5 --- /dev/null +++ b/docs/reference/mapping/types/geo-point-type.asciidoc @@ -0,0 +1,207 @@ +[[mapping-geo-point-type]] +=== Geo Point Type + +Mapper type called `geo_point` to support geo based points. The +declaration looks as follows: + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "properties" : { + "location" : { + "type" : "geo_point" + } + } + } +} +-------------------------------------------------- + +[float] +==== Indexed Fields + +The `geo_point` mapping will index a single field with the format of +`lat,lon`. The `lat_lon` option can be set to also index the `.lat` and +`.lon` as numeric fields, and `geohash` can be set to `true` to also +index `.geohash` value. + +A good practice is to enable indexing `lat_lon` as well, since both the +geo distance and bounding box filters can either be executed using in +memory checks, or using the indexed lat lon values, and it really +depends on the data set which one performs better. Note though, that +indexed lat lon only make sense when there is a single geo point value +for the field, and not multi values. + +[float] +==== Geohashes + +Geohashes are a form of lat/lon encoding which divides the earth up into +a grid. Each cell in this grid is represented by a geohash string. Each +cell in turn can be further subdivided into smaller cells which are +represented by a longer string. So the longer the geohash, the smaller +(and thus more accurate) the cell is. + +Because geohashes are just strings, they can be stored in an inverted +index like any other string, which makes querying them very efficient. + +If you enable the `geohash` option, a `geohash` ``sub-field'' will be +indexed as, eg `pin.geohash`. The length of the geohash is controlled by +the `geohash_precision` parameter, which can either be set to an absolute +length (eg `12`, the default) or to a distance (eg `1km`). + +More usefully, set the `geohash_prefix` option to `true` to not only index +the geohash value, but all the enclosing cells as well. For instance, a +geohash of `u30` will be indexed as `[u,u3,u30]`. This option can be used +by the <<query-dsl-geohash-cell-filter>> to find geopoints within a +particular cell very efficiently. + +[float] +==== Input Structure + +The above mapping defines a `geo_point`, which accepts different +formats. The following formats are supported: + +[float] +===== Lat Lon as Properties + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "location" : { + "lat" : 41.12, + "lon" : -71.34 + } + } +} +-------------------------------------------------- + +[float] +===== Lat Lon as String + +Format in `lat,lon`. + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "location" : "41.12,-71.34" + } +} +-------------------------------------------------- + +[float] +===== Geohash + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "location" : "drm3btev3e86" + } +} +-------------------------------------------------- + +[float] +===== Lat Lon as Array + +Format in `[lon, lat]`, note, the order of lon/lat here in order to +conform with http://geojson.org/[GeoJSON]. + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "location" : [-71.34, 41.12] + } +} +-------------------------------------------------- + +[float] +==== Mapping Options + +[cols="<,<",options="header",] +|======================================================================= +|Option |Description +|`lat_lon` |Set to `true` to also index the `.lat` and `.lon` as fields. +Defaults to `false`. + +|`geohash` |Set to `true` to also index the `.geohash` as a field. +Defaults to `false`. + +|`geohash_precision` |Sets the geohash precision. It can be set to an +absolute geohash length or a distance value (eg 1km, 1m, 1ml) defining +the size of the smallest cell. Defaults to an absolute length of 12. + +|`geohash_prefix` |If this option is set to `true`, not only the geohash +but also all its parent cells (true prefixes) will be indexed as well. The +number of terms that will be indexed depends on the `geohash_precision`. +Defaults to `false`. *Note*: This option implicitly enables `geohash`. + +|`validate` |Set to `true` to reject geo points with invalid latitude or +longitude (default is `false`) *Note*: Validation only works when +normalization has been disabled. + +|`validate_lat` |Set to `true` to reject geo points with an invalid +latitude + +|`validate_lon` |Set to `true` to reject geo points with an invalid +longitude + +|`normalize` |Set to `true` to normalize latitude and longitude (default +is `true`) + +|`normalize_lat` |Set to `true` to normalize latitude + +|`normalize_lon` |Set to `true` to normalize longitude +|======================================================================= + +[float] +==== Field data + +By default, geo points use the `array` format which loads geo points into two +parallel double arrays, making sure there is no precision loss. However, this +can require a non-negligible amount of memory (16 bytes per document) which is +why Elasticsearch also provides a field data implementation with lossy +compression called `compressed`: + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "properties" : { + "location" : { + "type" : "geo_point", + "fielddata" : { + "format" : "compressed", + "precision" : "1cm" + } + } + } + } +} +-------------------------------------------------- + +This field data format comes with a `precision` option which allows to +configure how much precision can be traded for memory. The default value is +`1cm`. The following table presents values of the memory savings given various +precisions: + +|============================================= +| Precision | Bytes per point | Size reduction +| 1km | 4 | 75% +| 3m | 6 | 62.5% +| 1cm | 8 | 50% +| 1mm | 10 | 37.5% +|============================================= + +Precision can be changed on a live index by using the update mapping API. + +[float] +==== Usage in Scripts + +When using `doc[geo_field_name]` (in the above mapping, +`doc['location']`), the `doc[...].value` returns a `GeoPoint`, which +then allows access to `lat` and `lon` (for example, +`doc[...].value.lat`). For performance, it is better to access the `lat` +and `lon` directly using `doc[...].lat` and `doc[...].lon`. diff --git a/docs/reference/mapping/types/geo-shape-type.asciidoc b/docs/reference/mapping/types/geo-shape-type.asciidoc new file mode 100644 index 0000000..600900a --- /dev/null +++ b/docs/reference/mapping/types/geo-shape-type.asciidoc @@ -0,0 +1,232 @@ +[[mapping-geo-shape-type]] +=== Geo Shape Type + +The `geo_shape` mapping type facilitates the indexing of and searching +with arbitrary geo shapes such as rectangles and polygons. It should be +used when either the data being indexed or the queries being executed +contain shapes other than just points. + +You can query documents using this type using +<<query-dsl-geo-shape-filter,geo_shape Filter>> +or <<query-dsl-geo-shape-query,geo_shape +Query>>. + +Note, the `geo_shape` type uses +https://github.com/spatial4j/spatial4j[Spatial4J] and +http://www.vividsolutions.com/jts/jtshome.htm[JTS], both of which are +optional dependencies. Consequently you must add Spatial4J v0.3 and JTS +v1.12 to your classpath in order to use this type. + +[float] +==== Mapping Options + +The geo_shape mapping maps geo_json geometry objects to the geo_shape +type. To enable it, users must explicitly map fields to the geo_shape +type. + +[cols="<,<",options="header",] +|======================================================================= +|Option |Description + +|`tree` |Name of the PrefixTree implementation to be used: `geohash` for +GeohashPrefixTree and `quadtree` for QuadPrefixTree. Defaults to +`geohash`. + +|`precision` |This parameter may be used instead of `tree_levels` to set +an appropriate value for the `tree_levels` parameter. The value +specifies the desired precision and Elasticsearch will calculate the +best tree_levels value to honor this precision. The value should be a +number followed by an optional distance unit. Valid distance units +include: `in`, `inch`, `yd`, `yard`, `mi`, `miles`, `km`, `kilometers`, +`m`,`meters` (default), `cm`,`centimeters`, `mm`, `millimeters`. + +|`tree_levels` |Maximum number of layers to be used by the PrefixTree. +This can be used to control the precision of shape representations and +therefore how many terms are indexed. Defaults to the default value of +the chosen PrefixTree implementation. Since this parameter requires a +certain level of understanding of the underlying implementation, users +may use the `precision` parameter instead. However, Elasticsearch only +uses the tree_levels parameter internally and this is what is returned +via the mapping API even if you use the precision parameter. + +|`distance_error_pct` |Used as a hint to the PrefixTree about how +precise it should be. Defaults to 0.025 (2.5%) with 0.5 as the maximum +supported value. +|======================================================================= + +[float] +==== Prefix trees + +To efficiently represent shapes in the index, Shapes are converted into +a series of hashes representing grid squares using implementations of a +PrefixTree. The tree notion comes from the fact that the PrefixTree uses +multiple grid layers, each with an increasing level of precision to +represent the Earth. + +Multiple PrefixTree implementations are provided: + +* GeohashPrefixTree - Uses +http://en.wikipedia.org/wiki/Geohash[geohashes] for grid squares. +Geohashes are base32 encoded strings of the bits of the latitude and +longitude interleaved. So the longer the hash, the more precise it is. +Each character added to the geohash represents another tree level and +adds 5 bits of precision to the geohash. A geohash represents a +rectangular area and has 32 sub rectangles. The maximum amount of levels +in Elasticsearch is 24. +* QuadPrefixTree - Uses a +http://en.wikipedia.org/wiki/Quadtree[quadtree] for grid squares. +Similar to geohash, quad trees interleave the bits of the latitude and +longitude the resulting hash is a bit set. A tree level in a quad tree +represents 2 bits in this bit set, one for each coordinate. The maximum +amount of levels for the quad trees in Elasticsearch is 50. + +[float] +===== Accuracy + +Geo_shape does not provide 100% accuracy and depending on how it is +configured it may return some false positives or false negatives for +certain queries. To mitigate this, it is important to select an +appropriate value for the tree_levels parameter and to adjust +expectations accordingly. For example, a point may be near the border of +a particular grid cell. And may not match a query that only matches the +cell right next to it even though the shape is very close to the point. + +[float] +===== Example + +[source,js] +-------------------------------------------------- +{ + "properties": { + "location": { + "type": "geo_shape", + "tree": "quadtree", + "precision": "1m" + } + } +} +-------------------------------------------------- + +This mapping maps the location field to the geo_shape type using the +quad_tree implementation and a precision of 1m. Elasticsearch translates +this into a tree_levels setting of 26. + +[float] +===== Performance considerations + +Elasticsearch uses the paths in the prefix tree as terms in the index +and in queries. The higher the levels is (and thus the precision), the +more terms are generated. Both calculating the terms, keeping them in +memory, and storing them has a price of course. Especially with higher +tree levels, indices can become extremely large even with a modest +amount of data. Additionally, the size of the features also matters. +Big, complex polygons can take up a lot of space at higher tree levels. +Which setting is right depends on the use case. Generally one trades off +accuracy against index size and query performance. + +The defaults in Elasticsearch for both implementations are a compromise +between index size and a reasonable level of precision of 50m at the +equator. This allows for indexing tens of millions of shapes without +overly bloating the resulting index too much relative to the input size. + +[float] +==== Input Structure + +The http://www.geojson.org[GeoJSON] format is used to represent Shapes +as input as follows: + +[source,js] +-------------------------------------------------- +{ + "location" : { + "type" : "point", + "coordinates" : [45.0, -45.0] + } +} +-------------------------------------------------- + +Note, both the `type` and `coordinates` fields are required. + +The supported `types` are `point`, `linestring`, `polygon`, `multipoint` +and `multipolygon`. + +Note, in geojson the correct order is longitude, latitude coordinate +arrays. This differs from some APIs such as e.g. Google Maps that +generally use latitude, longitude. + +[float] +===== Envelope + +Elasticsearch supports an `envelope` type which consists of coordinates +for upper left and lower right points of the shape: + +[source,js] +-------------------------------------------------- +{ + "location" : { + "type" : "envelope", + "coordinates" : [[-45.0, 45.0], [45.0, -45.0]] + } +} +-------------------------------------------------- + +[float] +===== http://www.geojson.org/geojson-spec.html#id4[Polygon] + +A polygon is defined by a list of a list of points. The first and last +points in each list must be the same (the polygon must be closed). + +[source,js] +-------------------------------------------------- +{ + "location" : { + "type" : "polygon", + "coordinates" : [ + [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ] + ] + } +} +-------------------------------------------------- + +The first array represents the outer boundary of the polygon, the other +arrays represent the interior shapes ("holes"): + +[source,js] +-------------------------------------------------- +{ + "location" : { + "type" : "polygon", + "coordinates" : [ + [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ], + [ [100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2] ] + ] + } +} +-------------------------------------------------- + +[float] +===== http://www.geojson.org/geojson-spec.html#id7[MultiPolygon] + +A list of geojson polygons. + +[source,js] +-------------------------------------------------- +{ + "location" : { + "type" : "multipolygon", + "coordinates" : [ + [[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]], + [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]], + [[100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2]]] + ] + } +} +-------------------------------------------------- + +[float] +==== Sorting and Retrieving index Shapes + +Due to the complex input structure and index representation of shapes, +it is not currently possible to sort shapes or retrieve their fields +directly. The geo_shape value is only retrievable through the `_source` +field. diff --git a/docs/reference/mapping/types/ip-type.asciidoc b/docs/reference/mapping/types/ip-type.asciidoc new file mode 100644 index 0000000..51f3c5a --- /dev/null +++ b/docs/reference/mapping/types/ip-type.asciidoc @@ -0,0 +1,36 @@ +[[mapping-ip-type]] +=== IP Type + +An `ip` mapping type allows to store _ipv4_ addresses in a numeric form +allowing to easily sort, and range query it (using ip values). + +The following table lists all the attributes that can be used with an ip +type: + +[cols="<,<",options="header",] +|======================================================================= +|Attribute |Description +|`index_name` |The name of the field that will be stored in the index. +Defaults to the property/field name. + +|`store` |Set to `true` to store actual field in the index, `false` to not +store it. Defaults to `false` (note, the JSON document itself is stored, +and it can be retrieved from it). + +|`index` |Set to `no` if the value should not be indexed. In this case, +`store` should be set to `true`, since if it's not indexed and not +stored, there is nothing to do with it. + +|`precision_step` |The precision step (number of terms generated for +each number value). Defaults to `4`. + +|`boost` |The boost value. Defaults to `1.0`. + +|`null_value` |When there is a (JSON) null value for the field, use the +`null_value` as the field value. Defaults to not adding the field at +all. + +|`include_in_all` |Should the field be included in the `_all` field (if +enabled). Defaults to `true` or to the parent `object` type setting. +|======================================================================= + diff --git a/docs/reference/mapping/types/nested-type.asciidoc b/docs/reference/mapping/types/nested-type.asciidoc new file mode 100644 index 0000000..17d8a13 --- /dev/null +++ b/docs/reference/mapping/types/nested-type.asciidoc @@ -0,0 +1,81 @@ +[[mapping-nested-type]] +=== Nested Type + +Nested objects/documents allow to map certain sections in the document +indexed as nested allowing to query them as if they are separate docs +joining with the parent owning doc. + +One of the problems when indexing inner objects that occur several times +in a doc is that "cross object" search match will occur, for example: + +[source,js] +-------------------------------------------------- +{ + "obj1" : [ + { + "name" : "blue", + "count" : 4 + }, + { + "name" : "green", + "count" : 6 + } + ] +} +-------------------------------------------------- + +Searching for name set to blue and count higher than 5 will match the +doc, because in the first element the name matches blue, and in the +second element, count matches "higher than 5". + +Nested mapping allows mapping certain inner objects (usually multi +instance ones), for example: + +[source,js] +-------------------------------------------------- +{ + "type1" : { + "properties" : { + "obj1" : { + "type" : "nested" + } + } + } +} +-------------------------------------------------- + +The above will cause all `obj1` to be indexed as a nested doc. The +mapping is similar in nature to setting `type` to `object`, except that +it's `nested`. + +Note: changing an object type to nested type requires reindexing. + +The `nested` object fields can also be automatically added to the +immediate parent by setting `include_in_parent` to true, and also +included in the root object by setting `include_in_root` to true. + +Nested docs will also automatically use the root doc `_all` field. + +Searching on nested docs can be done using either the +<<query-dsl-nested-query,nested query>> or +<<query-dsl-nested-filter,nested filter>>. + +[float] +==== Internal Implementation + +Internally, nested objects are indexed as additional documents, but, +since they can be guaranteed to be indexed within the same "block", it +allows for extremely fast joining with parent docs. + +Those internal nested documents are automatically masked away when doing +operations against the index (like searching with a match_all query), +and they bubble out when using the nested query. + +Because nested docs are always masked to the parent doc, the nested docs +can never be accessed outside the scope of the `nested` query. For example +stored fields can be enabled on fields inside nested objects, but there is +no way of retrieving them, since stored fields are fetched outside of +the `nested` query scope. + +The `_source` field is always associated with the parent document and +because of that field values via the source can be fetched for nested object. diff --git a/docs/reference/mapping/types/object-type.asciidoc b/docs/reference/mapping/types/object-type.asciidoc new file mode 100644 index 0000000..ce28239 --- /dev/null +++ b/docs/reference/mapping/types/object-type.asciidoc @@ -0,0 +1,244 @@ +[[mapping-object-type]] +=== Object Type + +JSON documents are hierarchical in nature, allowing them to define inner +"objects" within the actual JSON. Elasticsearch completely understands +the nature of these inner objects and can map them easily, providing +query support for their inner fields. Because each document can have +objects with different fields each time, objects mapped this way are +known as "dynamic". Dynamic mapping is enabled by default. Let's take +the following JSON as an example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "person" : { + "name" : { + "first_name" : "Shay", + "last_name" : "Banon" + }, + "sid" : "12345" + }, + "message" : "This is a tweet!" + } +} +-------------------------------------------------- + +The above shows an example where a tweet includes the actual `person` +details. A `person` is an object, with a `sid`, and a `name` object +which has `first_name` and `last_name`. It's important to note that +`tweet` is also an object, although it is a special +<<mapping-root-object-type,root object type>> +which allows for additional mapping definitions. + +The following is an example of explicit mapping for the above JSON: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "person" : { + "type" : "object", + "properties" : { + "name" : { + "properties" : { + "first_name" : {"type" : "string"}, + "last_name" : {"type" : "string"} + } + }, + "sid" : {"type" : "string", "index" : "not_analyzed"} + } + }, + "message" : {"type" : "string"} + } + } +} +-------------------------------------------------- + +In order to mark a mapping of type `object`, set the `type` to object. +This is an optional step, since if there are `properties` defined for +it, it will automatically be identified as an `object` mapping. + +[float] +==== properties + +An object mapping can optionally define one or more properties using the +`properties` tag for a field. Each property can be either another +`object`, or one of the +<<mapping-core-types,core_types>>. + +[float] +==== dynamic + +One of the most important features of Elasticsearch is its ability to be +schema-less. This means that, in our example above, the `person` object +can be indexed later with a new property -- `age`, for example -- and it +will automatically be added to the mapping definitions. Same goes for +the `tweet` root object. + +This feature is by default turned on, and it's the `dynamic` nature of +each object mapped. Each object mapped is automatically dynamic, though +it can be explicitly turned off: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "person" : { + "type" : "object", + "properties" : { + "name" : { + "dynamic" : false, + "properties" : { + "first_name" : {"type" : "string"}, + "last_name" : {"type" : "string"} + } + }, + "sid" : {"type" : "string", "index" : "not_analyzed"} + } + }, + "message" : {"type" : "string"} + } + } +} +-------------------------------------------------- + +In the above example, the `name` object mapped is not dynamic, meaning +that if, in the future, we try to index JSON with a `middle_name` within +the `name` object, it will get discarded and not added. + +There is no performance overhead if an `object` is dynamic, the ability +to turn it off is provided as a safety mechanism so "malformed" objects +won't, by mistake, index data that we do not wish to be indexed. + +If a dynamic object contains yet another inner `object`, it will be +automatically added to the index and mapped as well. + +When processing dynamic new fields, their type is automatically derived. +For example, if it is a `number`, it will automatically be treated as +number <<mapping-core-types,core_type>>. Dynamic +fields default to their default attributes, for example, they are not +stored and they are always indexed. + +Date fields are special since they are represented as a `string`. Date +fields are detected if they can be parsed as a date when they are first +introduced into the system. The set of date formats that are tested +against can be configured using the `dynamic_date_formats` on the root object, +which is explained later. + +Note, once a field has been added, *its type can not change*. For +example, if we added age and its value is a number, then it can't be +treated as a string. + +The `dynamic` parameter can also be set to `strict`, meaning that not +only new fields will not be introduced into the mapping, parsing +(indexing) docs with such new fields will fail. + +[float] +==== enabled + +The `enabled` flag allows to disable parsing and indexing a named object +completely. This is handy when a portion of the JSON document contains +arbitrary JSON which should not be indexed, nor added to the mapping. +For example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "properties" : { + "person" : { + "type" : "object", + "properties" : { + "name" : { + "type" : "object", + "enabled" : false + }, + "sid" : {"type" : "string", "index" : "not_analyzed"} + } + }, + "message" : {"type" : "string"} + } + } +} +-------------------------------------------------- + +In the above, `name` and its content will not be indexed at all. + + +[float] +==== include_in_all + +`include_in_all` can be set on the `object` type level. When set, it +propagates down to all the inner mapping defined within the `object` +that do no explicitly set it. + +[float] +==== path + +deprecated[1.0.0,Use <<copy-to,`copy_to`>> instead] + +In the <<mapping-core-types,core_types>> +section, a field can have a `index_name` associated with it in order to +control the name of the field that will be stored within the index. When +that field exists within an object(s) that are not the root object, the +name of the field of the index can either include the full "path" to the +field with its `index_name`, or just the `index_name`. For example +(under mapping of _type_ `person`, removed the tweet type for clarity): + +[source,js] +-------------------------------------------------- +{ + "person" : { + "properties" : { + "name1" : { + "type" : "object", + "path" : "just_name", + "properties" : { + "first1" : {"type" : "string"}, + "last1" : {"type" : "string", "index_name" : "i_last_1"} + } + }, + "name2" : { + "type" : "object", + "path" : "full", + "properties" : { + "first2" : {"type" : "string"}, + "last2" : {"type" : "string", "index_name" : "i_last_2"} + } + } + } + } +} +-------------------------------------------------- + +In the above example, the `name1` and `name2` objects within the +`person` object have different combination of `path` and `index_name`. +The document fields that will be stored in the index as a result of that +are: + +[cols="<,<",options="header",] +|================================= +|JSON Name |Document Field Name +|`name1`/`first1` |`first1` +|`name1`/`last1` |`i_last_1` +|`name2`/`first2` |`name2.first2` +|`name2`/`last2` |`name2.i_last_2` +|================================= + +Note, when querying or using a field name in any of the APIs provided +(search, query, selective loading, ...), there is an automatic detection +from logical full path and into the `index_name` and vice versa. For +example, even though `name1`/`last1` defines that it is stored with +`just_name` and a different `index_name`, it can either be referred to +using `name1.last1` (logical name), or its actual indexed name of +`i_last_1`. + +More over, where applicable, for example, in queries, the full path +including the type can be used such as `person.name.last1`, in this +case, both the actual indexed name will be resolved to match against the +index, and an automatic query filter will be added to only match +`person` types. diff --git a/docs/reference/mapping/types/root-object-type.asciidoc b/docs/reference/mapping/types/root-object-type.asciidoc new file mode 100644 index 0000000..ac368c4 --- /dev/null +++ b/docs/reference/mapping/types/root-object-type.asciidoc @@ -0,0 +1,224 @@ +[[mapping-root-object-type]] +=== Root Object Type + +The root object mapping is an +<<mapping-object-type,object type mapping>> that +maps the root object (the type itself). On top of all the different +mappings that can be set using the +<<mapping-object-type,object type mapping>>, it +allows for additional, type level mapping definitions. + +The root object mapping allows to index a JSON document that either +starts with the actual mapping type, or only contains its fields. For +example, the following `tweet` JSON can be indexed: + +[source,js] +-------------------------------------------------- +{ + "message" : "This is a tweet!" +} +-------------------------------------------------- + +But, also the following JSON can be indexed: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "message" : "This is a tweet!" + } +} +-------------------------------------------------- + +Out of the two, it is preferable to use the document *without* the type +explicitly set. + +[float] +==== Index / Search Analyzers + +The root object allows to define type mapping level analyzers for index +and search that will be used with all different fields that do not +explicitly set analyzers on their own. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "index_analyzer" : "standard", + "search_analyzer" : "standard" + } +} +-------------------------------------------------- + +The above simply explicitly defines both the `index_analyzer` and +`search_analyzer` that will be used. There is also an option to use the +`analyzer` attribute to set both the `search_analyzer` and +`index_analyzer`. + +[float] +==== dynamic_date_formats + +`dynamic_date_formats` (old setting called `date_formats` still works) +is the ability to set one or more date formats that will be used to +detect `date` fields. For example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "dynamic_date_formats" : ["yyyy-MM-dd", "dd-MM-yyyy"], + "properties" : { + "message" : {"type" : "string"} + } + } +} +-------------------------------------------------- + +In the above mapping, if a new JSON field of type string is detected, +the date formats specified will be used in order to check if its a date. +If it passes parsing, then the field will be declared with `date` type, +and will use the matching format as its format attribute. The date +format itself is explained +<<mapping-date-format,here>>. + +The default formats are: `dateOptionalTime` (ISO) and +`yyyy/MM/dd HH:mm:ss Z||yyyy/MM/dd Z`. + +*Note:* `dynamic_date_formats` are used *only* for dynamically added +date fields, not for `date` fields that you specify in your mapping. + +[float] +==== date_detection + +Allows to disable automatic date type detection (a new field introduced +and matches the provided format), for example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "date_detection" : false, + "properties" : { + "message" : {"type" : "string"} + } + } +} +-------------------------------------------------- + +[float] +==== numeric_detection + +Sometimes, even though json has support for native numeric types, +numeric values are still provided as strings. In order to try and +automatically detect numeric values from string, the `numeric_detection` +can be set to `true`. For example: + +[source,js] +-------------------------------------------------- +{ + "tweet" : { + "numeric_detection" : true, + "properties" : { + "message" : {"type" : "string"} + } + } +} +-------------------------------------------------- + +[float] +==== dynamic_templates + +Dynamic templates allow to define mapping templates that will be applied +when dynamic introduction of fields / objects happens. + +For example, we might want to have all fields to be stored by default, +or all `string` fields to be stored, or have `string` fields to always +be indexed with multi fields syntax, once analyzed and once not_analyzed. +Here is a simple example: + +[source,js] +-------------------------------------------------- +{ + "person" : { + "dynamic_templates" : [ + { + "template_1" : { + "match" : "multi*", + "mapping" : { + "type" : "{dynamic_type}", + "index" : "analyzed", + "fields" : { + "org" : {"type": "{dynamic_type}", "index" : "not_analyzed"} + } + } + } + }, + { + "template_2" : { + "match" : "*", + "match_mapping_type" : "string", + "mapping" : { + "type" : "string", + "index" : "not_analyzed" + } + } + } + ] + } +} +-------------------------------------------------- + +The above mapping will create a field with multi fields for all field +names starting with multi, and will map all `string` types to be +`not_analyzed`. + +Dynamic templates are named to allow for simple merge behavior. A new +mapping, just with a new template can be "put" and that template will be +added, or if it has the same name, the template will be replaced. + +The `match` allow to define matching on the field name. An `unmatch` +option is also available to exclude fields if they do match on `match`. +The `match_mapping_type` controls if this template will be applied only +for dynamic fields of the specified type (as guessed by the json +format). + +Another option is to use `path_match`, which allows to match the dynamic +template against the "full" dot notation name of the field (for example +`obj1.*.value` or `obj1.obj2.*`), with the respective `path_unmatch`. + +The format of all the matching is simple format, allowing to use * as a +matching element supporting simple patterns such as xxx*, *xxx, xxx*yyy +(with arbitrary number of pattern types), as well as direct equality. +The `match_pattern` can be set to `regex` to allow for regular +expression based matching. + +The `mapping` element provides the actual mapping definition. The +`{name}` keyword can be used and will be replaced with the actual +dynamic field name being introduced. The `{dynamic_type}` (or +`{dynamicType}`) can be used and will be replaced with the mapping +derived based on the field type (or the derived type, like `date`). + +Complete generic settings can also be applied, for example, to have all +mappings be stored, just set: + +[source,js] +-------------------------------------------------- +{ + "person" : { + "dynamic_templates" : [ + { + "store_generic" : { + "match" : "*", + "mapping" : { + "store" : true + } + } + } + ] + } +} +-------------------------------------------------- + +Such generic templates should be placed at the end of the +`dynamic_templates` list because when two or more dynamic templates +match a field, only the first matching one from the list is used. diff --git a/docs/reference/migration/migrate_1_0.asciidoc b/docs/reference/migration/migrate_1_0.asciidoc new file mode 100644 index 0000000..7fefd00 --- /dev/null +++ b/docs/reference/migration/migrate_1_0.asciidoc @@ -0,0 +1,376 @@ +[[breaking-changes]] += Breaking changes in 1.0 + +[partintro] +-- +This section discusses the changes that you need to be aware of when migrating +your application to Elasticsearch 1.0. +-- + +== System and settings + +* Elasticsearch now runs in the foreground by default. There is no more `-f` + flag on the command line. Instead, to run elasticsearch as a daemon, use + the `-d` flag: + +[source,sh] +--------------- +./bin/elasticsearch -d +--------------- + +* Command line settings can now be passed without the `-Des.` prefix, for + instance: + +[source,sh] +--------------- +./bin/elasticsearch --node.name=search_1 --cluster.name=production +--------------- + +* Elasticsearch on 64 bit Linux now uses <<mmapfs,`mmapfs`>> by default. Make + sure that you set <<setup-service,`MAX_MAP_COUNT`>> to a sufficiently high + number. The RPM and Debian packages default this value to `262144`. + +* The RPM and Debian packages no longer start Elasticsearch by default. + +* The `cluster.routing.allocation` settings (`disable_allocation`, + `disable_new_allocation` and `disable_replica_location`) have been + <<modules-cluster,replaced by the single setting>>: ++ +[source,yaml] +--------------- +cluster.routing.allocation.enable: all|primaries|new_primaries|none +--------------- + +== Stats and Info APIs + +The <<cluster-state,`cluster_state`>>, <<cluster-nodes-info,`nodes_info`>>, +<<cluster-nodes-stats,`nodes_stats`>> and <<indices-stats,`indices_stats`>> +APIs have all been changed to make their format more RESTful and less clumsy. + +For instance, if you just want the `nodes` section of the the `cluster_state`, +instead of: + +[source,sh] +--------------- +GET /_cluster/state?filter_metadata&filter_routing_table&filter_blocks +--------------- + +you now use: + +[source,sh] +--------------- +GET /_cluster/state/nodes +--------------- + +Simliarly for the `nodes_stats` API, if you want the `transport` and `http` +metrics only, instead of: + +[source,sh] +--------------- +GET /_nodes/stats?clear&transport&http +--------------- + +you now use: + +[source,sh] +--------------- +GET /_nodes/stats/transport,http +--------------- + +See the links above for full details. + + +== Indices APIs + +The `mapping`, `alias`, `settings`, and `warmer` index APIs are all similar +but there are subtle differences in the order of the URL and the response +body. For instance, adding a mapping and a warmer look slightly different: + +[source,sh] +--------------- +PUT /{index}/{type}/_mapping +PUT /{index}/_warmer/{name} +--------------- + +These URLs have been unified as: + +[source,sh] +--------------- +PUT /{indices}/_mapping/{type} +PUT /{indices}/_alias/{name} +PUT /{indices}/_warmer/{name} + +GET /{indices}/_mapping/{types} +GET /{indices}/_alias/{names} +GET /{indices}/_settings/{names} +GET /{indices}/_warmer/{names} + +DELETE /{indices}/_mapping/{types} +DELETE /{indices}/_alias/{names} +DELETE /{indices}/_warmer/{names} +--------------- + +All of the `{indices}`, `{types}` and `{names}` parameters can be replaced by: + + * `_all`, `*` or blank (ie left out altogether), all of which mean ``all'' + * wildcards like `test*` + * comma-separated lists: `index_1,test_*` + +The only exception is `DELETE` which doesn't accept blank (missing) +parameters. If you want to delete something, you should be specific. + +Similarly, the return values for `GET` have been unified with the following +rules: + +* Only return values that exist. If you try to `GET` a mapping which doesn't + exist, then the result will be an empty object: `{}`. We no longer throw a + `404` if the requested mapping/warmer/alias/setting doesn't exist. + +* The response format always has the index name, then the section, then the + element name, for instance: ++ +[source,json] +--------------- +{ + "my_index": { + "mappings": { + "my_type": {...} + } + } +} +--------------- ++ +This is a breaking change for the `get_mapping` API. + +In the future we will also provide plural versions to allow putting multiple mappings etc in a single request. + +See <<indices-put-mapping,`put-mapping`>>, <<indices-get-mapping,`get- +mapping`>>, <<indices-get-field-mapping,`get-field-mapping`>>, +<<indices-delete-mapping,`delete-mapping`>>, +<<indices-update-settings,`update-settings`>>, <<indices-get-settings,`get-settings`>>, +<<indices-warmers,`warmers`>>, and <<indices-aliases,`aliases`>> for more details. + +== Index request + +Previously a document could be indexed as itself, or wrapped in an outer +object which specified the `type` name: + +[source,json] +--------------- +PUT /my_index/my_type/1 +{ + "my_type": { + ... doc fields ... + } +} +--------------- + +This led to some ambiguity when a document also included a field with the same +name as the `type`. We no longer accept the outer `type` wrapper, but this +behaviour can be reenabled on an index-by-index basis with the setting: +`index.mapping.allow_type_wrapper`. + +== Search requests + +While the `search` API takes a top-level `query` parameter, the +<<search-count,`count`>>, <<docs-delete-by-query,`delete-by-query`>> and +<<search-validate,`validate-query`>> requests expected the whole body to be a +query. These have been changed to all accept a top-level `query` parameter: + +[source,json] +--------------- +GET /_count +{ + "query": { + "match": { + "title": "Interesting stuff" + } + } +} +--------------- + +Also, the top-level `filter` parameter in search has been renamed to +<<search-request-post-filter,`post_filter`>>, to indicate that it should not +be used as the primary way to filter search results (use a +<<query-dsl-filtered-query,`filtered` query>> instead), but only to filter +results AFTER facets/aggregations have been calculated. + +This example counts the top colors in all matching docs, but only returns docs +with color `red`: + +[source,json] +--------------- +GET /_search +{ + "query": { + "match_all": {} + }, + "aggs": { + "colors": { + "terms": { "field": "color" } + } + }, + "post_filter": { + "term": { + "color": "red" + } + } +} +--------------- + +== Multi-fields + +Multi-fields are dead! Long live multi-fields! Well, the field type +`multi_field` has been removed. Instead, any of the core field types +(excluding `object` and `nested`) now accept a `fields` parameter. It's the +same thing, but nicer. Instead of: + +[source,json] +--------------- +"title": { + "type": "multi_field", + "fields": { + "title": { "type": "string" }, + "raw": { "type": "string", "index": "not_analyzed" } + } +} +--------------- + +you can now write: + +[source,json] +--------------- +"title": { + "type": "string", + "fields": { + "raw": { "type": "string", "index": "not_analyzed" } + } +} +--------------- + +Existing multi-fields will be upgraded to the new format automatically. + +Also, instead of having to use the arcane `path` and `index_name` parameters +in order to index multiple fields into a single ``custom +_all+ field'', you +can now use the <<copy-to,`copy_to` parameter>>. + +== Stopwords + +Previously, the <<analysis-standard-analyzer,`standard`>> and +<<analysis-pattern-analyzer,`pattern`>> analyzers used the list of English stopwords +by default, which caused some hard to debug indexing issues. Now they are set to +use the empty stopwords list (ie `_none_`) instead. + +== Dates without years + +When dates are specified without a year, for example: `Dec 15 10:00:00` they +are treated as dates in 2000 during indexing and range searches... except for +the upper included bound `lte` where they were treated as dates in 1970! Now, +all https://github.com/elasticsearch/elasticsearch/issues/4451[dates without years] +use `1970` as the default. + +== Parameters + +* Geo queries used to use `miles` as the default unit. And we + http://en.wikipedia.org/wiki/Mars_Climate_Orbiter[all know what + happened at NASA] because of that decision. The new default unit is + https://github.com/elasticsearch/elasticsearch/issues/4515[`meters`]. + +* For all queries that support _fuzziness_, the `min_similarity`, `fuzziness` + and `edit_distance` parameters have been unified as the single parameter + `fuzziness`. See <<fuzziness>> for details of accepted values. + +* The `ignore_missing` parameter has been replaced by the `expand_wildcards`, + `ignore_unavailable` and `allow_no_indices` parameters, all of which have + sensible defaults. See <<multi-index,the multi-index docs>> for more. + +* An index name (or pattern) is now required for destructive operations like + deleting indices: ++ +[source,sh] +--------------- +# v0.90 - delete all indices: +DELETE / + +# v1.0 - delete all indices: +DELETE /_all +DELETE /* +--------------- ++ +Setting `action.destructive_requires_name` to `true` provides further safety +by disabling wildcard expansion on destructive actions. + +== Return values + +* The `ok` return value has been removed from all response bodies as it added + no useful information. + +* The `found`, `not_found` and `exists` return values have been unified as + `found` on all relevant APIs. + +* Field values, in response to the <<search-request-fields,`fields`>> + parameter, are now always returned as arrays. A field could have single or + multiple values, which meant that sometimes they were returned as scalars + and sometimes as arrays. By always returning arrays, this simplifies user + code. The only exception to this rule is when `fields` is used to retrieve + metadata like the `routing` value, which are always singular. Metadata + fields are always returned as scalars. ++ +The `fields` parameter is intended to be used for retrieving stored fields, +rather than for fields extracted from the `_source`. That means that it can no +longer be used to return whole objects and it no longer accepts the +`_source.fieldname` format. For these you should use the +<<search-request-source-filtering,`_source`  `_source_include` and `_source_exclude`>> +parameters instead. + +* Settings, like `index.analysis.analyzer.default` are now returned as proper + nested JSON objects, which makes them easier to work with programatically: ++ +[source,json] +--------------- +{ + "index": { + "analysis": { + "analyzer": { + "default": xxx + } + } + } +} +--------------- ++ +You can choose to return them in flattened format by passing `?flat_settings` +in the query string. + +* The <<indices-analyze,`analyze`>> API no longer supports the text response + format, but does support JSON and YAML. + +== Deprecations + +* The `text` query has been removed. Use the + <<query-dsl-match-query,`match`>> query instead. + +* The `field` query has been removed. Use the + <<query-dsl-query-string-query,`query_string`>> query instead. + +* Per-document boosting with the <<mapping-boost-field,`_boost`>> field has + been removed. You can use the + <<function-score-instead-of-boost,`function_score`>> instead. + +* The `path` parameter in mappings has been deprecated. Use the + <<copy-to,`copy_to`>> parameter instead. + +* The `custom_score` and `custom_boost_score` is no longer supported. You can + use <<query-dsl-function-score-query,`function_score`>> instead. + +== Percolator + +The percolator has been redesigned and because of this the dedicated `_percolator` index is no longer used by the percolator, +but instead the percolator works with a dedicated `.percolator` type. Read the http://www.elasticsearch.org/blog/percolator-redesign-blog-post/[redesigned percolator] +blog post for the reasons why the percolator has been redesigned. + +Elasticsearch will *not* delete the `_percolator` index when upgrading, only the percolate api will not use the queries +stored in the `_percolator` index. In order to use the already stored queries, you can just re-index the queries from the +`_percolator` index into any index under the reserved `.percolator` type. The format in which the percolate queries +were stored has *not* been changed. So a simple script that does a scan search to retrieve all the percolator queries +and then does a bulk request into another index should be sufficient. diff --git a/docs/reference/modules.asciidoc b/docs/reference/modules.asciidoc new file mode 100644 index 0000000..7915036 --- /dev/null +++ b/docs/reference/modules.asciidoc @@ -0,0 +1,37 @@ +[[modules]] += Modules + +include::modules/cluster.asciidoc[] + +include::modules/discovery.asciidoc[] + +include::modules/gateway.asciidoc[] + +include::modules/http.asciidoc[] + +include::modules/indices.asciidoc[] + +include::modules/memcached.asciidoc[] + +include::modules/network.asciidoc[] + +include::modules/node.asciidoc[] + +include::modules/tribe.asciidoc[] + +include::modules/plugins.asciidoc[] + +include::modules/scripting.asciidoc[] + +include::modules/advanced-scripting.asciidoc[] + +include::modules/threadpool.asciidoc[] + +include::modules/thrift.asciidoc[] + +include::modules/transport.asciidoc[] + +include::modules/snapshots.asciidoc[] + + + diff --git a/docs/reference/modules/advanced-scripting.asciidoc b/docs/reference/modules/advanced-scripting.asciidoc new file mode 100644 index 0000000..d215661 --- /dev/null +++ b/docs/reference/modules/advanced-scripting.asciidoc @@ -0,0 +1,184 @@ +[[modules-advanced-scripting]] +== Text scoring in scripts + + +Text features, such as term or document frequency for a specific term can be accessed in scripts (see <<modules-scripting, scripting documentation>> ) with the `_index` variable. This can be useful if, for example, you want to implement your own scoring model using for example a script inside a <<query-dsl-function-score-query,function score query>>. +Statistics over the document collection are computed *per shard*, not per +index. + +[float] +=== Nomenclature: + + +[horizontal] +`df`:: + + document frequency. The number of documents a term appears in. Computed + per field. + + +`tf`:: + + term frequency. The number times a term appears in a field in one specific + document. + +`ttf`:: + + total term frequency. The number of times this term appears in all + documents, that is, the sum of `tf` over all documents. Computed per + field. + +`df` and `ttf` are computed per shard and therefore these numbers can vary +depending on the shard the current document resides in. + + +[float] +=== Shard statistics: + +`_index.numDocs()`:: + + Number of documents in shard. + +`_index.maxDoc()`:: + + Maximal document number in shard. + +`_index.numDeletedDocs()`:: + + Number of deleted documents in shard. + + +[float] +=== Field statistics: + +Field statistics can be accessed with a subscript operator like this: +`_index['FIELD']`. + + +`_index['FIELD'].docCount()`:: + + Number of documents containing the field `FIELD`. Does not take deleted documents into account. + +`_index['FIELD'].sumttf()`:: + + Sum of `ttf` over all terms that appear in field `FIELD` in all documents. + +`_index['FIELD'].sumdf()`:: + + The sum of `df` s over all terms that appear in field `FIELD` in all + documents. + + +Field statistics are computed per shard and therfore these numbers can vary +depending on the shard the current document resides in. +The number of terms in a field cannot be accessed using the `_index` variable. See <<mapping-core-types, word count mapping type>> on how to do that. + +[float] +=== Term statistics: + +Term statistics for a field can be accessed with a subscript operator like +this: `_index['FIELD']['TERM']`. This will never return null, even if term or field does not exist. +If you do not need the term frequency, call `_index['FIELD'].get('TERM', 0)` +to avoid uneccesary initialization of the frequencies. The flag will have only +affect is your set the `index_options` to `docs` (see <<mapping-core-types, mapping documentation>>). + + +`_index['FIELD']['TERM'].df()`:: + + `df` of term `TERM` in field `FIELD`. Will be returned, even if the term + is not present in the current document. + +`_index['FIELD']['TERM'].ttf()`:: + + The sum of term frequencys of term `TERM` in field `FIELD` over all + documents. Will be returned, even if the term is not present in the + current document. + +`_index['FIELD']['TERM'].tf()`:: + + `tf` of term `TERM` in field `FIELD`. Will be 0 if the term is not present + in the current document. + + +[float] +=== Term positions, offsets and payloads: + +If you need information on the positions of terms in a field, call +`_index['FIELD'].get('TERM', flag)` where flag can be + +[horizontal] +`_POSITIONS`:: if you need the positions of the term +`_OFFSETS`:: if you need the offests of the term +`_PAYLOADS`:: if you need the payloads of the term +`_CACHE`:: if you need to iterate over all positions several times + +The iterator uses the underlying lucene classes to iterate over positions. For efficiency reasons, you can only iterate over positions once. If you need to iterate over the positions several times, set the `_CACHE` flag. + +You can combine the operators with a `|` if you need more than one info. For +example, the following will return an object holding the positions and payloads, +as well as all statistics: + + + `_index['FIELD'].get('TERM', _POSITIONS | _PAYLOADS)` + + +Positions can be accessed with an iterator that returns an object +(`POS_OBJECT`) holding position, offsets and payload for each term position. + +`POS_OBJECT.position`:: + + The position of the term. + +`POS_OBJECT.startOffset`:: + + The start offset of the term. + +`POS_OBJECT.endOffset`:: + + The end offset of the term. + +`POS_OBJECT.payload`:: + + The payload of the term. + +`POS_OBJECT.payloadAsInt(missingValue)`:: + + The payload of the term converted to integer. If the current position has + no payload, the `missingValue` will be returned. Call this only if you + know that your payloads are integers. + +`POS_OBJECT.payloadAsFloat(missingValue)`:: + + The payload of the term converted to float. If the current position has no + payload, the `missingValue` will be returned. Call this only if you know + that your payloads are floats. + +`POS_OBJECT.payloadAsString()`:: + + The payload of the term converted to string. If the current position has + no payload, `null` will be returned. Call this only if you know that your + payloads are strings. + + +Example: sums up all payloads for the term `foo`. + +[source,mvel] +--------------------------------------------------------- +termInfo = _index['my_field'].get('foo',_PAYLOADS); +score = 0; +for (pos : termInfo) { + score = score + pos.payloadAsInt(0); +} +return score; +--------------------------------------------------------- + + +[float] +=== Term vectors: + +The `_index` variable can only be used to gather statistics for single terms. If you want to use information on all terms in a field, you must store the term vectors (set `term_vector` in the mapping as described in the <<mapping-core-types,mapping documentation>>). To access them, call +`_index.getTermVectors()` to get a +https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/index/Fields.html[Fields] +instance. This object can then be used as described in https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/index/Fields.html[lucene doc] to iterate over fields and then for each field iterate over each term in the field. +The method will return null if the term vectors were not stored. + diff --git a/docs/reference/modules/cluster.asciidoc b/docs/reference/modules/cluster.asciidoc new file mode 100644 index 0000000..e61fbf6 --- /dev/null +++ b/docs/reference/modules/cluster.asciidoc @@ -0,0 +1,239 @@ +[[modules-cluster]] +== Cluster + +[float] +[[shards-allocation]] +=== Shards Allocation + +Shards allocation is the process of allocating shards to nodes. This can +happen during initial recovery, replica allocation, rebalancing, or +handling nodes being added or removed. + +The following settings may be used: + +`cluster.routing.allocation.allow_rebalance`:: + Allow to control when rebalancing will happen based on the total + state of all the indices shards in the cluster. `always`, + `indices_primaries_active`, and `indices_all_active` are allowed, + defaulting to `indices_all_active` to reduce chatter during + initial recovery. + + +`cluster.routing.allocation.cluster_concurrent_rebalance`:: + Allow to control how many concurrent rebalancing of shards are + allowed cluster wide, and default it to `2`. + + +`cluster.routing.allocation.node_initial_primaries_recoveries`:: + Allow to control specifically the number of initial recoveries + of primaries that are allowed per node. Since most times local + gateway is used, those should be fast and we can handle more of + those per node without creating load. + + +`cluster.routing.allocation.node_concurrent_recoveries`:: + How many concurrent recoveries are allowed to happen on a node. + Defaults to `2`. + +`cluster.routing.allocation.enable`:: + Controls shard allocation for all indices, by allowing specific + kinds of shard to be allocated. + added[1.0.0.RC1,Replaces `cluster.routing.allocation.disable*`] + Can be set to: + * `all` (default) - Allows shard allocation for all kinds of shards. + * `primaries` - Allows shard allocation only for primary shards. + * `new_primaries` - Allows shard allocation only for primary shards for new indices. + * `none` - No shard allocations of any kind are allowed for all indices. + +`cluster.routing.allocation.disable_new_allocation`:: + deprecated[1.0.0.RC1,Replaced by `cluster.routing.allocation.enable`] + +`cluster.routing.allocation.disable_allocation`:: + deprecated[1.0.0.RC1,Replaced by `cluster.routing.allocation.enable`] + + +`cluster.routing.allocation.disable_replica_allocation`:: + deprecated[1.0.0.RC1,Replaced by `cluster.routing.allocation.enable`] + +`cluster.routing.allocation.same_shard.host`:: + Allows to perform a check to prevent allocation of multiple instances + of the same shard on a single host, based on host name and host address. + Defaults to `false`, meaning that no check is performed by default. This + setting only applies if multiple nodes are started on the same machine. + +`indices.recovery.concurrent_streams`:: + The number of streams to open (on a *node* level) to recover a + shard from a peer shard. Defaults to `3`. + +[float] +[[allocation-awareness]] +=== Shard Allocation Awareness + +Cluster allocation awareness allows to configure shard and replicas +allocation across generic attributes associated the nodes. Lets explain +it through an example: + +Assume we have several racks. When we start a node, we can configure an +attribute called `rack_id` (any attribute name works), for example, here +is a sample config: + +---------------------- +node.rack_id: rack_one +---------------------- + +The above sets an attribute called `rack_id` for the relevant node with +a value of `rack_one`. Now, we need to configure the `rack_id` attribute +as one of the awareness allocation attributes (set it on *all* (master +eligible) nodes config): + +-------------------------------------------------------- +cluster.routing.allocation.awareness.attributes: rack_id +-------------------------------------------------------- + +The above will mean that the `rack_id` attribute will be used to do +awareness based allocation of shard and its replicas. For example, lets +say we start 2 nodes with `node.rack_id` set to `rack_one`, and deploy a +single index with 5 shards and 1 replica. The index will be fully +deployed on the current nodes (5 shards and 1 replica each, total of 10 +shards). + +Now, if we start two more nodes, with `node.rack_id` set to `rack_two`, +shards will relocate to even the number of shards across the nodes, but, +a shard and its replica will not be allocated in the same `rack_id` +value. + +The awareness attributes can hold several values, for example: + +------------------------------------------------------------- +cluster.routing.allocation.awareness.attributes: rack_id,zone +------------------------------------------------------------- + +*NOTE*: When using awareness attributes, shards will not be allocated to +nodes that don't have values set for those attributes. + +[float] +[[forced-awareness]] +=== Forced Awareness + +Sometimes, we know in advance the number of values an awareness +attribute can have, and more over, we would like never to have more +replicas then needed allocated on a specific group of nodes with the +same awareness attribute value. For that, we can force awareness on +specific attributes. + +For example, lets say we have an awareness attribute called `zone`, and +we know we are going to have two zones, `zone1` and `zone2`. Here is how +we can force awareness one a node: + +[source,js] +------------------------------------------------------------------- +cluster.routing.allocation.awareness.force.zone.values: zone1,zone2 +cluster.routing.allocation.awareness.attributes: zone +------------------------------------------------------------------- + +Now, lets say we start 2 nodes with `node.zone` set to `zone1` and +create an index with 5 shards and 1 replica. The index will be created, +but only 5 shards will be allocated (with no replicas). Only when we +start more shards with `node.zone` set to `zone2` will the replicas be +allocated. + +[float] +==== Automatic Preference When Searching / GETing + +When executing a search, or doing a get, the node receiving the request +will prefer to execute the request on shards that exists on nodes that +have the same attribute values as the executing node. + +[float] +==== Realtime Settings Update + +The settings can be updated using the <<cluster-update-settings,cluster update settings API>> on a live cluster. + +[float] +[[allocation-filtering]] +=== Shard Allocation Filtering + +Allow to control allocation if indices on nodes based on include/exclude +filters. The filters can be set both on the index level and on the +cluster level. Lets start with an example of setting it on the cluster +level: + +Lets say we have 4 nodes, each has specific attribute called `tag` +associated with it (the name of the attribute can be any name). Each +node has a specific value associated with `tag`. Node 1 has a setting +`node.tag: value1`, Node 2 a setting of `node.tag: value2`, and so on. + +We can create an index that will only deploy on nodes that have `tag` +set to `value1` and `value2` by setting +`index.routing.allocation.include.tag` to `value1,value2`. For example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index.routing.allocation.include.tag" : "value1,value2" +}' +-------------------------------------------------- + +On the other hand, we can create an index that will be deployed on all +nodes except for nodes with a `tag` of value `value3` by setting +`index.routing.allocation.exclude.tag` to `value3`. For example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index.routing.allocation.exclude.tag" : "value3" +}' +-------------------------------------------------- + +`index.routing.allocation.require.*` can be used to +specify a number of rules, all of which MUST match in order for a shard +to be allocated to a node. This is in contrast to `include` which will +include a node if ANY rule matches. + +The `include`, `exclude` and `require` values can have generic simple +matching wildcards, for example, `value1*`. A special attribute name +called `_ip` can be used to match on node ip values. In addition `_host` +attribute can be used to match on either the node's hostname or its ip +address. Similarly `_name` and `_id` attributes can be used to match on +node name and node id accordingly. + +Obviously a node can have several attributes associated with it, and +both the attribute name and value are controlled in the setting. For +example, here is a sample of several node configurations: + +[source,js] +-------------------------------------------------- +node.group1: group1_value1 +node.group2: group2_value4 +-------------------------------------------------- + +In the same manner, `include`, `exclude` and `require` can work against +several attributes, for example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/test/_settings -d '{ + "index.routing.allocation.include.group1" : "xxx" + "index.routing.allocation.include.group2" : "yyy", + "index.routing.allocation.exclude.group3" : "zzz", + "index.routing.allocation.require.group4" : "aaa" +}' +-------------------------------------------------- + +The provided settings can also be updated in real time using the update +settings API, allowing to "move" indices (shards) around in realtime. + +Cluster wide filtering can also be defined, and be updated in real time +using the cluster update settings API. This setting can come in handy +for things like decommissioning nodes (even if the replica count is set +to 0). Here is a sample of how to decommission a node based on `_ip` +address: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/_cluster/settings -d '{ + "transient" : { + "cluster.routing.allocation.exclude._ip" : "10.0.0.1" + } +}' +-------------------------------------------------- diff --git a/docs/reference/modules/discovery.asciidoc b/docs/reference/modules/discovery.asciidoc new file mode 100644 index 0000000..292748d --- /dev/null +++ b/docs/reference/modules/discovery.asciidoc @@ -0,0 +1,30 @@ +[[modules-discovery]] +== Discovery + +The discovery module is responsible for discovering nodes within a +cluster, as well as electing a master node. + +Note, Elasticsearch is a peer to peer based system, nodes communicate +with one another directly if operations are delegated / broadcast. All +the main APIs (index, delete, search) do not communicate with the master +node. The responsibility of the master node is to maintain the global +cluster state, and act if nodes join or leave the cluster by reassigning +shards. Each time a cluster state is changed, the state is made known to +the other nodes in the cluster (the manner depends on the actual +discovery implementation). + +[float] +=== Settings + +The `cluster.name` allows to create separated clusters from one another. +The default value for the cluster name is `elasticsearch`, though it is +recommended to change this to reflect the logical group name of the +cluster running. + +include::discovery/azure.asciidoc[] + +include::discovery/ec2.asciidoc[] + +include::discovery/gce.asciidoc[] + +include::discovery/zen.asciidoc[] diff --git a/docs/reference/modules/discovery/azure.asciidoc b/docs/reference/modules/discovery/azure.asciidoc new file mode 100644 index 0000000..bb6fdc8 --- /dev/null +++ b/docs/reference/modules/discovery/azure.asciidoc @@ -0,0 +1,6 @@ +[[modules-discovery-azure]] +=== Azure Discovery + +Azure discovery allows to use the Azure APIs to perform automatic discovery (similar to multicast). +Please check the https://github.com/elasticsearch/elasticsearch-cloud-azure[plugin website] +to find the full documentation. diff --git a/docs/reference/modules/discovery/ec2.asciidoc b/docs/reference/modules/discovery/ec2.asciidoc new file mode 100644 index 0000000..9d0fa3f --- /dev/null +++ b/docs/reference/modules/discovery/ec2.asciidoc @@ -0,0 +1,6 @@ +[[modules-discovery-ec2]] +=== EC2 Discovery + +EC2 discovery allows to use the EC2 APIs to perform automatic discovery (similar to multicast). +Please check the https://github.com/elasticsearch/elasticsearch-cloud-aws[plugin website] +to find the full documentation. diff --git a/docs/reference/modules/discovery/gce.asciidoc b/docs/reference/modules/discovery/gce.asciidoc new file mode 100644 index 0000000..bb9c89f --- /dev/null +++ b/docs/reference/modules/discovery/gce.asciidoc @@ -0,0 +1,6 @@ +[[modules-discovery-gce]] +=== Google Compute Engine Discovery + +Google Compute Engine (GCE) discovery allows to use the GCE APIs to perform automatic discovery (similar to multicast). +Please check the https://github.com/elasticsearch/elasticsearch-cloud-gce[plugin website] +to find the full documentation. diff --git a/docs/reference/modules/discovery/zen.asciidoc b/docs/reference/modules/discovery/zen.asciidoc new file mode 100644 index 0000000..64281d9 --- /dev/null +++ b/docs/reference/modules/discovery/zen.asciidoc @@ -0,0 +1,161 @@ +[[modules-discovery-zen]] +=== Zen Discovery + +The zen discovery is the built in discovery module for elasticsearch and +the default. It provides both multicast and unicast discovery as well +being easily extended to support cloud environments. + +The zen discovery is integrated with other modules, for example, all +communication between nodes is done using the +<<modules-transport,transport>> module. + +It is separated into several sub modules, which are explained below: + +[float] +[[ping]] +==== Ping + +This is the process where a node uses the discovery mechanisms to find +other nodes. There is support for both multicast and unicast based +discovery (can be used in conjunction as well). + +[float] +[[multicast]] +===== Multicast + +Multicast ping discovery of other nodes is done by sending one or more +multicast requests where existing nodes that exists will receive and +respond to. It provides the following settings with the +`discovery.zen.ping.multicast` prefix: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`group` |The group address to use. Defaults to `224.2.2.4`. + +|`port` |The port to use. Defaults to `54328`. + +|`ttl` |The ttl of the multicast message. Defaults to `3`. + +|`address` |The address to bind to, defaults to `null` which means it +will bind to all available network interfaces. + +|`enabled` |Whether multicast ping discovery is enabled. Defaults to `true`. +|======================================================================= + +[float] +[[unicast]] +===== Unicast + +The unicast discovery allows to perform the discovery when multicast is +not enabled. It basically requires a list of hosts to use that will act +as gossip routers. It provides the following settings with the +`discovery.zen.ping.unicast` prefix: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`hosts` |Either an array setting or a comma delimited setting. Each +value is either in the form of `host:port`, or in the form of +`host[port1-port2]`. +|======================================================================= + +The unicast discovery uses the +<<modules-transport,transport>> module to +perform the discovery. + +[float] +[[master-election]] +==== Master Election + +As part of the initial ping process a master of the cluster is either +elected or joined to. This is done automatically. The +`discovery.zen.ping_timeout` (which defaults to `3s`) allows to +configure the election to handle cases of slow or congested networks +(higher values assure less chance of failure). + +Nodes can be excluded from becoming a master by setting `node.master` to +`false`. Note, once a node is a client node (`node.client` set to +`true`), it will not be allowed to become a master (`node.master` is +automatically set to `false`). + +The `discovery.zen.minimum_master_nodes` allows to control the minimum +number of master eligible nodes a node should "see" in order to operate +within the cluster. Its recommended to set it to a higher value than 1 +when running more than 2 nodes in the cluster. + +[float] +[[fault-detection]] +==== Fault Detection + +There are two fault detection processes running. The first is by the +master, to ping all the other nodes in the cluster and verify that they +are alive. And on the other end, each node pings to master to verify if +its still alive or an election process needs to be initiated. + +The following settings control the fault detection process using the +`discovery.zen.fd` prefix: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`ping_interval` |How often a node gets pinged. Defaults to `1s`. + +|`ping_timeout` |How long to wait for a ping response, defaults to +`30s`. + +|`ping_retries` |How many ping failures / timeouts cause a node to be +considered failed. Defaults to `3`. +|======================================================================= + +[float] +==== External Multicast + +The multicast discovery also supports external multicast requests to +discover nodes. The external client can send a request to the multicast +IP/group and port, in the form of: + +[source,js] +-------------------------------------------------- +{ + "request" : { + "cluster_name": "test_cluster" + } +} +-------------------------------------------------- + +And the response will be similar to node info response (with node level +information only, including transport/http addresses, and node +attributes): + +[source,js] +-------------------------------------------------- +{ + "response" : { + "cluster_name" : "test_cluster", + "transport_address" : "...", + "http_address" : "...", + "attributes" : { + "..." + } + } +} +-------------------------------------------------- + +Note, it can still be enabled, with disabled internal multicast +discovery, but still have external discovery working by keeping +`discovery.zen.ping.multicast.enabled` set to `true` (the default), but, +setting `discovery.zen.ping.multicast.ping.enabled` to `false`. + +[float] +==== Cluster state updates + +The master node is the only node in a cluster that can make changes to the +cluster state. The master node processes one cluster state update at a time, +applies the required changes and publishes the updated cluster state to all +the other nodes in the cluster. Each node receives the publish message, +updates its own cluster state and replies to the master node, which waits for +all nodes to respond, up to a timeout, before going ahead processing the next +updates in the queue. The `discovery.zen.publish_timeout` is set by default +to 30 seconds and can be changed dynamically through the +<<cluster-update-settings,cluster update settings api>>. diff --git a/docs/reference/modules/gateway.asciidoc b/docs/reference/modules/gateway.asciidoc new file mode 100644 index 0000000..539a57d --- /dev/null +++ b/docs/reference/modules/gateway.asciidoc @@ -0,0 +1,75 @@ +[[modules-gateway]] +== Gateway + +The gateway module allows one to store the state of the cluster meta +data across full cluster restarts. The cluster meta data mainly holds +all the indices created with their respective (index level) settings and +explicit type mappings. + +Each time the cluster meta data changes (for example, when an index is +added or deleted), those changes will be persisted using the gateway. +When the cluster first starts up, the state will be read from the +gateway and applied. + +The gateway set on the node level will automatically control the index +gateway that will be used. For example, if the `fs` gateway is used, +then automatically, each index created on the node will also use its own +respective index level `fs` gateway. In this case, if an index should +not persist its state, it should be explicitly set to `none` (which is +the only other value it can be set to). + +The default gateway used is the +<<modules-gateway-local,local>> gateway. + +[float] +[[recover-after]] +=== Recovery After Nodes / Time + +In many cases, the actual cluster meta data should only be recovered +after specific nodes have started in the cluster, or a timeout has +passed. This is handy when restarting the cluster, and each node local +index storage still exists to be reused and not recovered from the +gateway (which reduces the time it takes to recover from the gateway). + +The `gateway.recover_after_nodes` setting (which accepts a number) +controls after how many data and master eligible nodes within the +cluster recovery will start. The `gateway.recover_after_data_nodes` and +`gateway.recover_after_master_nodes` setting work in a similar fashion, +except they consider only the number of data nodes and only the number +of master nodes respectively. The `gateway.recover_after_time` setting +(which accepts a time value) sets the time to wait till recovery happens +once all `gateway.recover_after...nodes` conditions are met. + +The `gateway.expected_nodes` allows to set how many data and master +eligible nodes are expected to be in the cluster, and once met, the +`recover_after_time` is ignored and recovery starts. The +`gateway.expected_data_nodes` and `gateway.expected_master_nodes` +settings are also supported. For example setting: + +[source,js] +-------------------------------------------------- +gateway: + recover_after_nodes: 1 + recover_after_time: 5m + expected_nodes: 2 +-------------------------------------------------- + +In an expected 2 nodes cluster will cause recovery to start 5 minutes +after the first node is up, but once there are 2 nodes in the cluster, +recovery will begin immediately (without waiting). + +Note, once the meta data has been recovered from the gateway (which +indices to create, mappings and so on), then this setting is no longer +effective until the next full restart of the cluster. + +Operations are blocked while the cluster meta data has not been +recovered in order not to mix with the actual cluster meta data that +will be recovered once the settings has been reached. + +include::gateway/local.asciidoc[] + +include::gateway/fs.asciidoc[] + +include::gateway/hadoop.asciidoc[] + +include::gateway/s3.asciidoc[] diff --git a/docs/reference/modules/gateway/fs.asciidoc b/docs/reference/modules/gateway/fs.asciidoc new file mode 100644 index 0000000..8d765d3 --- /dev/null +++ b/docs/reference/modules/gateway/fs.asciidoc @@ -0,0 +1,39 @@ +[[modules-gateway-fs]] +=== Shared FS Gateway + +*The shared FS gateway is deprecated and will be removed in a future +version. Please use the +<<modules-gateway-local,local gateway>> +instead.* + +The file system based gateway stores the cluster meta data and indices +in a *shared* file system. Note, since it is a distributed system, the +file system should be shared between all different nodes. Here is an +example config to enable it: + +[source,js] +-------------------------------------------------- +gateway: + type: fs +-------------------------------------------------- + +[float] +==== location + +The location where the gateway stores the cluster state can be set using +the `gateway.fs.location` setting. By default, it will be stored under +the `work` directory. Note, the `work` directory is considered a +temporal directory with Elasticsearch (meaning it is safe to `rm -rf` +it), the default location of the persistent gateway in work intentional, +*it should be changed*. + +When explicitly specifying the `gateway.fs.location`, each node will +append its `cluster.name` to the provided location. It means that the +location provided can safely support several clusters. + +[float] +==== concurrent_streams + +The `gateway.fs.concurrent_streams` allow to throttle the number of +streams (per node) opened against the shared gateway performing the +snapshot operation. It defaults to `5`. diff --git a/docs/reference/modules/gateway/hadoop.asciidoc b/docs/reference/modules/gateway/hadoop.asciidoc new file mode 100644 index 0000000..b55a4be --- /dev/null +++ b/docs/reference/modules/gateway/hadoop.asciidoc @@ -0,0 +1,36 @@ +[[modules-gateway-hadoop]] +=== Hadoop Gateway + +*The hadoop gateway is deprecated and will be removed in a future +version. Please use the +<<modules-gateway-local,local gateway>> +instead.* + +The hadoop (HDFS) based gateway stores the cluster meta and indices data +in hadoop. Hadoop support is provided as a plugin and installing is +explained https://github.com/elasticsearch/elasticsearch-hadoop[here] or +downloading the hadoop plugin and placing it under the `plugins` +directory. Here is an example config to enable it: + +[source,js] +-------------------------------------------------- +gateway: + type: hdfs + hdfs: + uri: hdfs://myhost:8022 +-------------------------------------------------- + +[float] +==== Settings + +The hadoop gateway requires two simple settings. The `gateway.hdfs.uri` +controls the URI to connect to the hadoop cluster, for example: +`hdfs://myhost:8022`. The `gateway.hdfs.path` controls the path under +which the gateway will store the data. + +[float] +==== concurrent_streams + +The `gateway.hdfs.concurrent_streams` allow to throttle the number of +streams (per node) opened against the shared gateway performing the +snapshot operation. It defaults to `5`. diff --git a/docs/reference/modules/gateway/local.asciidoc b/docs/reference/modules/gateway/local.asciidoc new file mode 100644 index 0000000..eb4c4f3 --- /dev/null +++ b/docs/reference/modules/gateway/local.asciidoc @@ -0,0 +1,57 @@ +[[modules-gateway-local]] +=== Local Gateway + +The local gateway allows for recovery of the full cluster state and +indices from the local storage of each node, and does not require a +common node level shared storage. + +Note, different from shared gateway types, the persistency to the local +gateway is *not* done in an async manner. Once an operation is +performed, the data is there for the local gateway to recover it in case +of full cluster failure. + +It is important to configure the `gateway.recover_after_nodes` setting +to include most of the expected nodes to be started after a full cluster +restart. This will insure that the latest cluster state is recovered. +For example: + +[source,js] +-------------------------------------------------- +gateway: + recover_after_nodes: 1 + recover_after_time: 5m + expected_nodes: 2 +-------------------------------------------------- + +[float] +==== Dangling indices + +When a node joins the cluster, any shards/indices stored in its local `data/` +directory which do not already exist in the cluster will be imported into the +cluster by default. This functionality has two purposes: + +1. If a new master node is started which is unaware of the other indices in + the cluster, adding the old nodes will cause the old indices to be + imported, instead of being deleted. + +2. An old index can be added to an existing cluster by copying it to the + `data/` directory of a new node, starting the node and letting it join + the cluster. Once the index has been replicated to other nodes in the + cluster, the new node can be shut down and removed. + +The import of dangling indices can be controlled with the +`gateway.local.auto_import_dangled` which accepts: + +[horizontal] +`yes`:: + + Import dangling indices into the cluster (default). + +`close`:: + + Import dangling indices into the cluster state, but leave them closed. + +`no`:: + + Delete dangling indices after `gateway.local.dangling_timeout`, which + defaults to 2 hours. diff --git a/docs/reference/modules/gateway/s3.asciidoc b/docs/reference/modules/gateway/s3.asciidoc new file mode 100644 index 0000000..8f2f5d9 --- /dev/null +++ b/docs/reference/modules/gateway/s3.asciidoc @@ -0,0 +1,51 @@ +[[modules-gateway-s3]] +=== S3 Gateway + +*The S3 gateway is deprecated and will be removed in a future version. +Please use the <<modules-gateway-local,local +gateway>> instead.* + +S3 based gateway allows to do long term reliable async persistency of +the cluster state and indices directly to Amazon S3. Here is how it can +be configured: + +[source,js] +-------------------------------------------------- +cloud: + aws: + access_key: AKVAIQBF2RECL7FJWGJQ + secret_key: vExyMThREXeRMm/b/LRzEB8jWwvzQeXgjqMX+6br + + +gateway: + type: s3 + s3: + bucket: bucket_name +-------------------------------------------------- + +You’ll need to install the `cloud-aws` plugin, by running +`bin/plugin install cloud-aws` before (re)starting elasticsearch. + +The following are a list of settings (prefixed with `gateway.s3`) that +can further control the S3 gateway: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`chunk_size` |Big files are broken down into chunks (to overcome AWS 5g +limit and use concurrent snapshotting). Default set to `100m`. +|======================================================================= + +[float] +==== concurrent_streams + +The `gateway.s3.concurrent_streams` allow to throttle the number of +streams (per node) opened against the shared gateway performing the +snapshot operation. It defaults to `5`. + +[float] +==== Region + +The `cloud.aws.region` can be set to a region and will automatically use +the relevant settings for both `ec2` and `s3`. The available values are: +`us-east-1`, `us-west-1`, `ap-southeast-1`, `eu-west-1`. diff --git a/docs/reference/modules/http.asciidoc b/docs/reference/modules/http.asciidoc new file mode 100644 index 0000000..fbc153b --- /dev/null +++ b/docs/reference/modules/http.asciidoc @@ -0,0 +1,51 @@ +[[modules-http]] +== HTTP + +The http module allows to expose *elasticsearch* APIs +over HTTP. + +The http mechanism is completely asynchronous in nature, meaning that +there is no blocking thread waiting for a response. The benefit of using +asynchronous communication for HTTP is solving the +http://en.wikipedia.org/wiki/C10k_problem[C10k problem]. + +When possible, consider using +http://en.wikipedia.org/wiki/Keepalive#HTTP_Keepalive[HTTP keep alive] +when connecting for better performance and try to get your favorite +client not to do +http://en.wikipedia.org/wiki/Chunked_transfer_encoding[HTTP chunking]. + +[float] +=== Settings + +The following are the settings the can be configured for HTTP: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`http.port` |A bind port range. Defaults to `9200-9300`. + +|`http.max_content_length` |The max content of an HTTP request. Defaults +to `100mb` + +|`http.max_initial_line_length` |The max length of an HTTP URL. Defaults +to `4kb` + +|`http.compression` |Support for compression when possible (with +Accept-Encoding). Defaults to `false`. + +|`http.compression_level` |Defines the compression level to use. +Defaults to `6`. +|======================================================================= + +It also shares the uses the common +<<modules-network,network settings>>. + +[float] +=== Disable HTTP + +The http module can be completely disabled and not started by setting +`http.enabled` to `false`. This make sense when creating non +<<modules-node,data nodes>> which accept HTTP +requests, and communicate with data nodes using the internal +<<modules-transport,transport>>. diff --git a/docs/reference/modules/indices.asciidoc b/docs/reference/modules/indices.asciidoc new file mode 100644 index 0000000..75fd8f5 --- /dev/null +++ b/docs/reference/modules/indices.asciidoc @@ -0,0 +1,76 @@ +[[modules-indices]] +== Indices + +The indices module allow to control settings that are globally managed +for all indices. + +[float] +[[buffer]] +=== Indexing Buffer + +The indexing buffer setting allows to control how much memory will be +allocated for the indexing process. It is a global setting that bubbles +down to all the different shards allocated on a specific node. + +The `indices.memory.index_buffer_size` accepts either a percentage or a +byte size value. It defaults to `10%`, meaning that `10%` of the total +memory allocated to a node will be used as the indexing buffer size. +This amount is then divided between all the different shards. Also, if +percentage is used, allow to set `min_index_buffer_size` (defaults to +`48mb`) and `max_index_buffer_size` which by default is unbounded. + +The `indices.memory.min_shard_index_buffer_size` allows to set a hard +lower limit for the memory allocated per shard for its own indexing +buffer. It defaults to `4mb`. + +[float] +[[indices-ttl]] +=== TTL interval + +You can dynamically set the `indices.ttl.interval` allows to set how +often expired documents will be automatically deleted. The default value +is 60s. + +The deletion orders are processed by bulk. You can set +`indices.ttl.bulk_size` to fit your needs. The default value is 10000. + +See also <<mapping-ttl-field>>. + +[float] +[[recovery]] +=== Recovery + +The following settings can be set to manage recovery policy: + +[horizontal] +`indices.recovery.concurrent_streams`:: + defaults to `3`. + +`indices.recovery.file_chunk_size`:: + defaults to `512kb`. + +`indices.recovery.translog_ops`:: + defaults to `1000`. + +`indices.recovery.translog_size`:: + defaults to `512kb`. + +`indices.recovery.compress`:: + defaults to `true`. + +`indices.recovery.max_bytes_per_sec`:: + defaults to `20mb`. + +[float] +[[throttling]] +=== Store level throttling + +The following settings can be set to control store throttling: + +[horizontal] +`indices.store.throttle.type`:: + could be `merge` (default), `not` or `all`. See <<index-modules-store>>. + +`indices.store.throttle.max_bytes_per_sec`:: + defaults to `20mb`. + diff --git a/docs/reference/modules/memcached.asciidoc b/docs/reference/modules/memcached.asciidoc new file mode 100644 index 0000000..20276d0 --- /dev/null +++ b/docs/reference/modules/memcached.asciidoc @@ -0,0 +1,69 @@ +[[modules-memcached]] +== memcached + +The memcached module allows to expose *elasticsearch* +APIs over the memcached protocol (as closely +as possible). + +It is provided as a plugin called `transport-memcached` and installing +is explained +https://github.com/elasticsearch/elasticsearch-transport-memcached[here] +. Another option is to download the memcached plugin and placing it +under the `plugins` directory. + +The memcached protocol supports both the binary and the text protocol, +automatically detecting the correct one to use. + +[float] +=== Mapping REST to Memcached Protocol + +Memcached commands are mapped to REST and handled by the same generic +REST layer in elasticsearch. Here is a list of the memcached commands +supported: + +[float] +==== GET + +The memcached `GET` command maps to a REST `GET`. The key used is the +URI (with parameters). The main downside is the fact that the memcached +`GET` does not allow body in the request (and `SET` does not allow to +return a result...). For this reason, most REST APIs (like search) allow +to accept the "source" as a URI parameter as well. + +[float] +==== SET + +The memcached `SET` command maps to a REST `POST`. The key used is the +URI (with parameters), and the body maps to the REST body. + +[float] +==== DELETE + +The memcached `DELETE` command maps to a REST `DELETE`. The key used is +the URI (with parameters). + +[float] +==== QUIT + +The memcached `QUIT` command is supported and disconnects the client. + +[float] +=== Settings + +The following are the settings the can be configured for memcached: + +[cols="<,<",options="header",] +|=============================================================== +|Setting |Description +|`memcached.port` |A bind port range. Defaults to `11211-11311`. +|=============================================================== + +It also shares the uses the common +<<modules-network,network settings>>. + +[float] +=== Disable memcached + +The memcached module can be completely disabled and not started using by +setting `memcached.enabled` to `false`. By default it is enabled once it +is detected as a plugin. diff --git a/docs/reference/modules/network.asciidoc b/docs/reference/modules/network.asciidoc new file mode 100644 index 0000000..835b6e4 --- /dev/null +++ b/docs/reference/modules/network.asciidoc @@ -0,0 +1,89 @@ +[[modules-network]] +== Network Settings + +There are several modules within a Node that use network based +configuration, for example, the +<<modules-transport,transport>> and +<<modules-http,http>> modules. Node level +network settings allows to set common settings that will be shared among +all network based modules (unless explicitly overridden in each module). + +The `network.bind_host` setting allows to control the host different +network components will bind on. By default, the bind host will be +`anyLocalAddress` (typically `0.0.0.0` or `::0`). + +The `network.publish_host` setting allows to control the host the node +will publish itself within the cluster so other nodes will be able to +connect to it. Of course, this can't be the `anyLocalAddress`, and by +default, it will be the first non loopback address (if possible), or the +local address. + +The `network.host` setting is a simple setting to automatically set both +`network.bind_host` and `network.publish_host` to the same host value. + +Both settings allows to be configured with either explicit host address +or host name. The settings also accept logical setting values explained +in the following table: + +[cols="<,<",options="header",] +|======================================================================= +|Logical Host Setting Value |Description +|`_local_` |Will be resolved to the local ip address. + +|`_non_loopback_` |The first non loopback address. + +|`_non_loopback:ipv4_` |The first non loopback IPv4 address. + +|`_non_loopback:ipv6_` |The first non loopback IPv6 address. + +|`_[networkInterface]_` |Resolves to the ip address of the provided +network interface. For example `_en0_`. + +|`_[networkInterface]:ipv4_` |Resolves to the ipv4 address of the +provided network interface. For example `_en0:ipv4_`. + +|`_[networkInterface]:ipv6_` |Resolves to the ipv6 address of the +provided network interface. For example `_en0:ipv6_`. +|======================================================================= + +When the `cloud-aws` plugin is installed, the following are also allowed +as valid network host settings: + +[cols="<,<",options="header",] +|================================================================== +|EC2 Host Value |Description +|`_ec2:privateIpv4_` |The private IP address (ipv4) of the machine. +|`_ec2:privateDns_` |The private host of the machine. +|`_ec2:publicIpv4_` |The public IP address (ipv4) of the machine. +|`_ec2:publicDns_` |The public host of the machine. +|`_ec2_` |Less verbose option for the private ip address. +|`_ec2:privateIp_` |Less verbose option for the private ip address. +|`_ec2:publicIp_` |Less verbose option for the public ip address. +|================================================================== + +[float] +[[tcp-settings]] +=== TCP Settings + +Any component that uses TCP (like the HTTP, Transport and Memcached) +share the following allowed settings: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`network.tcp.no_delay` |Enable or disable tcp no delay setting. +Defaults to `true`. + +|`network.tcp.keep_alive` |Enable or disable tcp keep alive. By default +not explicitly set. + +|`network.tcp.reuse_address` |Should an address be reused or not. +Defaults to `true` on none windows machines. + +|`network.tcp.send_buffer_size` |The size of the tcp send buffer size +(in size setting format). By default not explicitly set. + +|`network.tcp.receive_buffer_size` |The size of the tcp receive buffer +size (in size setting format). By default not explicitly set. +|======================================================================= + diff --git a/docs/reference/modules/node.asciidoc b/docs/reference/modules/node.asciidoc new file mode 100644 index 0000000..5e40522 --- /dev/null +++ b/docs/reference/modules/node.asciidoc @@ -0,0 +1,32 @@ +[[modules-node]] +== Node + +*elasticsearch* allows to configure a node to either be allowed to store +data locally or not. Storing data locally basically means that shards of +different indices are allowed to be allocated on that node. By default, +each node is considered to be a data node, and it can be turned off by +setting `node.data` to `false`. + +This is a powerful setting allowing to simply create smart load +balancers that take part in some of different API processing. Lets take +an example: + +We can start a whole cluster of data nodes which do not even start an +HTTP transport by setting `http.enabled` to `false`. Such nodes will +communicate with one another using the +<<modules-transport,transport>> module. In front +of the cluster we can start one or more "non data" nodes which will +start with HTTP enabled. All HTTP communication will be performed +through these "non data" nodes. + +The benefit of using that is first the ability to create smart load +balancers. These "non data" nodes are still part of the cluster, and +they redirect operations exactly to the node that holds the relevant +data. The other benefit is the fact that for scatter / gather based +operations (such as search), these nodes will take part of the +processing since they will start the scatter process, and perform the +actual gather processing. + +This relieves the data nodes to do the heavy duty of indexing and +searching, without needing to process HTTP requests (parsing), overload +the network, or perform the gather processing. diff --git a/docs/reference/modules/plugins.asciidoc b/docs/reference/modules/plugins.asciidoc new file mode 100644 index 0000000..6c39d72 --- /dev/null +++ b/docs/reference/modules/plugins.asciidoc @@ -0,0 +1,283 @@ +[[modules-plugins]] +== Plugins + +[float] +=== Plugins + +Plugins are a way to enhance the basic elasticsearch functionality in a +custom manner. They range from adding custom mapping types, custom +analyzers (in a more built in fashion), native scripts, custom discovery +and more. + +[float] +[[installing]] +==== Installing plugins + +Installing plugins can either be done manually by placing them under the +`plugins` directory, or using the `plugin` script. Several plugins can +be found under the https://github.com/elasticsearch[elasticsearch] +organization in GitHub, starting with `elasticsearch-`. + +Installing plugins typically take the following form: + +[source,shell] +----------------------------------- +plugin --install <org>/<user/component>/<version> +----------------------------------- + +The plugins will be +automatically downloaded in this case from `download.elasticsearch.org`, +and in case they don't exist there, from maven (central and sonatype). + +Note that when the plugin is located in maven central or sonatype +repository, `<org>` is the artifact `groupId` and `<user/component>` is +the `artifactId`. + +A plugin can also be installed directly by specifying the URL for it, +for example: + +[source,shell] +----------------------------------- +bin/plugin --url file:///path/to/plugin --install plugin-name +----------------------------------- + + +You can run `bin/plugin -h`. + +[float] +[[site-plugins]] +==== Site Plugins + +Plugins can have "sites" in them, any plugin that exists under the +`plugins` directory with a `_site` directory, its content will be +statically served when hitting `/_plugin/[plugin_name]/` url. Those can +be added even after the process has started. + +Installed plugins that do not contain any java related content, will +automatically be detected as site plugins, and their content will be +moved under `_site`. + +The ability to install plugins from Github allows to easily install site +plugins hosted there by downloading the actual repo, for example, +running: + +[source,js] +-------------------------------------------------- +bin/plugin --install mobz/elasticsearch-head +bin/plugin --install lukas-vlcek/bigdesk +-------------------------------------------------- + +Will install both of those site plugins, with `elasticsearch-head` +available under `http://localhost:9200/_plugin/head/` and `bigdesk` +available under `http://localhost:9200/_plugin/bigdesk/`. + +[float] +==== Mandatory Plugins + +If you rely on some plugins, you can define mandatory plugins using the +`plugin.mandatory` attribute, for example, here is a sample config: + +[source,js] +-------------------------------------------------- +plugin.mandatory: mapper-attachments,lang-groovy +-------------------------------------------------- + +For safety reasons, if a mandatory plugin is not installed, the node +will not start. + +[float] +==== Installed Plugins + +A list of the currently loaded plugins can be retrieved using the +<<cluster-nodes-info,Node Info API>>. + +[float] +==== Removing plugins + +Removing plugins can either be done manually by removing them under the +`plugins` directory, or using the `plugin` script. + +Removing plugins typically take the following form: + +[source,shell] +----------------------------------- +plugin --remove <pluginname> +----------------------------------- + +[float] +==== Silent/Verbose mode + +When running the `plugin` script, you can get more information (debug mode) using `--verbose`. +On the opposite, if you want `plugin` script to be silent, use `--silent` option. + +Note that exit codes could be: + +* `0`: everything was OK +* `64`: unknown command or incorrect option parameter +* `74`: IO error +* `70`: other errors + +[source,shell] +----------------------------------- +bin/plugin --install mobz/elasticsearch-head --verbose +plugin --remove head --silent +----------------------------------- + +[float] +==== Timeout settings + +By default, the `plugin` script will wait indefinitely when downloading before failing. +The timeout parameter can be used to explicitly specify how long it waits. Here is some examples of setting it to +different values: + +[source,shell] +----------------------------------- +# Wait for 30 seconds before failing +bin/plugin --install mobz/elasticsearch-head --timeout 30s + +# Wait for 1 minute before failing +bin/plugin --install mobz/elasticsearch-head --timeout 1m + +# Wait forever (default) +bin/plugin --install mobz/elasticsearch-head --timeout 0 +----------------------------------- + +[float] +[[known-plugins]] +=== Known Plugins + +[float] +[[analysis-plugins]] +==== Analysis Plugins + +.Supported by Elasticsearch +* https://github.com/elasticsearch/elasticsearch-analysis-icu[ICU Analysis plugin] +* https://github.com/elasticsearch/elasticsearch-analysis-kuromoji[Japanese (Kuromoji) Analysis plugin]. +* https://github.com/elasticsearch/elasticsearch-analysis-smartcn[Smart Chinese Analysis Plugin] +* https://github.com/elasticsearch/elasticsearch-analysis-stempel[Stempel (Polish) Analysis plugin] + +.Supported by the community +* https://github.com/barminator/elasticsearch-analysis-annotation[Annotation Analysis Plugin] (by Michal Samek) +* https://github.com/yakaz/elasticsearch-analysis-combo/[Combo Analysis Plugin] (by Olivier Favre, Yakaz) +* https://github.com/jprante/elasticsearch-analysis-hunspell[Hunspell Analysis Plugin] (by Jörg Prante) +* https://github.com/medcl/elasticsearch-analysis-ik[IK Analysis Plugin] (by Medcl) +* https://github.com/suguru/elasticsearch-analysis-japanese[Japanese Analysis plugin] (by suguru). +* https://github.com/medcl/elasticsearch-analysis-mmseg[Mmseg Analysis Plugin] (by Medcl) +* https://github.com/chytreg/elasticsearch-analysis-morfologik[Morfologik (Polish) Analysis plugin] (by chytreg) +* https://github.com/imotov/elasticsearch-analysis-morphology[Russian and English Morphological Analysis Plugin] (by Igor Motov) +* https://github.com/medcl/elasticsearch-analysis-pinyin[Pinyin Analysis Plugin] (by Medcl) +* https://github.com/medcl/elasticsearch-analysis-string2int[String2Integer Analysis Plugin] (by Medcl) + +[float] +[[discovery-plugins]] +==== Discovery Plugins + +.Supported by Elasticsearch +* https://github.com/elasticsearch/elasticsearch-cloud-aws[AWS Cloud Plugin] - EC2 discovery and S3 Repository +* https://github.com/elasticsearch/elasticsearch-cloud-azure[Azure Cloud Plugin] - Azure discovery +* https://github.com/elasticsearch/elasticsearch-cloud-gce[Google Compute Engine Cloud Plugin] - GCE discovery + +[float] +[[river]] +==== River Plugins + +.Supported by Elasticsearch +* https://github.com/elasticsearch/elasticsearch-river-couchdb[CouchDB River Plugin] +* https://github.com/elasticsearch/elasticsearch-river-rabbitmq[RabbitMQ River Plugin] +* https://github.com/elasticsearch/elasticsearch-river-twitter[Twitter River Plugin] +* https://github.com/elasticsearch/elasticsearch-river-wikipedia[Wikipedia River Plugin] + +.Supported by the community +* https://github.com/domdorn/elasticsearch-river-activemq/[ActiveMQ River Plugin] (by Dominik Dorn) +* https://github.com/albogdano/elasticsearch-river-amazonsqs[Amazon SQS River Plugin] (by Alex Bogdanovski) +* https://github.com/xxBedy/elasticsearch-river-csv[CSV River Plugin] (by Martin Bednar) +* http://www.pilato.fr/dropbox/[Dropbox River Plugin] (by David Pilato) +* http://www.pilato.fr/fsriver/[FileSystem River Plugin] (by David Pilato) +* https://github.com/obazoud/elasticsearch-river-git[Git River Plugin] (by Olivier Bazoud) +* https://github.com/uberVU/elasticsearch-river-github[GitHub River Plugin] (by uberVU) +* https://github.com/sksamuel/elasticsearch-river-hazelcast[Hazelcast River Plugin] (by Steve Samuel) +* https://github.com/jprante/elasticsearch-river-jdbc[JDBC River Plugin] (by Jörg Prante) +* https://github.com/qotho/elasticsearch-river-jms[JMS River Plugin] (by Steve Sarandos) +* https://github.com/endgameinc/elasticsearch-river-kafka[Kafka River Plugin] (by Endgame Inc.) +* https://github.com/tlrx/elasticsearch-river-ldap[LDAP River Plugin] (by Tanguy Leroux) +* https://github.com/richardwilly98/elasticsearch-river-mongodb/[MongoDB River Plugin] (by Richard Louapre) +* https://github.com/sksamuel/elasticsearch-river-neo4j[Neo4j River Plugin] (by Steve Samuel) +* https://github.com/jprante/elasticsearch-river-oai/[Open Archives Initiative (OAI) River Plugin] (by Jörg Prante) +* https://github.com/sksamuel/elasticsearch-river-redis[Redis River Plugin] (by Steve Samuel) +* http://dadoonet.github.com/rssriver/[RSS River Plugin] (by David Pilato) +* https://github.com/adamlofts/elasticsearch-river-sofa[Sofa River Plugin] (by adamlofts) +* https://github.com/javanna/elasticsearch-river-solr/[Solr River Plugin] (by Luca Cavanna) +* https://github.com/sunnygleason/elasticsearch-river-st9[St9 River Plugin] (by Sunny Gleason) +* https://github.com/plombard/SubversionRiver[Subversion River Plugin] (by Pascal Lombard) +* https://github.com/kzwang/elasticsearch-river-dynamodb[DynamoDB River Plugin] (by Kevin Wang) + +[float] +[[transport]] +==== Transport Plugins + +.Supported by Elasticsearch +* https://github.com/elasticsearch/elasticsearch-transport-memcached[Memcached transport plugin] +* https://github.com/elasticsearch/elasticsearch-transport-thrift[Thrift Transport] +* https://github.com/elasticsearch/elasticsearch-transport-wares[Servlet transport] + +.Supported by the community +* https://github.com/tlrx/transport-zeromq[ZeroMQ transport layer plugin] (by Tanguy Leroux) +* https://github.com/sonian/elasticsearch-jetty[Jetty HTTP transport plugin] (by Sonian Inc.) +* https://github.com/kzwang/elasticsearch-transport-redis[Redis transport plugin] (by Kevin Wang) + +[float] +[[scripting]] +==== Scripting Plugins + +.Supported by Elasticsearch +* https://github.com/hiredman/elasticsearch-lang-clojure[Clojure Language Plugin] (by Kevin Downey) +* https://github.com/elasticsearch/elasticsearch-lang-groovy[Groovy lang Plugin] +* https://github.com/elasticsearch/elasticsearch-lang-javascript[JavaScript language Plugin] +* https://github.com/elasticsearch/elasticsearch-lang-python[Python language Plugin] + +[float] +[[site]] +==== Site Plugins + +.Supported by the community +* https://github.com/lukas-vlcek/bigdesk[BigDesk Plugin] (by Lukáš Vlček) +* https://github.com/mobz/elasticsearch-head[Elasticsearch Head Plugin] (by Ben Birch) +* https://github.com/royrusso/elasticsearch-HQ[Elasticsearch HQ] (by Roy Russo) +* https://github.com/andrewvc/elastic-hammer[Hammer Plugin] (by Andrew Cholakian) +* https://github.com/polyfractal/elasticsearch-inquisitor[Inquisitor Plugin] (by Zachary Tong) +* https://github.com/karmi/elasticsearch-paramedic[Paramedic Plugin] (by Karel Minařík) +* https://github.com/polyfractal/elasticsearch-segmentspy[SegmentSpy Plugin] (by Zachary Tong) + +[float] +[[repository-plugins]] +==== Snapshot/Restore Repository Plugins + +.Supported by Elasticsearch + +* https://github.com/elasticsearch/elasticsearch-hadoop/tree/master/repository-hdfs[Hadoop HDFS] Repository +* https://github.com/elasticsearch/elasticsearch-cloud-aws#s3-repository[AWS S3] Repository + +.Supported by the community + +* https://github.com/kzwang/elasticsearch-repository-gridfs[GridFS] Repository (by Kevin Wang) + +[float] +[[misc]] +==== Misc Plugins + +.Supported by Elasticsearch +* https://github.com/elasticsearch/elasticsearch-mapper-attachments[Mapper Attachments Type plugin] + +.Supported by the community +* https://github.com/carrot2/elasticsearch-carrot2[carrot2 Plugin]: Results clustering with carrot2 (by Dawid Weiss) +* https://github.com/derryx/elasticsearch-changes-plugin[Elasticsearch Changes Plugin] (by Thomas Peuss) +* https://github.com/johtani/elasticsearch-extended-analyze[Extended Analyze Plugin] (by Jun Ohtani) +* https://github.com/spinscale/elasticsearch-graphite-plugin[Elasticsearch Graphite Plugin] (by Alexander Reelsen) +* https://github.com/mattweber/elasticsearch-mocksolrplugin[Elasticsearch Mock Solr Plugin] (by Matt Weber) +* https://github.com/viniciusccarvalho/elasticsearch-newrelic[Elasticsearch New Relic Plugin] (by Vinicius Carvalho) +* https://github.com/swoop-inc/elasticsearch-statsd-plugin[Elasticsearch Statsd Plugin] (by Swoop Inc.) +* https://github.com/endgameinc/elasticsearch-term-plugin[Terms Component Plugin] (by Endgame Inc.) +* http://tlrx.github.com/elasticsearch-view-plugin[Elasticsearch View Plugin] (by Tanguy Leroux) +* https://github.com/sonian/elasticsearch-zookeeper[ZooKeeper Discovery Plugin] (by Sonian Inc.) + + diff --git a/docs/reference/modules/scripting.asciidoc b/docs/reference/modules/scripting.asciidoc new file mode 100644 index 0000000..166a030 --- /dev/null +++ b/docs/reference/modules/scripting.asciidoc @@ -0,0 +1,316 @@ +[[modules-scripting]] +== Scripting + +The scripting module allows to use scripts in order to evaluate custom +expressions. For example, scripts can be used to return "script fields" +as part of a search request, or can be used to evaluate a custom score +for a query and so on. + +The scripting module uses by default http://mvel.codehaus.org/[mvel] as +the scripting language with some extensions. mvel is used since it is +extremely fast and very simple to use, and in most cases, simple +expressions are needed (for example, mathematical equations). + +Additional `lang` plugins are provided to allow to execute scripts in +different languages. Currently supported plugins are `lang-javascript` +for JavaScript, `lang-groovy` for Groovy, and `lang-python` for Python. +All places where a `script` parameter can be used, a `lang` parameter +(on the same level) can be provided to define the language of the +script. The `lang` options are `mvel`, `js`, `groovy`, `python`, and +`native`. + +[float] +=== Default Scripting Language + +The default scripting language (assuming no `lang` parameter is +provided) is `mvel`. In order to change it set the `script.default_lang` +to the appropriate language. + +[float] +=== Preloaded Scripts + +Scripts can always be provided as part of the relevant API, but they can +also be preloaded by placing them under `config/scripts` and then +referencing them by the script name (instead of providing the full +script). This helps reduce the amount of data passed between the client +and the nodes. + +The name of the script is derived from the hierarchy of directories it +exists under, and the file name without the lang extension. For example, +a script placed under `config/scripts/group1/group2/test.py` will be +named `group1_group2_test`. + +[float] +=== Disabling dynamic scripts + +We recommend running Elasticsearch behind an application or proxy, +which protects Elasticsearch from the outside world. If users are +allowed to run dynamic scripts (even in a search request), then they +have the same access to your box as the user that Elasticsearch is +running as. + +First, you should not run Elasticsearch as the `root` user, as this +would allow a script to access or do *anything* on your server, without +limitations. Second, you should not expose Elasticsearch directly to +users, but instead have a proxy application inbetween. If you *do* +intend to expose Elasticsearch directly to your users, then you have +to decide whether you trust them enough to run scripts on your box or +not. If not, then even if you have a proxy which only allows `GET` +requests, you should disable dynamic scripting by adding the following +setting to the `config/elasticsearch.yml` file on every node: + +[source,yaml] +----------------------------------- +script.disable_dynamic: true +----------------------------------- + +This will still allow execution of named scripts provided in the config, or +_native_ Java scripts registered through plugins, however it will prevent +users from running arbitrary scripts via the API. + +[float] +=== Automatic Script Reloading + +The `config/scripts` directory is scanned periodically for changes. +New and changed scripts are reloaded and deleted script are removed +from preloaded scripts cache. The reload frequency can be specified +using `watcher.interval` setting, which defaults to `60s`. +To disable script reloading completely set `script.auto_reload_enabled` +to `false`. + +[float] +=== Native (Java) Scripts + +Even though `mvel` is pretty fast, allow to register native Java based +scripts for faster execution. + +In order to allow for scripts, the `NativeScriptFactory` needs to be +implemented that constructs the script that will be executed. There are +two main types, one that extends `AbstractExecutableScript` and one that +extends `AbstractSearchScript` (probably the one most users will extend, +with additional helper classes in `AbstractLongSearchScript`, +`AbstractDoubleSearchScript`, and `AbstractFloatSearchScript`). + +Registering them can either be done by settings, for example: +`script.native.my.type` set to `sample.MyNativeScriptFactory` will +register a script named `my`. Another option is in a plugin, access +`ScriptModule` and call `registerScript` on it. + +Executing the script is done by specifying the `lang` as `native`, and +the name of the script as the `script`. + +Note, the scripts need to be in the classpath of elasticsearch. One +simple way to do it is to create a directory under plugins (choose a +descriptive name), and place the jar / classes files there, they will be +automatically loaded. + +[float] +=== Score + +In all scripts that can be used in facets, allow to access the current +doc score using `doc.score`. + +[float] +=== Computing scores based on terms in scripts + +see <<modules-advanced-scripting, advanced scripting documentation>> + +[float] +=== Document Fields + +Most scripting revolve around the use of specific document fields data. +The `doc['field_name']` can be used to access specific field data within +a document (the document in question is usually derived by the context +the script is used). Document fields are very fast to access since they +end up being loaded into memory (all the relevant field values/tokens +are loaded to memory). + +The following data can be extracted from a field: + +[cols="<,<",options="header",] +|======================================================================= +|Expression |Description +|`doc['field_name'].value` |The native value of the field. For example, +if its a short type, it will be short. + +|`doc['field_name'].values` |The native array values of the field. For +example, if its a short type, it will be short[]. Remember, a field can +have several values within a single doc. Returns an empty array if the +field has no values. + +|`doc['field_name'].empty` |A boolean indicating if the field has no +values within the doc. + +|`doc['field_name'].multiValued` |A boolean indicating that the field +has several values within the corpus. + +|`doc['field_name'].lat` |The latitude of a geo point type. + +|`doc['field_name'].lon` |The longitude of a geo point type. + +|`doc['field_name'].lats` |The latitudes of a geo point type. + +|`doc['field_name'].lons` |The longitudes of a geo point type. + +|`doc['field_name'].distance(lat, lon)` |The `plane` distance (in meters) +of this geo point field from the provided lat/lon. + +|`doc['field_name'].distanceWithDefault(lat, lon, default)` |The `plane` distance (in meters) +of this geo point field from the provided lat/lon with a default value. + +|`doc['field_name'].distanceInMiles(lat, lon)` |The `plane` distance (in +miles) of this geo point field from the provided lat/lon. + +|`doc['field_name'].distanceInMilesWithDefault(lat, lon, default)` |The `plane` distance (in +miles) of this geo point field from the provided lat/lon with a default value. + +|`doc['field_name'].distanceInKm(lat, lon)` |The `plane` distance (in +km) of this geo point field from the provided lat/lon. + +|`doc['field_name'].distanceInKmWithDefault(lat, lon, default)` |The `plane` distance (in +km) of this geo point field from the provided lat/lon with a default value. + +|`doc['field_name'].arcDistance(lat, lon)` |The `arc` distance (in +meters) of this geo point field from the provided lat/lon. + +|`doc['field_name'].arcDistanceWithDefault(lat, lon, default)` |The `arc` distance (in +meters) of this geo point field from the provided lat/lon with a default value. + +|`doc['field_name'].arcDistanceInMiles(lat, lon)` |The `arc` distance (in +miles) of this geo point field from the provided lat/lon. + +|`doc['field_name'].arcDistanceInMilesWithDefault(lat, lon, default)` |The `arc` distance (in +miles) of this geo point field from the provided lat/lon with a default value. + +|`doc['field_name'].arcDistanceInKm(lat, lon)` |The `arc` distance (in +km) of this geo point field from the provided lat/lon. + +|`doc['field_name'].arcDistanceInKmWithDefault(lat, lon, default)` |The `arc` distance (in +km) of this geo point field from the provided lat/lon with a default value. + +|`doc['field_name'].factorDistance(lat, lon)` |The distance factor of this geo point field from the provided lat/lon. + +|`doc['field_name'].factorDistance(lat, lon, default)` |The distance factor of this geo point field from the provided lat/lon with a default value. + + +|======================================================================= + +[float] +=== Stored Fields + +Stored fields can also be accessed when executed a script. Note, they +are much slower to access compared with document fields, but are not +loaded into memory. They can be simply accessed using +`_fields['my_field_name'].value` or `_fields['my_field_name'].values`. + +[float] +=== Source Field + +The source field can also be accessed when executing a script. The +source field is loaded per doc, parsed, and then provided to the script +for evaluation. The `_source` forms the context under which the source +field can be accessed, for example `_source.obj2.obj1.field3`. + +Accessing `_source` is much slower compared to using `_doc` +but the data is not loaded into memory. For a single field access `_fields` may be +faster than using `_source` due to the extra overhead of potentially parsing large documents. +However, `_source` may be faster if you access multiple fields or if the source has already been +loaded for other purposes. + + +[float] +=== mvel Built In Functions + +There are several built in functions that can be used within scripts. +They include: + +[cols="<,<",options="header",] +|======================================================================= +|Function |Description +|`time()` |The current time in milliseconds. + +|`sin(a)` |Returns the trigonometric sine of an angle. + +|`cos(a)` |Returns the trigonometric cosine of an angle. + +|`tan(a)` |Returns the trigonometric tangent of an angle. + +|`asin(a)` |Returns the arc sine of a value. + +|`acos(a)` |Returns the arc cosine of a value. + +|`atan(a)` |Returns the arc tangent of a value. + +|`toRadians(angdeg)` |Converts an angle measured in degrees to an +approximately equivalent angle measured in radians + +|`toDegrees(angrad)` |Converts an angle measured in radians to an +approximately equivalent angle measured in degrees. + +|`exp(a)` |Returns Euler's number _e_ raised to the power of value. + +|`log(a)` |Returns the natural logarithm (base _e_) of a value. + +|`log10(a)` |Returns the base 10 logarithm of a value. + +|`sqrt(a)` |Returns the correctly rounded positive square root of a +value. + +|`cbrt(a)` |Returns the cube root of a double value. + +|`IEEEremainder(f1, f2)` |Computes the remainder operation on two +arguments as prescribed by the IEEE 754 standard. + +|`ceil(a)` |Returns the smallest (closest to negative infinity) value +that is greater than or equal to the argument and is equal to a +mathematical integer. + +|`floor(a)` |Returns the largest (closest to positive infinity) value +that is less than or equal to the argument and is equal to a +mathematical integer. + +|`rint(a)` |Returns the value that is closest in value to the argument +and is equal to a mathematical integer. + +|`atan2(y, x)` |Returns the angle _theta_ from the conversion of +rectangular coordinates (_x_, _y_) to polar coordinates (r,_theta_). + +|`pow(a, b)` |Returns the value of the first argument raised to the +power of the second argument. + +|`round(a)` |Returns the closest _int_ to the argument. + +|`random()` |Returns a random _double_ value. + +|`abs(a)` |Returns the absolute value of a value. + +|`max(a, b)` |Returns the greater of two values. + +|`min(a, b)` |Returns the smaller of two values. + +|`ulp(d)` |Returns the size of an ulp of the argument. + +|`signum(d)` |Returns the signum function of the argument. + +|`sinh(x)` |Returns the hyperbolic sine of a value. + +|`cosh(x)` |Returns the hyperbolic cosine of a value. + +|`tanh(x)` |Returns the hyperbolic tangent of a value. + +|`hypot(x, y)` |Returns sqrt(_x2_ + _y2_) without intermediate overflow +or underflow. +|======================================================================= + +[float] +=== Arithmetic precision in MVEL + +When dividing two numbers using MVEL based scripts, the engine tries to +be smart and adheres to the default behaviour of java. This means if you +divide two integers (you might have configured the fields as integer in +the mapping), the result will also be an integer. This means, if a +calculation like `1/num` is happening in your scripts and `num` is an +integer with the value of `8`, the result is `0` even though you were +expecting it to be `0.125`. You may need to enforce precision by +explicitly using a double like `1.0/num` in order to get the expected +result. diff --git a/docs/reference/modules/snapshots.asciidoc b/docs/reference/modules/snapshots.asciidoc new file mode 100644 index 0000000..309b5f8 --- /dev/null +++ b/docs/reference/modules/snapshots.asciidoc @@ -0,0 +1,207 @@ +[[modules-snapshots]] +== Snapshot And Restore + +The snapshot and restore module allows to create snapshots of individual indices or an entire cluster into a remote +repository. At the time of the initial release only shared file system repository is supported. + +[float] +=== Repositories + +Before any snapshot or restore operation can be performed a snapshot repository should be registered in +Elasticsearch. The following command registers a shared file system repository with the name `my_backup` that +will use location `/mount/backups/my_backup` to store snapshots. + +[source,js] +----------------------------------- +$ curl -XPUT 'http://localhost:9200/_snapshot/my_backup' -d '{ + "type": "fs", + "settings": { + "location": "/mount/backups/my_backup", + "compress": true + } +}' +----------------------------------- + +Once repository is registered, its information can be obtained using the following command: + +[source,js] +----------------------------------- +$ curl -XGET 'http://localhost:9200/_snapshot/my_backup?pretty' +----------------------------------- +[source,js] +----------------------------------- +{ + "my_backup" : { + "type" : "fs", + "settings" : { + "compress" : "false", + "location" : "/mount/backups/my_backup" + } + } +} +----------------------------------- + +If a repository name is not specified, or `_all` is used as repository name Elasticsearch will return information about +all repositories currently registered in the cluster: + +[source,js] +----------------------------------- +$ curl -XGET 'http://localhost:9200/_snapshot' +----------------------------------- + +or + +[source,js] +----------------------------------- +$ curl -XGET 'http://localhost:9200/_snapshot/_all' +----------------------------------- + +[float] +===== Shared File System Repository + +The shared file system repository (`"type": "fs"`) is using shared file system to store snapshot. The path +specified in the `location` parameter should point to the same location in the shared filesystem and be accessible +on all data and master nodes. The following settings are supported: + +[horizontal] +`location`:: Location of the snapshots. Mandatory. +`compress`:: Turns on compression of the snapshot files. Defaults to `true`. +`concurrent_streams`:: Throttles the number of streams (per node) preforming snapshot operation. Defaults to `5` +`chunk_size`:: Big files can be broken down into chunks during snapshotting if needed. The chunk size can be specified in bytes or by + using size value notation, i.e. 1g, 10m, 5k. Defaults to `null` (unlimited chunk size). +`max_restore_bytes_per_sec`:: Throttles per node restore rate. Defaults to `20mb` per second. +`max_snapshot_bytes_per_sec`:: Throttles per node snapshot rate. Defaults to `20mb` per second. + + +[float] +===== Read-only URL Repository + +The URL repository (`"type": "url"`) can be used as an alternative read-only way to access data created by shared file +system repository is using shared file system to store snapshot. The URL specified in the `url` parameter should +point to the root of the shared filesystem repository. The following settings are supported: + +[horizontal] +`url`:: Location of the snapshots. Mandatory. +`concurrent_streams`:: Throttles the number of streams (per node) preforming snapshot operation. Defaults to `5` + + +[float] +===== Repository plugins + +Other repository backends are available in these official plugins: + +* https://github.com/elasticsearch/elasticsearch-cloud-aws#s3-repository[AWS Cloud Plugin] for S3 repositories +* https://github.com/elasticsearch/elasticsearch-hadoop/tree/master/repository-hdfs[HDFS Plugin] for Hadoop environments +* https://github.com/elasticsearch/elasticsearch-cloud-azure#azure-repository[Azure Cloud Plugin] for Azure storage repositories + +[float] +=== Snapshot + +A repository can contain multiple snapshots of the same cluster. Snapshot are identified by unique names within the +cluster. A snapshot with the name `snapshot_1` in the repository `my_backup` can be created by executing the following +command: + +[source,js] +----------------------------------- +$ curl -XPUT "localhost:9200/_snapshot/my_backup/snapshot_1?wait_for_completion=true" +----------------------------------- + +The `wait_for_completion` parameter specifies whether or not the request should return immediately or wait for snapshot +completion. By default snapshot of all open and started indices in the cluster is created. This behavior can be changed +by specifying the list of indices in the body of the snapshot request. + +[source,js] +----------------------------------- +$ curl -XPUT "localhost:9200/_snapshot/my_backup/snapshot_1" -d '{ + "indices": "index_1,index_2", + "ignore_unavailable": "true", + "include_global_state": false +}' +----------------------------------- + +The list of indices that should be included into the snapshot can be specified using the `indices` parameter that +supports <<search-multi-index-type,multi index syntax>>. The snapshot request also supports the +`ignore_unavailable` option. Setting it to `true` will cause indices that do not exist to be ignored during snapshot +creation. By default, when `ignore_unavailable` option is not set and an index is missing the snapshot request will fail. +By setting `include_global_state` to false it's possible to prevent the cluster global state to be stored as part of +the snapshot. By default, entire snapshot will fail if one or more indices participating in the snapshot don't have +all primary shards available. This behaviour can be changed by setting `partial` to `true`. + +The index snapshot process is incremental. In the process of making the index snapshot Elasticsearch analyses +the list of the index files that are already stored in the repository and copies only files that were created or +changed since the last snapshot. That allows multiple snapshots to be preserved in the repository in a compact form. +Snapshotting process is executed in non-blocking fashion. All indexing and searching operation can continue to be +executed against the index that is being snapshotted. However, a snapshot represents the point-in-time view of the index +at the moment when snapshot was created, so no records that were added to the index after snapshot process had started +will be present in the snapshot. + +Besides creating a copy of each index the snapshot process can also store global cluster metadata, which includes persistent +cluster settings and templates. The transient settings and registered snapshot repositories are not stored as part of +the snapshot. + +Only one snapshot process can be executed in the cluster at any time. While snapshot of a particular shard is being +created this shard cannot be moved to another node, which can interfere with rebalancing process and allocation +filtering. Once snapshot of the shard is finished Elasticsearch will be able to move shard to another node according +to the current allocation filtering settings and rebalancing algorithm. + +Once a snapshot is created information about this snapshot can be obtained using the following command: + +[source,shell] +----------------------------------- +$ curl -XGET "localhost:9200/_snapshot/my_backup/snapshot_1" +----------------------------------- + +All snapshots currently stored in the repository can be listed using the following command: + +[source,shell] +----------------------------------- +$ curl -XGET "localhost:9200/_snapshot/my_backup/_all" +----------------------------------- + +A snapshot can be deleted from the repository using the following command: + +[source,shell] +----------------------------------- +$ curl -XDELETE "localhost:9200/_snapshot/my_backup/snapshot_1" +----------------------------------- + +When a snapshot is deleted from a repository, Elasticsearch deletes all files that are associated with the deleted +snapshot and not used by any other snapshots. If the deleted snapshot operation is executed while the snapshot is being +created the snapshotting process will be aborted and all files created as part of the snapshotting process will be +cleaned. Therefore, the delete snapshot operation can be used to cancel long running snapshot operations that were +started by mistake. + + +[float] +=== Restore + +A snapshot can be restored using this following command: + +[source,shell] +----------------------------------- +$ curl -XPOST "localhost:9200/_snapshot/my_backup/snapshot_1/_restore" +----------------------------------- + +By default, all indices in the snapshot as well as cluster state are restored. It's possible to select indices that +should be restored as well as prevent global cluster state from being restored by using `indices` and +`include_global_state` options in the restore request body. The list of indices supports +<<search-multi-index-type,multi index syntax>>. The `rename_pattern` and `rename_replacement` options can be also used to +rename index on restore using regular expression that supports referencing the original text as explained +http://docs.oracle.com/javase/6/docs/api/java/util/regex/Matcher.html#appendReplacement(java.lang.StringBuffer,%20java.lang.String)[here]. + +[source,js] +----------------------------------- +$ curl -XPOST "localhost:9200/_snapshot/my_backup/snapshot_1/_restore" -d '{ + "indices": "index_1,index_2", + "ignore_unavailable": "true", + "include_global_state": false, + "rename_pattern": "index_(.+)", + "rename_replacement": "restored_index_$1" +}' +----------------------------------- + +The restore operation can be performed on a functioning cluster. However, an existing index can be only restored if it's +closed. The restore operation automatically opens restored indices if they were closed and creates new indices if they +didn't exist in the cluster. If cluster state is restored, the restored templates that don't currently exist in the +cluster are added and existing templates with the same name are replaced by the restored templates. The restored +persistent settings are added to the existing persistent settings. diff --git a/docs/reference/modules/threadpool.asciidoc b/docs/reference/modules/threadpool.asciidoc new file mode 100644 index 0000000..50d7a92 --- /dev/null +++ b/docs/reference/modules/threadpool.asciidoc @@ -0,0 +1,117 @@ +[[modules-threadpool]] +== Thread Pool + +A node holds several thread pools in order to improve how threads are +managed and memory consumption within a node. There are several thread +pools, but the important ones include: + +[horizontal] +`index`:: + For index/delete operations, defaults to `fixed`, + size `# of available processors`. + queue_size `200`. + +`search`:: + For count/search operations, defaults to `fixed`, + size `3x # of available processors`. + queue_size `1000`. + +`suggest`:: + For suggest operations, defaults to `fixed`, + size `# of available processors`. + queue_size `1000`. + +`get`:: + For get operations, defaults to `fixed` + size `# of available processors`. + queue_size `1000`. + +`bulk`:: + For bulk operations, defaults to `fixed` + size `# of available processors`. + queue_size `50`. + +`percolate`:: + For percolate operations, defaults to `fixed` + size `# of available processors`. + queue_size `1000`. + +`warmer`:: + For segment warm-up operations, defaults to `scaling` + with a `5m` keep-alive. + +`refresh`:: + For refresh operations, defaults to `scaling` + with a `5m` keep-alive. + +Changing a specific thread pool can be done by setting its type and +specific type parameters, for example, changing the `index` thread pool +to have more threads: + +[source,js] +-------------------------------------------------- +threadpool: + index: + type: fixed + size: 30 +-------------------------------------------------- + +NOTE: you can update threadpool settings live using + <<cluster-update-settings>>. + + +[float] +[[types]] +=== Thread pool types + +The following are the types of thread pools that can be used and their +respective parameters: + +[float] +==== `cache` + +The `cache` thread pool is an unbounded thread pool that will spawn a +thread if there are pending requests. Here is an example of how to set +it: + +[source,js] +-------------------------------------------------- +threadpool: + index: + type: cached +-------------------------------------------------- + +[float] +==== `fixed` + +The `fixed` thread pool holds a fixed size of threads to handle the +requests with a queue (optionally bounded) for pending requests that +have no threads to service them. + +The `size` parameter controls the number of threads, and defaults to the +number of cores times 5. + +The `queue_size` allows to control the size of the queue of pending +requests that have no threads to execute them. By default, it is set to +`-1` which means its unbounded. When a request comes in and the queue is +full, it will abort the request. + +[source,js] +-------------------------------------------------- +threadpool: + index: + type: fixed + size: 30 + queue_size: 1000 +-------------------------------------------------- + +[float] +[[processors]] +=== Processors setting +The number of processors is automatically detected, and the thread pool +settings are automatically set based on it. Sometimes, the number of processors +are wrongly detected, in such cases, the number of processors can be +explicitly set using the `processors` setting. + +In order to check the number of processors detected, use the nodes info +API with the `os` flag. diff --git a/docs/reference/modules/thrift.asciidoc b/docs/reference/modules/thrift.asciidoc new file mode 100644 index 0000000..85e229f --- /dev/null +++ b/docs/reference/modules/thrift.asciidoc @@ -0,0 +1,25 @@ +[[modules-thrift]] +== Thrift + +The thrift transport module allows to expose the REST interface of +elasticsearch using thrift. Thrift should provide better performance +over http. Since thrift provides both the wire protocol and the +transport, it should make using it simpler (thought its lacking on +docs...). + +Using thrift requires installing the `transport-thrift` plugin, located +https://github.com/elasticsearch/elasticsearch-transport-thrift[here]. + +The thrift +https://github.com/elasticsearch/elasticsearch-transport-thrift/blob/master/elasticsearch.thrift[schema] +can be used to generate thrift clients. + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`thrift.port` |The port to bind to. Defaults to 9500-9600 + +|`thrift.frame` |Defaults to `-1`, which means no framing. Set to a +higher value to specify the frame size (like `15mb`). +|======================================================================= + diff --git a/docs/reference/modules/transport.asciidoc b/docs/reference/modules/transport.asciidoc new file mode 100644 index 0000000..62fe6d0 --- /dev/null +++ b/docs/reference/modules/transport.asciidoc @@ -0,0 +1,49 @@ +[[modules-transport]] +== Transport + +The transport module is used for internal communication between nodes +within the cluster. Each call that goes from one node to the other uses +the transport module (for example, when an HTTP GET request is processed +by one node, and should actually be processed by another node that holds +the data). + +The transport mechanism is completely asynchronous in nature, meaning +that there is no blocking thread waiting for a response. The benefit of +using asynchronous communication is first solving the +http://en.wikipedia.org/wiki/C10k_problem[C10k problem], as well as +being the idle solution for scatter (broadcast) / gather operations such +as search in Elasticsearch. + +[float] +=== TCP Transport + +The TCP transport is an implementation of the transport module using +TCP. It allows for the following settings: + +[cols="<,<",options="header",] +|======================================================================= +|Setting |Description +|`transport.tcp.port` |A bind port range. Defaults to `9300-9400`. + +|`transport.publish_port` |The port that other nodes in the cluster +should use when communicating with this node. Useful when a cluster node +is behind a proxy or firewall and the `transport.tcp.port` is not directly +addressable from the outside. Defaults to the actual port assigned via +`transport.tcp.port`. + +|`transport.tcp.connect_timeout` |The socket connect timeout setting (in +time setting format). Defaults to `30s`. + +|`transport.tcp.compress` |Set to `true` to enable compression (LZF) +between all nodes. Defaults to `false`. +|======================================================================= + +It also shares the uses the common +<<modules-network,network settings>>. + +[float] +=== Local Transport + +This is a handy transport to use when running integration tests within +the JVM. It is automatically enabled when using +`NodeBuilder#local(true)`. diff --git a/docs/reference/modules/tribe.asciidoc b/docs/reference/modules/tribe.asciidoc new file mode 100644 index 0000000..fb998bf --- /dev/null +++ b/docs/reference/modules/tribe.asciidoc @@ -0,0 +1,58 @@ +[[modules-tribe]] +== Tribe node + +The _tribes_ feature allows a _tribe node_ to act as a federated client across +multiple clusters. + +The tribe node works by retrieving the cluster state from all connected +clusters and merging them into a global cluster state. With this information +at hand, it is able to perform read and write operations against the nodes in +all clusters as if they were local. + +The `elasticsearch.yml` config file for a tribe node just needs to list the +clusters that should be joined, for instance: + +[source,yaml] +-------------------------------- +tribe: + t1: <1> + cluster.name: cluster_one + t2: <1> + cluster.name: cluster_two +-------------------------------- +<1> `t1` and `t2` are aribitrary names representing the connection to each + cluster. + +The example above configures connections to two clusters, name `t1` and `t2` +respectively. The tribe node will create a <<modules-node,node client>> to +connect each cluster using <<multicast,multicast discovery>> by default. Any +other settings for the connection can be configured under `tribe.{name}`, just +like the `cluster.name` in the example. + +The merged global cluster state means that almost all operations work in the +same way as a single cluster: distributed search, suggest, percolation, +indexing, etc. + +However, there are a few exceptions: + +* The merged view cannot handle indices with the same name in multiple + clusters. It will pick one of them and discard the other. + +* Master level read operations (eg <<cluster-state>>, <<cluster-health>>) + will automatically execute with a local flag set to true since there is + no master. + +* Master level write operations (eg <<indices-create-index>>) are not + allowed. These should be performed on a single cluster. + +The tribe node can be configured to block all write operations and all +metadata operations with: + +[source,yaml] +-------------------------------- +tribe: + blocks: + write: true + metadata: true +-------------------------------- + diff --git a/docs/reference/query-dsl.asciidoc b/docs/reference/query-dsl.asciidoc new file mode 100644 index 0000000..32c1fb5 --- /dev/null +++ b/docs/reference/query-dsl.asciidoc @@ -0,0 +1,42 @@ +[[query-dsl]] += Query DSL + +[partintro] +-- +*elasticsearch* provides a full Query DSL based on JSON to define +queries. In general, there are basic queries such as +<<query-dsl-term-query,term>> or +<<query-dsl-prefix-query,prefix>>. There are +also compound queries like the +<<query-dsl-bool-query,bool>> query. Queries can +also have filters associated with them such as the +<<query-dsl-filtered-query,filtered>> or +<<query-dsl-constant-score-query,constant_score>> +queries, with specific filter queries. + +Think of the Query DSL as an AST of queries. Certain queries can contain +other queries (like the +<<query-dsl-bool-query,bool>> query), others can +contain filters (like the +<<query-dsl-constant-score-query,constant_score>>), +and some can contain both a query and a filter (like the +<<query-dsl-filtered-query,filtered>>). Each of +those can contain *any* query of the list of queries or *any* filter +from the list of filters, resulting in the ability to build quite +complex (and interesting) queries. + +Both queries and filters can be used in different APIs. For example, +within a <<search-request-query,search query>>, or +as a <<search-facets,facet filter>>. This +section explains the components (queries and filters) that can form the +AST one can use. + +Filters are very handy since they perform an order of magnitude better +than plain queries since no scoring is performed and they are +automatically cached. + +-- + +include::query-dsl/queries.asciidoc[] + +include::query-dsl/filters.asciidoc[] diff --git a/docs/reference/query-dsl/filters.asciidoc b/docs/reference/query-dsl/filters.asciidoc new file mode 100644 index 0000000..7e4149f --- /dev/null +++ b/docs/reference/query-dsl/filters.asciidoc @@ -0,0 +1,104 @@ +[[query-dsl-filters]] +== Filters + +As a general rule, filters should be used instead of queries: + +* for binary yes/no searches +* for queries on exact values + +[float] +[[caching]] +=== Filters and Caching + +Filters can be a great candidate for caching. Caching the result of a +filter does not require a lot of memory, and will cause other queries +executing against the same filter (same parameters) to be blazingly +fast. + +Some filters already produce a result that is easily cacheable, and the +difference between caching and not caching them is the act of placing +the result in the cache or not. These filters, which include the +<<query-dsl-term-filter,term>>, +<<query-dsl-terms-filter,terms>>, +<<query-dsl-prefix-filter,prefix>>, and +<<query-dsl-range-filter,range>> filters, are by +default cached and are recommended to use (compared to the equivalent +query version) when the same filter (same parameters) will be used +across multiple different queries (for example, a range filter with age +higher than 10). + +Other filters, usually already working with the field data loaded into +memory, are not cached by default. Those filters are already very fast, +and the process of caching them requires extra processing in order to +allow the filter result to be used with different queries than the one +executed. These filters, including the geo, +and <<query-dsl-script-filter,script>> filters +are not cached by default. + +The last type of filters are those working with other filters. The +<<query-dsl-and-filter,and>>, +<<query-dsl-not-filter,not>> and +<<query-dsl-or-filter,or>> filters are not +cached as they basically just manipulate the internal filters. + +All filters allow to set `_cache` element on them to explicitly control +caching. They also allow to set `_cache_key` which will be used as the +caching key for that filter. This can be handy when using very large +filters (like a terms filter with many elements in it). + +include::filters/and-filter.asciidoc[] + +include::filters/bool-filter.asciidoc[] + +include::filters/exists-filter.asciidoc[] + +include::filters/geo-bounding-box-filter.asciidoc[] + +include::filters/geo-distance-filter.asciidoc[] + +include::filters/geo-distance-range-filter.asciidoc[] + +include::filters/geo-polygon-filter.asciidoc[] + +include::filters/geo-shape-filter.asciidoc[] + +include::filters/geohash-cell-filter.asciidoc[] + +include::filters/has-child-filter.asciidoc[] + +include::filters/has-parent-filter.asciidoc[] + +include::filters/ids-filter.asciidoc[] + +include::filters/indices-filter.asciidoc[] + +include::filters/limit-filter.asciidoc[] + +include::filters/match-all-filter.asciidoc[] + +include::filters/missing-filter.asciidoc[] + +include::filters/nested-filter.asciidoc[] + +include::filters/not-filter.asciidoc[] + +include::filters/or-filter.asciidoc[] + +include::filters/prefix-filter.asciidoc[] + +include::filters/query-filter.asciidoc[] + +include::filters/range-filter.asciidoc[] + +include::filters/regexp-filter.asciidoc[] + +include::filters/script-filter.asciidoc[] + +include::filters/term-filter.asciidoc[] + +include::filters/terms-filter.asciidoc[] + +include::filters/type-filter.asciidoc[] + + + diff --git a/docs/reference/query-dsl/filters/and-filter.asciidoc b/docs/reference/query-dsl/filters/and-filter.asciidoc new file mode 100644 index 0000000..6f171cf --- /dev/null +++ b/docs/reference/query-dsl/filters/and-filter.asciidoc @@ -0,0 +1,69 @@ +[[query-dsl-and-filter]] +=== And Filter + +A filter that matches documents using `AND` boolean operator on other +filters. Can be placed within queries that accept a filter. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "and" : [ + { + "range" : { + "postDate" : { + "from" : "2010-03-01", + "to" : "2010-04-01" + } + } + }, + { + "prefix" : { "name.second" : "ba" } + } + ] + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` in order to cache it (though usually not needed). Since +the `_cache` element requires to be set on the `and` filter itself, the +structure then changes a bit to have the filters provided within a +`filters` element: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "and" : { + "filters": [ + { + "range" : { + "postDate" : { + "from" : "2010-03-01", + "to" : "2010-04-01" + } + } + }, + { + "prefix" : { "name.second" : "ba" } + } + ], + "_cache" : true + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/bool-filter.asciidoc b/docs/reference/query-dsl/filters/bool-filter.asciidoc new file mode 100644 index 0000000..bf36d26 --- /dev/null +++ b/docs/reference/query-dsl/filters/bool-filter.asciidoc @@ -0,0 +1,49 @@ +[[query-dsl-bool-filter]] +=== Bool Filter + +A filter that matches documents matching boolean combinations of other +queries. Similar in concept to +<<query-dsl-bool-query,Boolean query>>, except +that the clauses are other filters. Can be placed within queries that +accept a filter. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "queryString" : { + "default_field" : "message", + "query" : "elasticsearch" + } + }, + "filter" : { + "bool" : { + "must" : { + "term" : { "tag" : "wow" } + }, + "must_not" : { + "range" : { + "age" : { "from" : 10, "to" : 20 } + } + }, + "should" : [ + { + "term" : { "tag" : "sometag" } + }, + { + "term" : { "tag" : "sometagtag" } + } + ] + } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the `bool` filter is not cached by default (though +internal filters might be). The `_cache` can be set to `true` in order +to enable caching. diff --git a/docs/reference/query-dsl/filters/exists-filter.asciidoc b/docs/reference/query-dsl/filters/exists-filter.asciidoc new file mode 100644 index 0000000..80e9495 --- /dev/null +++ b/docs/reference/query-dsl/filters/exists-filter.asciidoc @@ -0,0 +1,20 @@ +[[query-dsl-exists-filter]] +=== Exists Filter + +Filters documents where a specific field has a value in them. + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "exists" : { "field" : "user" } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is always cached. diff --git a/docs/reference/query-dsl/filters/geo-bounding-box-filter.asciidoc b/docs/reference/query-dsl/filters/geo-bounding-box-filter.asciidoc new file mode 100644 index 0000000..7f16ec5 --- /dev/null +++ b/docs/reference/query-dsl/filters/geo-bounding-box-filter.asciidoc @@ -0,0 +1,240 @@ +[[query-dsl-geo-bounding-box-filter]] +=== Geo Bounding Box Filter + +A filter allowing to filter hits based on a point location using a +bounding box. Assuming the following indexed document: + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "location" : { + "lat" : 40.12, + "lon" : -71.34 + } + } +} +-------------------------------------------------- + +Then the following simple query can be executed with a +`geo_bounding_box` filter: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_bounding_box" : { + "pin.location" : { + "top_left" : { + "lat" : 40.73, + "lon" : -74.1 + }, + "bottom_right" : { + "lat" : 40.01, + "lon" : -71.12 + } + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Accepted Formats + +In much the same way the geo_point type can accept different +representation of the geo point, the filter can accept it as well: + +[float] +===== Lat Lon As Properties + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_bounding_box" : { + "pin.location" : { + "top_left" : { + "lat" : 40.73, + "lon" : -74.1 + }, + "bottom_right" : { + "lat" : 40.01, + "lon" : -71.12 + } + } + } + } + } +} +-------------------------------------------------- + +[float] +===== Lat Lon As Array + +Format in `[lon, lat]`, note, the order of lon/lat here in order to +conform with http://geojson.org/[GeoJSON]. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_bounding_box" : { + "pin.location" : { + "top_left" : [-74.1, 40.73], + "bottom_right" : [-71.12, 40.01] + } + } + } + } +} +-------------------------------------------------- + +[float] +===== Lat Lon As String + +Format in `lat,lon`. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_bounding_box" : { + "pin.location" : { + "top_left" : "40.73, -74.1", + "bottom_right" : "40.01, -71.12" + } + } + } + } +} +-------------------------------------------------- + +[float] +===== Geohash + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_bounding_box" : { + "pin.location" : { + "top_left" : "dr5r9ydj2y73", + "bottom_right" : "drj7teegpus6" + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Vertices + +The vertices of the bounding box can either be set by `top_left` and +`bottom_right` or by `top_right` and `bottom_left` parameters. More +over the names `topLeft`, `bottomRight`, `topRight` and `bottomLeft` +are supported. Instead of setting the values pairwise, one can use +the simple names `top`, `left`, `bottom` and `right` to set the +values separately. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_bounding_box" : { + "pin.location" : { + "top" : -74.1, + "left" : 40.73, + "bottom" : -71.12, + "right" : 40.01 + } + } + } + } +} +-------------------------------------------------- + + +[float] +==== geo_point Type + +The filter *requires* the `geo_point` type to be set on the relevant +field. + +[float] +==== Multi Location Per Document + +The filter can work with multiple locations / points per document. Once +a single location / point matches the filter, the document will be +included in the filter + +[float] +==== Type + +The type of the bounding box execution by default is set to `memory`, +which means in memory checks if the doc falls within the bounding box +range. In some cases, an `indexed` option will perform faster (but note +that the `geo_point` type must have lat and lon indexed in this case). +Note, when using the indexed option, multi locations per document field +are not supported. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_bounding_box" : { + "pin.location" : { + "top_left" : { + "lat" : 40.73, + "lon" : -74.1 + }, + "bottom_right" : { + "lat" : 40.10, + "lon" : -71.12 + } + }, + "type" : "indexed" + } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` to cache the *result* of the filter. This is handy when +the same bounding box parameters are used on several (many) other +queries. Note, the process of caching the first execution is higher when +caching (since it needs to satisfy different queries). diff --git a/docs/reference/query-dsl/filters/geo-distance-filter.asciidoc b/docs/reference/query-dsl/filters/geo-distance-filter.asciidoc new file mode 100644 index 0000000..f501398 --- /dev/null +++ b/docs/reference/query-dsl/filters/geo-distance-filter.asciidoc @@ -0,0 +1,184 @@ +[[query-dsl-geo-distance-filter]] +=== Geo Distance Filter + +Filters documents that include only hits that exists within a specific +distance from a geo point. Assuming the following indexed json: + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "location" : { + "lat" : 40.12, + "lon" : -71.34 + } + } +} +-------------------------------------------------- + +Then the following simple query can be executed with a `geo_distance` +filter: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_distance" : { + "distance" : "200km", + "pin.location" : { + "lat" : 40, + "lon" : -70 + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Accepted Formats + +In much the same way the `geo_point` type can accept different +representation of the geo point, the filter can accept it as well: + +[float] +===== Lat Lon As Properties + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_distance" : { + "distance" : "12km", + "pin.location" : { + "lat" : 40, + "lon" : -70 + } + } + } + } +} +-------------------------------------------------- + +[float] +===== Lat Lon As Array + +Format in `[lon, lat]`, note, the order of lon/lat here in order to +conform with http://geojson.org/[GeoJSON]. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_distance" : { + "distance" : "12km", + "pin.location" : [40, -70] + } + } + } +} +-------------------------------------------------- + +[float] +===== Lat Lon As String + +Format in `lat,lon`. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_distance" : { + "distance" : "12km", + "pin.location" : "40,-70" + } + } + } +} +-------------------------------------------------- + +[float] +===== Geohash + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_distance" : { + "distance" : "12km", + "pin.location" : "drm3btev3e86" + } + } + } +} +-------------------------------------------------- + +[float] +==== Options + +The following are options allowed on the filter: + +[horizontal] + +`distance`:: + + The radius of the circle centred on the specified location. Points which + fall into this circle are considered to be matches. The `distance` can be + specified in various units. See <<distance-units>>. + +`distance_type`:: + + How to compute the distance. Can either be `arc` (better precision), + `sloppy_arc` (faster but less precise) or `plane` (fastest). Defaults + to `sloppy_arc`. + +`optimize_bbox`:: + + Whether to use the optimization of first running a bounding box check + before the distance check. Defaults to `memory` which will do in memory + checks. Can also have values of `indexed` to use indexed value check (make + sure the `geo_point` type index lat lon in this case), or `none` which + disables bounding box optimization. + + +[float] +==== geo_point Type + +The filter *requires* the `geo_point` type to be set on the relevant +field. + +[float] +==== Multi Location Per Document + +The `geo_distance` filter can work with multiple locations / points per +document. Once a single location / point matches the filter, the +document will be included in the filter. + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` to cache the *result* of the filter. This is handy when +the same point and distance parameters are used on several (many) other +queries. Note, the process of caching the first execution is higher when +caching (since it needs to satisfy different queries). diff --git a/docs/reference/query-dsl/filters/geo-distance-range-filter.asciidoc b/docs/reference/query-dsl/filters/geo-distance-range-filter.asciidoc new file mode 100644 index 0000000..1bc4197 --- /dev/null +++ b/docs/reference/query-dsl/filters/geo-distance-range-filter.asciidoc @@ -0,0 +1,30 @@ +[[query-dsl-geo-distance-range-filter]] +=== Geo Distance Range Filter + +Filters documents that exists within a range from a specific point: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_distance_range" : { + "from" : "200km", + "to" : "400km" + "pin.location" : { + "lat" : 40, + "lon" : -70 + } + } + } + } +} +-------------------------------------------------- + +Supports the same point location parameter as the +<<query-dsl-geo-distance-filter,geo_distance>> +filter. And also support the common parameters for range (lt, lte, gt, +gte, from, to, include_upper and include_lower). diff --git a/docs/reference/query-dsl/filters/geo-polygon-filter.asciidoc b/docs/reference/query-dsl/filters/geo-polygon-filter.asciidoc new file mode 100644 index 0000000..a421234 --- /dev/null +++ b/docs/reference/query-dsl/filters/geo-polygon-filter.asciidoc @@ -0,0 +1,126 @@ +[[query-dsl-geo-polygon-filter]] +=== Geo Polygon Filter + +A filter allowing to include hits that only fall within a polygon of +points. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_polygon" : { + "person.location" : { + "points" : [ + {"lat" : 40, "lon" : -70}, + {"lat" : 30, "lon" : -80}, + {"lat" : 20, "lon" : -90} + ] + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Allowed Formats + +[float] +===== Lat Long as Array + +Format in `[lon, lat]`, note, the order of lon/lat here in order to +conform with http://geojson.org/[GeoJSON]. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_polygon" : { + "person.location" : { + "points" : [ + [-70, 40], + [-80, 30], + [-90, 20] + ] + } + } + } + } +} +-------------------------------------------------- + +[float] +===== Lat Lon as String + +Format in `lat,lon`. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_polygon" : { + "person.location" : { + "points" : [ + "40, -70", + "30, -80", + "20, -90" + ] + } + } + } + } +} +-------------------------------------------------- + +[float] +===== Geohash + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geo_polygon" : { + "person.location" : { + "points" : [ + "drn5x1g8cu2y", + "30, -80", + "20, -90" + ] + } + } + } + } +} +-------------------------------------------------- + +[float] +==== geo_point Type + +The filter *requires* the +<<mapping-geo-point-type,geo_point>> type to be +set on the relevant field. + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` to cache the *result* of the filter. This is handy when +the same points parameters are used on several (many) other queries. +Note, the process of caching the first execution is higher when caching +(since it needs to satisfy different queries). diff --git a/docs/reference/query-dsl/filters/geo-shape-filter.asciidoc b/docs/reference/query-dsl/filters/geo-shape-filter.asciidoc new file mode 100644 index 0000000..f97e798 --- /dev/null +++ b/docs/reference/query-dsl/filters/geo-shape-filter.asciidoc @@ -0,0 +1,121 @@ +[[query-dsl-geo-shape-filter]] +=== GeoShape Filter + +Filter documents indexed using the `geo_shape` type. + +Requires the <<mapping-geo-shape-type,geo_shape +Mapping>>. + +You may also use the +<<query-dsl-geo-shape-query,geo_shape Query>>. + +The `geo_shape` Filter uses the same grid square representation as the +geo_shape mapping to find documents that have a shape that intersects +with the query shape. It will also use the same PrefixTree configuration +as defined for the field mapping. + +[float] +==== Filter Format + +The Filter supports two ways of defining the Filter shape, either by +providing a whole shape defintion, or by referencing the name of a shape +pre-indexed in another index. Both formats are defined below with +examples. + +[float] +===== Provided Shape Definition + +Similar to the `geo_shape` type, the `geo_shape` Filter uses +http://www.geojson.org[GeoJSON] to represent shapes. + +Given a document that looks like this: + +[source,js] +-------------------------------------------------- +{ + "name": "Wind & Wetter, Berlin, Germany", + "location": { + "type": "Point", + "coordinates": [13.400544, 52.530286] + } +} +-------------------------------------------------- + +The following query will find the point using the Elasticsearch's +`envelope` GeoJSON extension: + +[source,js] +-------------------------------------------------- +{ + "query":{ + "filtered": { + "query": { + "match_all": {} + }, + "filter": { + "geo_shape": { + "location": { + "shape": { + "type": "envelope", + "coordinates" : [[13.0, 53.0], [14.0, 52.0]] + } + } + } + } + } + } +} +-------------------------------------------------- + +[float] +===== Pre-Indexed Shape + +The Filter also supports using a shape which has already been indexed in +another index and/or index type. This is particularly useful for when +you have a pre-defined list of shapes which are useful to your +application and you want to reference this using a logical name (for +example 'New Zealand') rather than having to provide their coordinates +each time. In this situation it is only necessary to provide: + +* `id` - The ID of the document that containing the pre-indexed shape. +* `index` - Name of the index where the pre-indexed shape is. Defaults +to 'shapes'. +* `type` - Index type where the pre-indexed shape is. +* `path` - The field specified as path containing the pre-indexed shape. +Defaults to 'shape'. + +The following is an example of using the Filter with a pre-indexed +shape: + +[source,js] +-------------------------------------------------- +{ + "filtered": { + "query": { + "match_all": {} + }, + "filter": { + "geo_shape": { + "location": { + "indexed_shape": { + "id": "DEU", + "type": "countries", + "index": "shapes", + "path": "location" + } + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the Filter is not cached by default. Setting `_cache` to +`true` will mean the results of the Filter will be cached. Since shapes +can contain 10s-100s of coordinates and any one differing means a new +shape, it may make sense to only using caching when you are sure that +the shapes will remain reasonably static. + diff --git a/docs/reference/query-dsl/filters/geohash-cell-filter.asciidoc b/docs/reference/query-dsl/filters/geohash-cell-filter.asciidoc new file mode 100644 index 0000000..3440902 --- /dev/null +++ b/docs/reference/query-dsl/filters/geohash-cell-filter.asciidoc @@ -0,0 +1,62 @@ +[[query-dsl-geohash-cell-filter]] +=== Geohash Cell Filter + +The `geohash_cell` filter provides access to a hierarchy of geohashes. +By defining a geohash cell, only <<mapping-geo-point-type,geopoints>> +within this cell will match this filter. + +To get this filter work all prefixes of a geohash need to be indexed. In +example a geohash `u30` needs to be decomposed into three terms: `u30`, +`u3` and `u`. This decomposition must be enabled in the mapping of the +<<mapping-geo-point-type,geopoint>> field that's going to be filtered by +setting the `geohash_prefix` option: + +[source,js] +-------------------------------------------------- +{ + "mappings" : { + "location": { + "properties": { + "pin": { + "type": "geo_point", + "geohash": true, + "geohash_prefix": true, + "geohash_precision": 10 + } + } + } + } +} +-------------------------------------------------- + +The geohash cell can defined by all formats of `geo_points`. If such a cell is +defined by a latitude and longitude pair the size of the cell needs to be +setup. This can be done by the `precision` parameter of the filter. This +parameter can be set to an integer value which sets the length of the geohash +prefix. Instead of setting a geohash length directly it is also possible to +define the precision as distance, in example `"precision": "50m"`. (See +<<distance-units>>.) + +The `neighbor` option of the filter offers the possibility to filter cells +next to the given cell. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "match_all" : {} + }, + "filter" : { + "geohash_cell": { + "pin": { + "lat": 13.4080, + "lon": 52.5186 + }, + "precision": 3, + "neighbors": true + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/has-child-filter.asciidoc b/docs/reference/query-dsl/filters/has-child-filter.asciidoc new file mode 100644 index 0000000..1a8e116 --- /dev/null +++ b/docs/reference/query-dsl/filters/has-child-filter.asciidoc @@ -0,0 +1,57 @@ +[[query-dsl-has-child-filter]] +=== Has Child Filter + +The `has_child` filter accepts a query and the child type to run +against, and results in parent documents that have child docs matching +the query. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "has_child" : { + "type" : "blog_tag", + "query" : { + "term" : { + "tag" : "something" + } + } + } +} +-------------------------------------------------- + +The `type` is the child type to query against. The parent type to return +is automatically detected based on the mappings. + +The way that the filter is implemented is by first running the child +query, doing the matching up to the parent doc for each document +matched. + +The `has_child` filter also accepts a filter instead of a query: + +[source,js] +-------------------------------------------------- +{ + "has_child" : { + "type" : "comment", + "filter" : { + "term" : { + "user" : "john" + } + } + } +} +-------------------------------------------------- + +[float] +==== Memory Considerations + +With the current implementation, all `_id` values are loaded to memory +(heap) in order to support fast lookups, so make sure there is enough +memory for it. + +[float] +==== Caching + +The `has_child` filter cannot be cached in the filter cache. The `_cache` +and `_cache_key` options are a no-op in this filter. Also any filter that +wraps the `has_child` filter either directly or indirectly will not be cached.
\ No newline at end of file diff --git a/docs/reference/query-dsl/filters/has-parent-filter.asciidoc b/docs/reference/query-dsl/filters/has-parent-filter.asciidoc new file mode 100644 index 0000000..fe4f66d --- /dev/null +++ b/docs/reference/query-dsl/filters/has-parent-filter.asciidoc @@ -0,0 +1,60 @@ +[[query-dsl-has-parent-filter]] +=== Has Parent Filter + +The `has_parent` filter accepts a query and a parent type. The query is +executed in the parent document space, which is specified by the parent +type. This filter return child documents which associated parents have +matched. For the rest `has_parent` filter has the same options and works +in the same manner as the `has_child` filter. + +[float] +==== Filter example + +[source,js] +-------------------------------------------------- +{ + "has_parent" : { + "parent_type" : "blog", + "query" : { + "term" : { + "tag" : "something" + } + } + } +} +-------------------------------------------------- + +The `parent_type` field name can also be abbreviated to `type`. + +The way that the filter is implemented is by first running the parent +query, doing the matching up to the child doc for each document matched. + +The `has_parent` filter also accepts a filter instead of a query: + +[source,js] +-------------------------------------------------- +{ + "has_parent" : { + "type" : "blog", + "filter" : { + "term" : { + "text" : "bonsai three" + } + } + } +} +-------------------------------------------------- + +[float] +==== Memory considerations + +With the current implementation, all `_id` values are loaded to memory +(heap) in order to support fast lookups, so make sure there is enough +memory for it. + +[float] +==== Caching + +The `has_parent` filter cannot be cached in the filter cache. The `_cache` +and `_cache_key` options are a no-op in this filter. Also any filter that +wraps the `has_parent` filter either directly or indirectly will not be cached.
\ No newline at end of file diff --git a/docs/reference/query-dsl/filters/ids-filter.asciidoc b/docs/reference/query-dsl/filters/ids-filter.asciidoc new file mode 100644 index 0000000..303fffb --- /dev/null +++ b/docs/reference/query-dsl/filters/ids-filter.asciidoc @@ -0,0 +1,20 @@ +[[query-dsl-ids-filter]] +=== Ids Filter + +Filters documents that only have the provided ids. Note, this filter +does not require the <<mapping-id-field,_id>> +field to be indexed since it works using the +<<mapping-uid-field,_uid>> field. + +[source,js] +-------------------------------------------------- +{ + "ids" : { + "type" : "my_type", + "values" : ["1", "4", "100"] + } +} +-------------------------------------------------- + +The `type` is optional and can be omitted, and can also accept an array +of values. diff --git a/docs/reference/query-dsl/filters/indices-filter.asciidoc b/docs/reference/query-dsl/filters/indices-filter.asciidoc new file mode 100644 index 0000000..05ad232 --- /dev/null +++ b/docs/reference/query-dsl/filters/indices-filter.asciidoc @@ -0,0 +1,37 @@ +[[query-dsl-indices-filter]] +=== Indices Filter + +The `indices` filter can be used when executed across multiple indices, +allowing to have a filter that executes only when executed on an index +that matches a specific list of indices, and another filter that executes +when it is executed on an index that does not match the listed indices. + +[source,js] +-------------------------------------------------- +{ + "indices" : { + "indices" : ["index1", "index2"], + "filter" : { + "term" : { "tag" : "wow" } + }, + "no_match_filter" : { + "term" : { "tag" : "kow" } + } + } +} +-------------------------------------------------- + +You can use the `index` field to provide a single index. + +`no_match_filter` can also have "string" value of `none` (to match no +documents), and `all` (to match all). Defaults to `all`. + +`filter` is mandatory, as well as `indices` (or `index`). + +[TIP] +=================================================================== +The fields order is important: if the `indices` are provided before `filter` +or `no_match_filter`, the related filters get parsed only against the indices +that they are going to be executed on. This is useful to avoid parsing filters +when it is not necessary and prevent potential mapping errors. +=================================================================== diff --git a/docs/reference/query-dsl/filters/limit-filter.asciidoc b/docs/reference/query-dsl/filters/limit-filter.asciidoc new file mode 100644 index 0000000..a590c25 --- /dev/null +++ b/docs/reference/query-dsl/filters/limit-filter.asciidoc @@ -0,0 +1,19 @@ +[[query-dsl-limit-filter]] +=== Limit Filter + +A limit filter limits the number of documents (per shard) to execute on. +For example: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "filter" : { + "limit" : {"value" : 100} + }, + "query" : { + "term" : { "name.first" : "shay" } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/match-all-filter.asciidoc b/docs/reference/query-dsl/filters/match-all-filter.asciidoc new file mode 100644 index 0000000..97adbd1 --- /dev/null +++ b/docs/reference/query-dsl/filters/match-all-filter.asciidoc @@ -0,0 +1,15 @@ +[[query-dsl-match-all-filter]] +=== Match All Filter + +A filter that matches on all documents: + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "match_all" : { } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/missing-filter.asciidoc b/docs/reference/query-dsl/filters/missing-filter.asciidoc new file mode 100644 index 0000000..70685bd --- /dev/null +++ b/docs/reference/query-dsl/filters/missing-filter.asciidoc @@ -0,0 +1,41 @@ +[[query-dsl-missing-filter]] +=== Missing Filter + +Filters documents where a specific field has no value in them. + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "missing" : { "field" : "user" } + } + } +} +-------------------------------------------------- + +By default, the filter will only find "missing" fields, i.e., fields +that have no values. It can be configured also to find fields with an +explicit `null_value` mapped for them. Here is an example that will both +find missing field that don't exists (`existence` set to `true`), or +have null values (`null_value` set to `true`). + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "missing" : { + "field" : "user", + "existence" : true, + "null_value" : true + } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is always cached. diff --git a/docs/reference/query-dsl/filters/nested-filter.asciidoc b/docs/reference/query-dsl/filters/nested-filter.asciidoc new file mode 100644 index 0000000..6235be2 --- /dev/null +++ b/docs/reference/query-dsl/filters/nested-filter.asciidoc @@ -0,0 +1,78 @@ +[[query-dsl-nested-filter]] +=== Nested Filter + +A `nested` filter works in a similar fashion to the +<<query-dsl-nested-query,nested>> query, except it's +used as a filter. It follows exactly the same structure, but also allows +to cache the results (set `_cache` to `true`), and have it named (set +the `_name` value). For example: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { "match_all" : {} }, + "filter" : { + "nested" : { + "path" : "obj1", + "filter" : { + "bool" : { + "must" : [ + { + "term" : {"obj1.name" : "blue"} + }, + { + "range" : {"obj1.count" : {"gt" : 5}} + } + ] + } + }, + "_cache" : true + } + } + } +} +-------------------------------------------------- + +[float] +==== Join option + +The nested filter also supports a `join` option which controls whether to perform the block join or not. +By default, it's enabled. But when it's disabled, it emits the hidden nested documents as hits instead of the joined root document. + +This is useful when a `nested` filter is used in a facet where nested is enabled, like you can see in the example below: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "nested" : { + "path" : "offers", + "query" : { + "match" : { + "offers.color" : "blue" + } + } + } + }, + "facets" : { + "size" : { + "terms" : { + "field" : "offers.size" + }, + "facet_filter" : { + "nested" : { + "path" : "offers", + "query" : { + "match" : { + "offers.color" : "blue" + } + }, + "join" : false + } + }, + "nested" : "offers" + } + } +}' +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/not-filter.asciidoc b/docs/reference/query-dsl/filters/not-filter.asciidoc new file mode 100644 index 0000000..629cb17 --- /dev/null +++ b/docs/reference/query-dsl/filters/not-filter.asciidoc @@ -0,0 +1,82 @@ +[[query-dsl-not-filter]] +=== Not Filter + +A filter that filters out matched documents using a query. Can be placed +within queries that accept a filter. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "not" : { + "range" : { + "postDate" : { + "from" : "2010-03-01", + "to" : "2010-04-01" + } + } + } + } + } +} +-------------------------------------------------- + +Or, in a longer form with a `filter` element: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "not" : { + "filter" : { + "range" : { + "postDate" : { + "from" : "2010-03-01", + "to" : "2010-04-01" + } + } + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` in order to cache it (though usually not needed). Here is +an example: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "not" : { + "filter" : { + "range" : { + "postDate" : { + "from" : "2010-03-01", + "to" : "2010-04-01" + } + } + }, + "_cache" : true + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/or-filter.asciidoc b/docs/reference/query-dsl/filters/or-filter.asciidoc new file mode 100644 index 0000000..9c68cb9 --- /dev/null +++ b/docs/reference/query-dsl/filters/or-filter.asciidoc @@ -0,0 +1,59 @@ +[[query-dsl-or-filter]] +=== Or Filter + +A filter that matches documents using `OR` boolean operator on other +queries. Can be placed within queries that accept a filter. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "or" : [ + { + "term" : { "name.second" : "banon" } + }, + { + "term" : { "name.nick" : "kimchy" } + } + ] + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` in order to cache it (though usually not needed). Since +the `_cache` element requires to be set on the `or` filter itself, the +structure then changes a bit to have the filters provided within a +`filters` element: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "or" : { + "filters" : [ + { + "term" : { "name.second" : "banon" } + }, + { + "term" : { "name.nick" : "kimchy" } + } + ], + "_cache" : true + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/prefix-filter.asciidoc b/docs/reference/query-dsl/filters/prefix-filter.asciidoc new file mode 100644 index 0000000..d29f570 --- /dev/null +++ b/docs/reference/query-dsl/filters/prefix-filter.asciidoc @@ -0,0 +1,37 @@ +[[query-dsl-prefix-filter]] +=== Prefix Filter + +Filters documents that have fields containing terms with a specified +prefix (*not analyzed*). Similar to phrase query, except that it acts as +a filter. Can be placed within queries that accept a filter. + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "prefix" : { "user" : "ki" } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is cached by default. The `_cache` can be set +to `false` in order not to cache it. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "prefix" : { + "user" : "ki", + "_cache" : false + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/query-filter.asciidoc b/docs/reference/query-dsl/filters/query-filter.asciidoc new file mode 100644 index 0000000..8cd3858 --- /dev/null +++ b/docs/reference/query-dsl/filters/query-filter.asciidoc @@ -0,0 +1,50 @@ +[[query-dsl-query-filter]] +=== Query Filter + +Wraps any query to be used as a filter. Can be placed within queries +that accept a filter. + +[source,js] +-------------------------------------------------- +{ + "constantScore" : { + "filter" : { + "query" : { + "query_string" : { + "query" : "this AND that OR thus" + } + } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` to cache the *result* of the filter. This is handy when +the same query is used on several (many) other queries. Note, the +process of caching the first execution is higher when not caching (since +it needs to satisfy different queries). + +Setting the `_cache` element requires a different format for the +`query`: + +[source,js] +-------------------------------------------------- +{ + "constantScore" : { + "filter" : { + "fquery" : { + "query" : { + "query_string" : { + "query" : "this AND that OR thus" + } + }, + "_cache" : true + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/range-filter.asciidoc b/docs/reference/query-dsl/filters/range-filter.asciidoc new file mode 100644 index 0000000..7399d00 --- /dev/null +++ b/docs/reference/query-dsl/filters/range-filter.asciidoc @@ -0,0 +1,55 @@ +[[query-dsl-range-filter]] +=== Range Filter + +Filters documents with fields that have terms within a certain range. +Similar to <<query-dsl-range-query,range +query>>, except that it acts as a filter. Can be placed within queries +that accept a filter. + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "range" : { + "age" : { + "gte": 10, + "lte": 20 + } + } + } + } +} +-------------------------------------------------- + +The `range` filter accepts the following parameters: + +[horizontal] +`gte`:: Greater-than or equal to +`gt`:: Greater-than +`lte`:: Less-than or equal to +`lt`:: Less-than + +[float] +==== Execution + +The `execution` option controls how the range filter internally executes. The `execution` option accepts the following values: + +[horizontal] +`index`:: Uses field's inverted in order to determine of documents fall with in the range filter's from and to range +`fielddata`:: Uses field data in order to determine of documents fall with in the range filter's from and to range. + +In general for small ranges the `index` execution is faster and for longer ranges the `fielddata` execution is faster. + +The `fielddata` execution as the same suggests uses field data and therefor requires more memory, so make you have +sufficient memory on your nodes in order to use this execution mode. It usually makes sense to use it on fields you're +already faceting or sorting by. + +[float] +==== Caching + +The result of the filter is only automatically cached by default if the `execution` is set to `index`. The +`_cache` can be set to `false` to turn it off. + +If the `now` date math expression is used without rounding then a range filter will never be cached even if `_cache` is +set to `true`. Also any filter that wraps this filter will never be cached. diff --git a/docs/reference/query-dsl/filters/regexp-filter.asciidoc b/docs/reference/query-dsl/filters/regexp-filter.asciidoc new file mode 100644 index 0000000..72cc169 --- /dev/null +++ b/docs/reference/query-dsl/filters/regexp-filter.asciidoc @@ -0,0 +1,53 @@ +[[query-dsl-regexp-filter]] +=== Regexp Filter + +The `regexp` filter is similar to the +<<query-dsl-regexp-query,regexp>> query, except +that it is cacheable and can speedup performance in case you are reusing +this filter in your queries. + +See <<regexp-syntax>> for details of the supported regular expression language. + +[source,js] +-------------------------------------------------- +{ + "filtered": { + "query": { + "match_all": {} + }, + "filter": { + "regexp":{ + "name.first" : "s.*y" + } + } + } +} +-------------------------------------------------- + +You can also select the cache name and use the same regexp flags in the +filter as in the query. + +*Note*: You have to enable caching explicitly in order to have the +`regexp` filter cached. + +[source,js] +-------------------------------------------------- +{ + "filtered": { + "query": { + "match_all": {} + }, + "filter": { + "regexp":{ + "name.first" : { + "value" : "s.*y", + "flags" : "INTERSECTION|COMPLEMENT|EMPTY" + }, + "_name":"test", + "_cache" : true, + "_cache_key" : "key" + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/script-filter.asciidoc b/docs/reference/query-dsl/filters/script-filter.asciidoc new file mode 100644 index 0000000..f9e0cd1 --- /dev/null +++ b/docs/reference/query-dsl/filters/script-filter.asciidoc @@ -0,0 +1,53 @@ +[[query-dsl-script-filter]] +=== Script Filter + +A filter allowing to define +<<modules-scripting,scripts>> as filters. For +example: + +[source,js] +---------------------------------------------- +"filtered" : { + "query" : { + ... + }, + "filter" : { + "script" : { + "script" : "doc['num1'].value > 1" + } + } +} +---------------------------------------------- + +[float] +==== Custom Parameters + +Scripts are compiled and cached for faster execution. If the same script +can be used, just with different parameters provider, it is preferable +to use the ability to pass parameters to the script itself, for example: + +[source,js] +---------------------------------------------- +"filtered" : { + "query" : { + ... + }, + "filter" : { + "script" : { + "script" : "doc['num1'].value > param1" + "params" : { + "param1" : 5 + } + } + } +} +---------------------------------------------- + +[float] +==== Caching + +The result of the filter is not cached by default. The `_cache` can be +set to `true` to cache the *result* of the filter. This is handy when +the same script and parameters are used on several (many) other queries. +Note, the process of caching the first execution is higher when caching +(since it needs to satisfy different queries). diff --git a/docs/reference/query-dsl/filters/term-filter.asciidoc b/docs/reference/query-dsl/filters/term-filter.asciidoc new file mode 100644 index 0000000..09cd32d --- /dev/null +++ b/docs/reference/query-dsl/filters/term-filter.asciidoc @@ -0,0 +1,38 @@ +[[query-dsl-term-filter]] +=== Term Filter + +Filters documents that have fields that contain a term (*not analyzed*). +Similar to <<query-dsl-term-query,term query>>, +except that it acts as a filter. Can be placed within queries that +accept a filter, for example: + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "term" : { "user" : "kimchy"} + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is automatically cached by default. The +`_cache` can be set to `false` to turn it off. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "term" : { + "user" : "kimchy", + "_cache" : false + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/filters/terms-filter.asciidoc b/docs/reference/query-dsl/filters/terms-filter.asciidoc new file mode 100644 index 0000000..4de6f12 --- /dev/null +++ b/docs/reference/query-dsl/filters/terms-filter.asciidoc @@ -0,0 +1,227 @@ +[[query-dsl-terms-filter]] +=== Terms Filter + +Filters documents that have fields that match any of the provided terms +(*not analyzed*). For example: + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "terms" : { "user" : ["kimchy", "elasticsearch"]} + } + } +} +-------------------------------------------------- + +The `terms` filter is also aliased with `in` as the filter name for +simpler usage. + +[float] +==== Execution Mode + +The way terms filter executes is by iterating over the terms provided +and finding matches docs (loading into a bitset) and caching it. +Sometimes, we want a different execution model that can still be +achieved by building more complex queries in the DSL, but we can support +them in the more compact model that terms filter provides. + +The `execution` option now has the following options : + +[horizontal] +`plain`:: + The default. Works as today. Iterates over all the terms, + building a bit set matching it, and filtering. The total filter is + cached. + +`fielddata`:: + Generates a terms filters that uses the fielddata cache to + compare terms. This execution mode is great to use when filtering + on a field that is already loaded into the fielddata cache from + faceting, sorting, or index warmers. When filtering on + a large number of terms, this execution can be considerably faster + than the other modes. The total filter is not cached unless + explicitly configured to do so. + +`bool`:: + Generates a term filter (which is cached) for each term, and + wraps those in a bool filter. The bool filter itself is not cached as it + can operate very quickly on the cached term filters. + +`and`:: + Generates a term filter (which is cached) for each term, and + wraps those in an and filter. The and filter itself is not cached. + +`or`:: + Generates a term filter (which is cached) for each term, and + wraps those in an or filter. The or filter itself is not cached. + Generally, the `bool` execution mode should be preferred. + +If you don't want the generated individual term queries to be cached, +you can use: `bool_nocache`, `and_nocache` or `or_nocache` instead, but +be aware that this will affect performance. + +The "total" terms filter caching can still be explicitly controlled +using the `_cache` option. Note the default value for it depends on the +execution value. + +For example: + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "terms" : { + "user" : ["kimchy", "elasticsearch"], + "execution" : "bool", + "_cache": true + } + } + } +} +-------------------------------------------------- + +[float] +==== Caching + +The result of the filter is automatically cached by default. The +`_cache` can be set to `false` to turn it off. + +[float] +==== Terms lookup mechanism + +When it's needed to specify a `terms` filter with a lot of terms it can +be beneficial to fetch those term values from a document in an index. A +concrete example would be to filter tweets tweeted by your followers. +Potentially the amount of user ids specified in the terms filter can be +a lot. In this scenario it makes sense to use the terms filter's terms +lookup mechanism. + +The terms lookup mechanism supports the following options: + +[horizontal] +`index`:: + The index to fetch the term values from. Defaults to the + current index. + +`type`:: + The type to fetch the term values from. + +`id`:: + The id of the document to fetch the term values from. + +`path`:: + The field specified as path to fetch the actual values for the + `terms` filter. + +`routing`:: + A custom routing value to be used when retrieving the + external terms doc. + +`cache`:: + Whether to cache the filter built from the retrieved document + (`true` - default) or whether to fetch and rebuild the filter on every + request (`false`). See "<<query-dsl-terms-filter-lookup-caching,Terms lookup caching>>" below + +The values for the `terms` filter will be fetched from a field in a +document with the specified id in the specified type and index. +Internally a get request is executed to fetch the values from the +specified path. At the moment for this feature to work the `_source` +needs to be stored. + +Also, consider using an index with a single shard and fully replicated +across all nodes if the "reference" terms data is not large. The lookup +terms filter will prefer to execute the get request on a local node if +possible, reducing the need for networking. + +["float",id="query-dsl-terms-filter-lookup-caching"] +==== Terms lookup caching + +There is an additional cache involved, which caches the lookup of the +lookup document to the actual terms. This lookup cache is a LRU cache. +This cache has the following options: + +`indices.cache.filter.terms.size`:: + The size of the lookup cache. The default is `10mb`. + +`indices.cache.filter.terms.expire_after_access`:: + The time after the last read an entry should expire. Disabled by default. + +`indices.cache.filter.terms.expire_after_write`: + The time after the last write an entry should expire. Disabled by default. + +All options for the lookup of the documents cache can only be configured +via the `elasticsearch.yml` file. + +When using the terms lookup the `execution` option isn't taken into +account and behaves as if the execution mode was set to `plain`. + +[float] +==== Terms lookup twitter example + +[source,js] +-------------------------------------------------- +# index the information for user with id 2, specifically, its followers +curl -XPUT localhost:9200/users/user/2 -d '{ + "followers" : ["1", "3"] +}' + +# index a tweet, from user with id 2 +curl -XPUT localhost:9200/tweets/tweet/1 -d '{ + "user" : "2" +}' + +# search on all the tweets that match the followers of user 2 +curl -XGET localhost:9200/tweets/_search -d '{ + "query" : { + "filtered" : { + "filter" : { + "terms" : { + "user" : { + "index" : "users", + "type" : "user", + "id" : "2", + "path" : "followers" + }, + "_cache_key" : "user_2_friends" + } + } + } + } +}' +-------------------------------------------------- + +The above is highly optimized, both in a sense that the list of +followers will not be fetched if the filter is already cached in the +filter cache, and with internal LRU cache for fetching external values +for the terms filter. Also, the entry in the filter cache will not hold +`all` the terms reducing the memory required for it. + +`_cache_key` is recommended to be set, so its simple to clear the cache +associated with it using the clear cache API. For example: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/tweets/_cache/clear?filter_keys=user_2_friends' +-------------------------------------------------- + +The structure of the external terms document can also include array of +inner objects, for example: + +[source,js] +-------------------------------------------------- +curl -XPUT localhost:9200/users/user/2 -d '{ + "followers" : [ + { + "id" : "1" + }, + { + "id" : "2" + } + ] +}' +-------------------------------------------------- + +In which case, the lookup path will be `followers.id`. diff --git a/docs/reference/query-dsl/filters/type-filter.asciidoc b/docs/reference/query-dsl/filters/type-filter.asciidoc new file mode 100644 index 0000000..07bde38 --- /dev/null +++ b/docs/reference/query-dsl/filters/type-filter.asciidoc @@ -0,0 +1,15 @@ +[[query-dsl-type-filter]] +=== Type Filter + +Filters documents matching the provided document / mapping type. Note, +this filter can work even when the `_type` field is not indexed (using +the <<mapping-uid-field,_uid>> field). + +[source,js] +-------------------------------------------------- +{ + "type" : { + "value" : "my_type" + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries.asciidoc b/docs/reference/query-dsl/queries.asciidoc new file mode 100644 index 0000000..e82600a --- /dev/null +++ b/docs/reference/query-dsl/queries.asciidoc @@ -0,0 +1,83 @@ +[[query-dsl-queries]] +== Queries + +As a general rule, queries should be used instead of filters: + +* for full text search +* where the result depends on a relevance score + +include::queries/match-query.asciidoc[] + +include::queries/multi-match-query.asciidoc[] + +include::queries/bool-query.asciidoc[] + +include::queries/boosting-query.asciidoc[] + +include::queries/common-terms-query.asciidoc[] + +include::queries/constant-score-query.asciidoc[] + +include::queries/dis-max-query.asciidoc[] + +include::queries/filtered-query.asciidoc[] + +include::queries/flt-query.asciidoc[] + +include::queries/flt-field-query.asciidoc[] + +include::queries/function-score-query.asciidoc[] + +include::queries/fuzzy-query.asciidoc[] + +include::queries/geo-shape-query.asciidoc[] + +include::queries/has-child-query.asciidoc[] + +include::queries/has-parent-query.asciidoc[] + +include::queries/ids-query.asciidoc[] + +include::queries/indices-query.asciidoc[] + +include::queries/match-all-query.asciidoc[] + +include::queries/mlt-query.asciidoc[] + +include::queries/mlt-field-query.asciidoc[] + +include::queries/nested-query.asciidoc[] + +include::queries/prefix-query.asciidoc[] + +include::queries/query-string-query.asciidoc[] + +include::queries/simple-query-string-query.asciidoc[] + +include::queries/range-query.asciidoc[] + +include::queries/regexp-query.asciidoc[] + +include::queries/span-first-query.asciidoc[] + +include::queries/span-multi-term-query.asciidoc[] + +include::queries/span-near-query.asciidoc[] + +include::queries/span-not-query.asciidoc[] + +include::queries/span-or-query.asciidoc[] + +include::queries/span-term-query.asciidoc[] + +include::queries/term-query.asciidoc[] + +include::queries/terms-query.asciidoc[] + +include::queries/top-children-query.asciidoc[] + +include::queries/wildcard-query.asciidoc[] + +include::queries/minimum-should-match.asciidoc[] + +include::queries/multi-term-rewrite.asciidoc[] diff --git a/docs/reference/query-dsl/queries/bool-query.asciidoc b/docs/reference/query-dsl/queries/bool-query.asciidoc new file mode 100644 index 0000000..a9b565c --- /dev/null +++ b/docs/reference/query-dsl/queries/bool-query.asciidoc @@ -0,0 +1,54 @@ +[[query-dsl-bool-query]] +=== Bool Query + +A query that matches documents matching boolean combinations of other +queries. The bool query maps to Lucene `BooleanQuery`. It is built using +one or more boolean clauses, each clause with a typed occurrence. The +occurrence types are: + +[cols="<,<",options="header",] +|======================================================================= +|Occur |Description +|`must` |The clause (query) must appear in matching documents. + +|`should` |The clause (query) should appear in the matching document. In +a boolean query with no `must` clauses, one or more `should` clauses +must match a document. The minimum number of should clauses to match can +be set using the +<<query-dsl-minimum-should-match,`minimum_should_match`>> +parameter. + +|`must_not` |The clause (query) must not appear in the matching +documents. +|======================================================================= + +The bool query also supports `disable_coord` parameter (defaults to +`false`). Basically the coord similarity computes a score factor based +on the fraction of all query terms that a document contains. See Lucene +`BooleanQuery` for more details. + +[source,js] +-------------------------------------------------- +{ + "bool" : { + "must" : { + "term" : { "user" : "kimchy" } + }, + "must_not" : { + "range" : { + "age" : { "from" : 10, "to" : 20 } + } + }, + "should" : [ + { + "term" : { "tag" : "wow" } + }, + { + "term" : { "tag" : "elasticsearch" } + } + ], + "minimum_should_match" : 1, + "boost" : 1.0 + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/boosting-query.asciidoc b/docs/reference/query-dsl/queries/boosting-query.asciidoc new file mode 100644 index 0000000..969b3bb --- /dev/null +++ b/docs/reference/query-dsl/queries/boosting-query.asciidoc @@ -0,0 +1,26 @@ +[[query-dsl-boosting-query]] +=== Boosting Query + +The `boosting` query can be used to effectively demote results that +match a given query. Unlike the "NOT" clause in bool query, this still +selects documents that contain undesirable terms, but reduces their +overall score. + +[source,js] +-------------------------------------------------- +{ + "boosting" : { + "positive" : { + "term" : { + "field1" : "value1" + } + }, + "negative" : { + "term" : { + "field2" : "value2" + } + }, + "negative_boost" : 0.2 + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/common-terms-query.asciidoc b/docs/reference/query-dsl/queries/common-terms-query.asciidoc new file mode 100644 index 0000000..256d9bb --- /dev/null +++ b/docs/reference/query-dsl/queries/common-terms-query.asciidoc @@ -0,0 +1,263 @@ +[[query-dsl-common-terms-query]] +=== Common Terms Query + +The `common` terms query is a modern alternative to stopwords which +improves the precision and recall of search results (by taking stopwords +into account), without sacrificing performance. + +[float] +==== The problem + +Every term in a query has a cost. A search for `"The brown fox"` +requires three term queries, one for each of `"the"`, `"brown"` and +`"fox"`, all of which are executed against all documents in the index. +The query for `"the"` is likely to match many documents and thus has a +much smaller impact on relevance than the other two terms. + +Previously, the solution to this problem was to ignore terms with high +frequency. By treating `"the"` as a _stopword_, we reduce the index size +and reduce the number of term queries that need to be executed. + +The problem with this approach is that, while stopwords have a small +impact on relevance, they are still important. If we remove stopwords, +we lose precision, (eg we are unable to distinguish between `"happy"` +and `"not happy"`) and we lose recall (eg text like `"The The"` or +`"To be or not to be"` would simply not exist in the index). + +[float] +==== The solution + +The `common` terms query divides the query terms into two groups: more +important (ie _low frequency_ terms) and less important (ie _high +frequency_ terms which would previously have been stopwords). + +First it searches for documents which match the more important terms. +These are the terms which appear in fewer documents and have a greater +impact on relevance. + +Then, it executes a second query for the less important terms -- terms +which appear frequently and have a low impact on relevance. But instead +of calculating the relevance score for *all* matching documents, it only +calculates the `_score` for documents already matched by the first +query. In this way the high frequency terms can improve the relevance +calculation without paying the cost of poor performance. + +If a query consists only of high frequency terms, then a single query is +executed as an `AND` (conjunction) query, in other words all terms are +required. Even though each individual term will match many documents, +the combination of terms narrows down the resultset to only the most +relevant. The single query can also be executed as an `OR` with a +specific +<<query-dsl-minimum-should-match,`minimum_should_match`>>, +in this case a high enough value should probably be used. + +Terms are allocated to the high or low frequency groups based on the +`cutoff_frequency`, which can be specified as an absolute frequency +(`>=1`) or as a relative frequency (`0.0 .. 1.0`). + +Perhaps the most interesting property of this query is that it adapts to +domain specific stopwords automatically. For example, on a video hosting +site, common terms like `"clip"` or `"video"` will automatically behave +as stopwords without the need to maintain a manual list. + +[float] +==== Examples + +In this example, words that have a document frequency greater than 0.1% +(eg `"this"` and `"is"`) will be treated as _common terms_. + +[source,js] +-------------------------------------------------- +{ + "common": { + "body": { + "query": "this is bonsai cool", + "cutoff_frequency": 0.001 + } + } +} +-------------------------------------------------- + +The number of terms which should match can be controlled with the +<<query-dsl-minimum-should-match,`minimum_should_match`>> +(`high_freq`, `low_freq`), `low_freq_operator` (default `"or"`) and +`high_freq_operator` (default `"or"`) parameters. + +For low frequency terms, set the `low_freq_operator` to `"and"` to make +all terms required: + +[source,js] +-------------------------------------------------- +{ + "common": { + "body": { + "query": "nelly the elephant as a cartoon", + "cutoff_frequency": 0.001, + "low_freq_operator" "and" + } + } +} +-------------------------------------------------- + +which is roughly equivalent to: + +[source,js] +-------------------------------------------------- +{ + "bool": { + "must": [ + { "term": { "body": "nelly"}}, + { "term": { "body": "elephant"}}, + { "term": { "body": "cartoon"}} + ], + "should": [ + { "term": { "body": "the"}} + { "term": { "body": "as"}} + { "term": { "body": "a"}} + ] + } +} +-------------------------------------------------- + +Alternatively use +<<query-dsl-minimum-should-match,`minimum_should_match`>> +to specify a minimum number or percentage of low frequency terms which +must be present, for instance: + +[source,js] +-------------------------------------------------- +{ + "common": { + "body": { + "query": "nelly the elephant as a cartoon", + "cutoff_frequency": 0.001, + "minimum_should_match": 2 + } + } +} +-------------------------------------------------- + +which is roughly equivalent to: + +[source,js] +-------------------------------------------------- +{ + "bool": { + "must": { + "bool": { + "should": [ + { "term": { "body": "nelly"}}, + { "term": { "body": "elephant"}}, + { "term": { "body": "cartoon"}} + ], + "minimum_should_match": 2 + } + }, + "should": [ + { "term": { "body": "the"}} + { "term": { "body": "as"}} + { "term": { "body": "a"}} + ] + } +} +-------------------------------------------------- + +minimum_should_match + +A different +<<query-dsl-minimum-should-match,`minimum_should_match`>> +can be applied for low and high frequency terms with the additional +`low_freq` and `high_freq` parameters Here is an example when providing +additional parameters (note the change in structure): + +[source,js] +-------------------------------------------------- +{ + "common": { + "body": { + "query": "nelly the elephant not as a cartoon", + "cutoff_frequency": 0.001, + "minimum_should_match": { + "low_freq" : 2, + "high_freq" : 3 + } + } + } +} +-------------------------------------------------- + +which is roughly equivalent to: + +[source,js] +-------------------------------------------------- +{ + "bool": { + "must": { + "bool": { + "should": [ + { "term": { "body": "nelly"}}, + { "term": { "body": "elephant"}}, + { "term": { "body": "cartoon"}} + ], + "minimum_should_match": 2 + } + }, + "should": { + "bool": { + "should": [ + { "term": { "body": "the"}}, + { "term": { "body": "not"}}, + { "term": { "body": "as"}}, + { "term": { "body": "a"}} + ], + "minimum_should_match": 3 + } + } + } +} +-------------------------------------------------- + +In this case it means the high frequency terms have only an impact on +relevance when there are at least three of them. But the most +interesting use of the +<<query-dsl-minimum-should-match,`minimum_should_match`>> +for high frequency terms is when there are only high frequency terms: + +[source,js] +-------------------------------------------------- +{ + "common": { + "body": { + "query": "how not to be", + "cutoff_frequency": 0.001, + "minimum_should_match": { + "low_freq" : 2, + "high_freq" : 3 + } + } + } +} +-------------------------------------------------- + +which is roughly equivalent to: + +[source,js] +-------------------------------------------------- +{ + "bool": { + "should": [ + { "term": { "body": "how"}}, + { "term": { "body": "not"}}, + { "term": { "body": "to"}}, + { "term": { "body": "be"}} + ], + "minimum_should_match": "3<50%" + } +} +-------------------------------------------------- + +The high frequency generated query is then slightly less restrictive +than with an `AND`. + +The `common` terms query also supports `boost`, `analyzer` and +`disable_coord` as parameters. diff --git a/docs/reference/query-dsl/queries/constant-score-query.asciidoc b/docs/reference/query-dsl/queries/constant-score-query.asciidoc new file mode 100644 index 0000000..06ed6f7 --- /dev/null +++ b/docs/reference/query-dsl/queries/constant-score-query.asciidoc @@ -0,0 +1,36 @@ +[[query-dsl-constant-score-query]] +=== Constant Score Query + +A query that wraps a filter or another query and simply returns a +constant score equal to the query boost for every document in the +filter. Maps to Lucene `ConstantScoreQuery`. + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "filter" : { + "term" : { "user" : "kimchy"} + }, + "boost" : 1.2 + } +} +-------------------------------------------------- + +The filter object can hold only filter elements, not queries. Filters +can be much faster compared to queries since they don't perform any +scoring, especially when they are cached. + +A query can also be wrapped in a `constant_score` query: + +[source,js] +-------------------------------------------------- +{ + "constant_score" : { + "query" : { + "term" : { "user" : "kimchy"} + }, + "boost" : 1.2 + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/dis-max-query.asciidoc b/docs/reference/query-dsl/queries/dis-max-query.asciidoc new file mode 100644 index 0000000..2938c8d --- /dev/null +++ b/docs/reference/query-dsl/queries/dis-max-query.asciidoc @@ -0,0 +1,44 @@ +[[query-dsl-dis-max-query]] +=== Dis Max Query + +A query that generates the union of documents produced by its +subqueries, and that scores each document with the maximum score for +that document as produced by any subquery, plus a tie breaking increment +for any additional matching subqueries. + +This is useful when searching for a word in multiple fields with +different boost factors (so that the fields cannot be combined +equivalently into a single search field). We want the primary score to +be the one associated with the highest boost, not the sum of the field +scores (as Boolean Query would give). If the query is "albino elephant" +this ensures that "albino" matching one field and "elephant" matching +another gets a higher score than "albino" matching both fields. To get +this result, use both Boolean Query and DisjunctionMax Query: for each +term a DisjunctionMaxQuery searches for it in each field, while the set +of these DisjunctionMaxQuery's is combined into a BooleanQuery. + +The tie breaker capability allows results that include the same term in +multiple fields to be judged better than results that include this term +in only the best of those multiple fields, without confusing this with +the better case of two different terms in the multiple fields.The +default `tie_breaker` is `0.0`. + +This query maps to Lucene `DisjunctionMaxQuery`. + +[source,js] +-------------------------------------------------- +{ + "dis_max" : { + "tie_breaker" : 0.7, + "boost" : 1.2, + "queries" : [ + { + "term" : { "age" : 34 } + }, + { + "term" : { "age" : 35 } + } + ] + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/filtered-query.asciidoc b/docs/reference/query-dsl/queries/filtered-query.asciidoc new file mode 100644 index 0000000..bf51e9c --- /dev/null +++ b/docs/reference/query-dsl/queries/filtered-query.asciidoc @@ -0,0 +1,25 @@ +[[query-dsl-filtered-query]] +=== Filtered Query + +A query that applies a filter to the results of another query. This +query maps to Lucene `FilteredQuery`. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "tag" : "wow" } + }, + "filter" : { + "range" : { + "age" : { "from" : 10, "to" : 20 } + } + } + } +} +-------------------------------------------------- + +The filter object can hold only filter elements, not queries. Filters +can be much faster compared to queries since they don't perform any +scoring, especially when they are cached. diff --git a/docs/reference/query-dsl/queries/flt-field-query.asciidoc b/docs/reference/query-dsl/queries/flt-field-query.asciidoc new file mode 100644 index 0000000..205dc61 --- /dev/null +++ b/docs/reference/query-dsl/queries/flt-field-query.asciidoc @@ -0,0 +1,47 @@ +[[query-dsl-flt-field-query]] +=== Fuzzy Like This Field Query + +The `fuzzy_like_this_field` query is the same as the `fuzzy_like_this` +query, except that it runs against a single field. It provides nicer +query DSL over the generic `fuzzy_like_this` query, and support typed +fields query (automatically wraps typed fields with type filter to match +only on the specific type). + +[source,js] +-------------------------------------------------- +{ + "fuzzy_like_this_field" : { + "name.first" : { + "like_text" : "text like this one", + "max_query_terms" : 12 + } + } +} +-------------------------------------------------- + +`fuzzy_like_this_field` can be shortened to `flt_field`. + +The `fuzzy_like_this_field` top level parameters include: + +[cols="<,<",options="header",] +|======================================================================= +|Parameter |Description +|`like_text` |The text to find documents like it, *required*. + +|`ignore_tf` |Should term frequency be ignored. Defaults to `false`. + +|`max_query_terms` |The maximum number of query terms that will be +included in any generated query. Defaults to `25`. + +|`fuzziness` |The fuzziness of the term variants. Defaults +to `0.5`. See <<fuzziness>>. + +|`prefix_length` |Length of required common prefix on variant terms. +Defaults to `0`. + +|`boost` |Sets the boost value of the query. Defaults to `1.0`. + +|`analyzer` |The analyzer that will be used to analyze the text. +Defaults to the analyzer associated with the field. +|======================================================================= + diff --git a/docs/reference/query-dsl/queries/flt-query.asciidoc b/docs/reference/query-dsl/queries/flt-query.asciidoc new file mode 100644 index 0000000..231de6b --- /dev/null +++ b/docs/reference/query-dsl/queries/flt-query.asciidoc @@ -0,0 +1,65 @@ +[[query-dsl-flt-query]] +=== Fuzzy Like This Query + +Fuzzy like this query find documents that are "like" provided text by +running it against one or more fields. + +[source,js] +-------------------------------------------------- +{ + "fuzzy_like_this" : { + "fields" : ["name.first", "name.last"], + "like_text" : "text like this one", + "max_query_terms" : 12 + } +} +-------------------------------------------------- + +`fuzzy_like_this` can be shortened to `flt`. + +The `fuzzy_like_this` top level parameters include: + +[cols="<,<",options="header",] +|======================================================================= +|Parameter |Description +|`fields` |A list of the fields to run the more like this query against. +Defaults to the `_all` field. + +|`like_text` |The text to find documents like it, *required*. + +|`ignore_tf` |Should term frequency be ignored. Defaults to `false`. + +|`max_query_terms` |The maximum number of query terms that will be +included in any generated query. Defaults to `25`. + +|`fuzziness` |The minimum similarity of the term variants. Defaults +to `0.5`. See <<fuzziness>>. + +|`prefix_length` |Length of required common prefix on variant terms. +Defaults to `0`. + +|`boost` |Sets the boost value of the query. Defaults to `1.0`. + +|`analyzer` |The analyzer that will be used to analyze the text. +Defaults to the analyzer associated with the field. +|======================================================================= + +[float] +==== How it Works + +Fuzzifies ALL terms provided as strings and then picks the best n +differentiating terms. In effect this mixes the behaviour of FuzzyQuery +and MoreLikeThis but with special consideration of fuzzy scoring +factors. This generally produces good results for queries where users +may provide details in a number of fields and have no knowledge of +boolean query syntax and also want a degree of fuzzy matching and a fast +query. + +For each source term the fuzzy variants are held in a BooleanQuery with +no coord factor (because we are not looking for matches on multiple +variants in any one doc). Additionally, a specialized TermQuery is used +for variants and does not use that variant term's IDF because this would +favor rarer terms, such as misspellings. Instead, all variants use the +same IDF ranking (the one for the source query term) and this is +factored into the variant's boost. If the source query term does not +exist in the index the average IDF of the variants is used. diff --git a/docs/reference/query-dsl/queries/function-score-query.asciidoc b/docs/reference/query-dsl/queries/function-score-query.asciidoc new file mode 100644 index 0000000..fa5b2bd --- /dev/null +++ b/docs/reference/query-dsl/queries/function-score-query.asciidoc @@ -0,0 +1,491 @@ +[[query-dsl-function-score-query]] +=== Function Score Query + +The `function_score` allows you to modify the score of documents that are +retrieved by a query. This can be useful if, for example, a score +function is computationally expensive and it is sufficient to compute +the score on a filtered set of documents. + +`function_score` provides the same functionality that +`custom_boost_factor`, `custom_score` and +`custom_filters_score` provided +but furthermore adds futher scoring functionality such as +distance and recency scoring (see description below). + +==== Using function score + +To use `function_score`, the user has to define a query and one or +several functions, that compute a new score for each document returned +by the query. + +`function_score` can be used with only one function like this: + +[source,js] +-------------------------------------------------- +"function_score": { + "(query|filter)": {}, + "boost": "boost for the whole query", + "FUNCTION": {}, + "boost_mode":"(multiply|replace|...)" +} +-------------------------------------------------- + +Furthermore, several functions can be combined. In this case one can +optionally choose to apply the function only if a document matches a +given filter: + +[source,js] +-------------------------------------------------- +"function_score": { + "(query|filter)": {}, + "boost": "boost for the whole query", + "functions": [ + { + "filter": {}, + "FUNCTION": {} + }, + { + "FUNCTION": {} + } + ], + "max_boost": number, + "score_mode": "(multiply|max|...)", + "boost_mode": "(multiply|replace|...)" +} +-------------------------------------------------- + +If no filter is given with a function this is equivalent to specifying +`"match_all": {}` + +First, each document is scored by the defined functons. The parameter +`score_mode` specifies how the computed scores are combined: + +[horizontal] +`multiply`:: scores are multiplied (default) +`sum`:: scores are summed +`avg`:: scores are averaged +`first`:: the first function that has a matching filter + is applied +`max`:: maximum score is used +`min`:: minimum score is used + +The new score can be restricted to not exceed a certain limit by setting +the `max_boost` parameter. The default for `max_boost` is FLT_MAX. + +Finally, the newly computed score is combined with the score of the +query. The parameter `boost_mode` defines how: + +[horizontal] +`multiply`:: query score and function score is multiplied (default) +`replace`:: only function score is used, the query score is ignored +`sum`:: query score and function score are added +`avg`:: average +`max`:: max of query score and function score +`min`:: min of query score and function score + + +==== Score functions + +The `function_score` query provides several types of score functions. + +===== Script score + +The `script_score` function allows you to wrap another query and customize +the scoring of it optionally with a computation derived from other numeric +field values in the doc using a script expression. Here is a +simple sample: + +[source,js] +-------------------------------------------------- +"script_score" : { + "script" : "_score * doc['my_numeric_field'].value" +} +-------------------------------------------------- + +On top of the different scripting field values and expression, the +`_score` script parameter can be used to retrieve the score based on the +wrapped query. + +Scripts are cached for faster execution. If the script has parameters +that it needs to take into account, it is preferable to reuse the same +script, and provide parameters to it: + +[source,js] +-------------------------------------------------- +"script_score": { + "lang": "lang", + "params": { + "param1": value1, + "param2": value2 + }, + "script": "_score * doc['my_numeric_field'].value / pow(param1, param2)" +} +-------------------------------------------------- + +Note that unlike the `custom_score` query, the +score of the query is multiplied with the result of the script scoring. If +you wish to inhibit this, set `"boost_mode": "replace"` + +===== Boost factor + +The `boost_factor` score allows you to multiply the score by the provided +`boost_factor`. This can sometimes be desired since boost value set on +specific queries gets normalized, while for this score function it does +not. + +[source,js] +-------------------------------------------------- +"boost_factor" : number +-------------------------------------------------- + +===== Random + +The `random_score` generates scores via a pseudo random number algorithm +that is initialized with a `seed`. + +[source,js] +-------------------------------------------------- +"random_score": { + "seed" : number +} +-------------------------------------------------- + +===== Decay functions + +Decay functions score a document with a function that decays depending +on the distance of a numeric field value of the document from a user +given origin. This is similar to a range query, but with smooth edges +instead of boxes. + +To use distance scoring on a query that has numerical fields, the user +has to define an `origin` and a `scale` for each field. The `origin` +is needed to define the ``central point'' from which the distance +is calculated, and the `scale` to define the rate of decay. The +decay function is specified as + +[source,js] +-------------------------------------------------- +"DECAY_FUNCTION": { + "FIELD_NAME": { + "origin": "11, 12", + "scale": "2km", + "offset": "0km", + "decay": 0.33 + } +} +-------------------------------------------------- + +where `DECAY_FUNCTION` can be "linear", "exp" and "gauss" (see below). The specified field must be a numeric field. In the above example, the field is a <<mapping-geo-point-type>> and origin can be provided in geo format. `scale` and `offset` must be given with a unit in this case. If your field is a date field, you can set `scale` and `offset` as days, weeks, and so on. Example: + +[source,js] +-------------------------------------------------- + "DECAY_FUNCTION": { + "FIELD_NAME": { + "origin": "2013-09-17", + "scale": "10d", + "offset": "5d", + "decay" : 0.5 + } + } +-------------------------------------------------- + + +The format of the origin depends on the <<mapping-date-format>> defined in your mapping. If you do not define the origin, the current time is used. + + +The `offset` and `decay` parameters are optional. + +[horizontal] +`offset`:: + If an `offset` is defined, the decay function will only compute a the + decay function for documents with a distance greater that the defined + `offset`. The default is 0. + +`decay`:: + The `decay` parameter defines how documents are scored at the distance + given at `scale`. If no `decay` is defined, documents at the distance + `scale` will be scored 0.5. + +In the first example, your documents might represents hotels and contain a geo +location field. You want to compute a decay function depending on how +far the hotel is from a given location. You might not immediately see +what scale to choose for the gauss function, but you can say something +like: "At a distance of 2km from the desired location, the score should +be reduced by one third." +The parameter "scale" will then be adjusted automatically to assure that +the score function computes a score of 0.5 for hotels that are 2km away +from the desired location. + + +In the second example, documents with a field value between 2013-09-12 and 2013-09-22 would get a weight of 1.0 and documents which are 15 days from that date a weight of 0.5. + + + +The `DECAY_FUNCTION` determines the shape of the decay: + +[horizontal] +`gauss`:: + +Normal decay, computed as: ++ +image:images/Gaussian.png[] + +`exp`:: + +Exponential decay, computed as: ++ +image:images/Exponential.png[] + + +`linear`:: +Linear decay, computed as: ++ +image:images/Linear.png[]. ++ +In contrast to the normal and exponential decay, this function actually +sets the score to 0 if the field value exceeds twice the user given +scale value. + +==== Detailed example + +Suppose you are searching for a hotel in a certain town. Your budget is +limited. Also, you would like the hotel to be close to the town center, +so the farther the hotel is from the desired location the less likely +you are to check in. + +You would like the query results that match your criterion (for +example, "hotel, Nancy, non-smoker") to be scored with respect to +distance to the town center and also the price. + +Intuitively, you would like to define the town center as the origin and +maybe you are willing to walk 2km to the town center from the hotel. + +In this case your *origin* for the location field is the town center +and the *scale* is ~2km. + +If your budget is low, you would probably prefer something cheap above +something expensive. For the price field, the *origin* would be 0 Euros +and the *scale* depends on how much you are willing to pay, for example 20 Euros. + +In this example, the fields might be called "price" for the price of the +hotel and "location" for the coordinates of this hotel. + +The function for `price` in this case would be + +[source,js] +-------------------------------------------------- +"DECAY_FUNCTION": { + "price": { + "origin": "0", + "scale": "20" + } +} +-------------------------------------------------- + +and for `location`: + +[source,js] +-------------------------------------------------- + +"DECAY_FUNCTION": { + "location": { + "origin": "11, 12", + "scale": "2km" + } +} +-------------------------------------------------- + +where `DECAY_FUNCTION` can be "linear", "exp" and "gauss". + +Suppose you want to multiply these two functions on the original score, +the request would look like this: + +[source,js] +-------------------------------------------------- +curl 'localhost:9200/hotels/_search/' -d '{ +"query": { + "function_score": { + "functions": [ + { + "DECAY_FUNCTION": { + "price": { + "origin": "0", + "scale": "20" + } + } + }, + { + "DECAY_FUNCTION": { + "location": { + "origin": "11, 12", + "scale": "2km" + } + } + } + ], + "query": { + "match": { + "properties": "balcony" + } + }, + "score_mode": "multiply" + } +} +}' +-------------------------------------------------- + +Next, we show how the computed score looks like for each of the three +possible decay functions. + +===== Normal decay, keyword `gauss` + +When choosing `gauss` as the decay function in the above example, the +contour and surface plot of the multiplier looks like this: + +image::https://f.cloud.github.com/assets/4320215/768157/cd0e18a6-e898-11e2-9b3c-f0145078bd6f.png[width="700px"] + +image::https://f.cloud.github.com/assets/4320215/768160/ec43c928-e898-11e2-8e0d-f3c4519dbd89.png[width="700px"] + +Suppose your original search results matches three hotels : + +* "Backback Nap" +* "Drink n Drive" +* "BnB Bellevue". + +"Drink n Drive" is pretty far from your defined location (nearly 2 km) +and is not too cheap (about 13 Euros) so it gets a low factor a factor +of 0.56. "BnB Bellevue" and "Backback Nap" are both pretty close to the +defined location but "BnB Bellevue" is cheaper, so it gets a multiplier +of 0.86 whereas "Backpack Nap" gets a value of 0.66. + +===== Exponential decay, keyword `exp` + +When choosing `exp` as the decay function in the above example, the +contour and surface plot of the multiplier looks like this: + +image::https://f.cloud.github.com/assets/4320215/768161/082975c0-e899-11e2-86f7-174c3a729d64.png[width="700px"] + +image::https://f.cloud.github.com/assets/4320215/768162/0b606884-e899-11e2-907b-aefc77eefef6.png[width="700px"] + +===== Linear' decay, keyword `linear` + +When choosing `linear` as the decay function in the above example, the +contour and surface plot of the multiplier looks like this: + +image::https://f.cloud.github.com/assets/4320215/768164/1775b0ca-e899-11e2-9f4a-776b406305c6.png[width="700px"] + +image::https://f.cloud.github.com/assets/4320215/768165/19d8b1aa-e899-11e2-91bc-6b0553e8d722.png[width="700px"] + +==== Supported fields for decay functions + +Only single valued numeric fields, including time and geo locations, +are supported. + +==== What is a field is missing? + +If the numeric field is missing in the document, the function will +return 1. + +==== Relation to `custom_boost`, `custom_score` and `custom_filters_score` + +The `custom_boost_factor` query + +[source,js] +-------------------------------------------------- +"custom_boost_factor": { + "boost_factor": 5.2, + "query": {...} +} +-------------------------------------------------- + +becomes + +[source,js] +-------------------------------------------------- +"function_score": { + "boost_factor": 5.2, + "query": {...} +} +-------------------------------------------------- + +The `custom_score` query + +[source,js] +-------------------------------------------------- +"custom_score": { + "params": { + "param1": 2, + "param2": 3.1 + }, + "query": {...}, + "script": "_score * doc['my_numeric_field'].value / pow(param1, param2)" +} +-------------------------------------------------- + +becomes + +[source,js] +-------------------------------------------------- +"function_score": { + "boost_mode": "replace", + "query": {...}, + "script_score": { + "params": { + "param1": 2, + "param2": 3.1 + }, + "script": "_score * doc['my_numeric_field'].value / pow(param1, param2)" + } +} +-------------------------------------------------- + +and the `custom_filters_score` + +[source,js] +-------------------------------------------------- +"custom_filters_score": { + "filters": [ + { + "boost_factor": "3", + "filter": {...} + }, + { + "filter": {â¦}, + "script": "_score * doc['my_numeric_field'].value / pow(param1, param2)" + } + ], + "params": { + "param1": 2, + "param2": 3.1 + }, + "query": {...}, + "score_mode": "first" +} +-------------------------------------------------- + +becomes: + +[source,js] +-------------------------------------------------- +"function_score": { + "functions": [ + { + "boost_factor": "3", + "filter": {...} + }, + { + "filter": {...}, + "script_score": { + "params": { + "param1": 2, + "param2": 3.1 + }, + "script": "_score * doc['my_numeric_field'].value / pow(param1, param2)" + } + } + ], + "query": {...}, + "score_mode": "first" +} +-------------------------------------------------- + + diff --git a/docs/reference/query-dsl/queries/fuzzy-query.asciidoc b/docs/reference/query-dsl/queries/fuzzy-query.asciidoc new file mode 100644 index 0000000..082f3f1 --- /dev/null +++ b/docs/reference/query-dsl/queries/fuzzy-query.asciidoc @@ -0,0 +1,102 @@ +[[query-dsl-fuzzy-query]] +=== Fuzzy Query + +The fuzzy query uses similarity based on Levenshtein edit distance for +`string` fields, and a `+/-` margin on numeric and date fields. + +==== String fields + +The `fuzzy` query generates all possible matching terms that are within the +maximum edit distance specified in `fuzziness` and then checks the term +dictionary to find out which of those generated terms actually exist in the +index. + +Here is a simple example: + +[source,js] +-------------------------------------------------- +{ + "fuzzy" : { "user" : "ki" } +} +-------------------------------------------------- + +Or with more advanced settings: + +[source,js] +-------------------------------------------------- +{ + "fuzzy" : { + "user" : { + "value" : "ki", + "boost" : 1.0, + "fuzziness" : 2, + "prefix_length" : 0, + "max_expansions": 100 + } + } +} +-------------------------------------------------- + +[float] +===== Parameters + +[horizontal] +`fuzziness`:: + + The maximum edit distance. Defaults to `AUTO`. See <<fuzziness>>. + +`prefix_length`:: + + The number of initial characters which will not be ``fuzzified''. This + helps to reduce the number of terms which must be examined. Defaults + to `0`. + +`max_expansions`:: + + The maximum number of terms that the `fuzzy` query will expand to. + Defaults to `0`. + + +WARNING: this query can be very heavy if `prefix_length` and `max_expansions` +are both set to their defaults of `0`. This could cause every term in the +index to be examined! + + +[float] +==== Numeric and date fields + +Performs a <<query-dsl-range-query>> ``around'' the value using the +`fuzziness` value as a `+/-` range, where: + + -fuzziness <= field value <= +fuzziness + +For example: + +[source,js] +-------------------------------------------------- +{ + "fuzzy" : { + "price" : { + "value" : 12, + "fuzziness" : 2 + } + } +} +-------------------------------------------------- + +Will result in a range query between 10 and 14. Date fields support +<<time-units,time values>>, eg: + +[source,js] +-------------------------------------------------- +{ + "fuzzy" : { + "created" : { + "value" : "2010-02-05T12:05:07", + "fuzziness" : "1d" + } + } +} +-------------------------------------------------- + +See <<fuzziness>> for more details about accepted values. diff --git a/docs/reference/query-dsl/queries/geo-shape-query.asciidoc b/docs/reference/query-dsl/queries/geo-shape-query.asciidoc new file mode 100644 index 0000000..94cd039 --- /dev/null +++ b/docs/reference/query-dsl/queries/geo-shape-query.asciidoc @@ -0,0 +1,49 @@ +[[query-dsl-geo-shape-query]] +=== GeoShape Query + +Query version of the +<<query-dsl-geo-shape-filter,geo_shape Filter>>. + +Requires the <<mapping-geo-shape-type,geo_shape +Mapping>>. + +Given a document that looks like this: + +[source,js] +-------------------------------------------------- +{ + "name": "Wind & Wetter, Berlin, Germany", + "location": { + "type": "Point", + "coordinates": [13.400544, 52.530286] + } +} +-------------------------------------------------- + +The following query will find the point: + +[source,js] +-------------------------------------------------- +{ + "query": { + "geo_shape": { + "location": { + "shape": { + "type": "envelope", + "coordinates": [[13, 53],[14, 52]] + } + } + } + } +} +-------------------------------------------------- + +See the Filter's documentation for more information. + +[float] +==== Relevancy and Score + +Currently Elasticsearch does not have any notion of geo shape relevancy, +consequently the Query internally uses a `constant_score` Query which +wraps a <<query-dsl-geo-shape-filter,geo_shape +filter>>. diff --git a/docs/reference/query-dsl/queries/has-child-query.asciidoc b/docs/reference/query-dsl/queries/has-child-query.asciidoc new file mode 100644 index 0000000..c562c2b --- /dev/null +++ b/docs/reference/query-dsl/queries/has-child-query.asciidoc @@ -0,0 +1,61 @@ +[[query-dsl-has-child-query]] +=== Has Child Query + +The `has_child` query works the same as the +<<query-dsl-has-child-filter,has_child>> filter, +by automatically wrapping the filter with a +<<query-dsl-constant-score-query,constant_score>> +(when using the default score type). It has the same syntax as the +<<query-dsl-has-child-filter,has_child>> filter: + +[source,js] +-------------------------------------------------- +{ + "has_child" : { + "type" : "blog_tag", + "query" : { + "term" : { + "tag" : "something" + } + } + } +} +-------------------------------------------------- + +An important difference with the `top_children` query is that this query +is always executed in two iterations whereas the `top_children` query +can be executed in one or more iteration. When using the `has_child` +query the `total_hits` is always correct. + +[float] +==== Scoring capabilities + +The `has_child` also has scoring support. The +supported score types are `max`, `sum`, `avg` or `none`. The default is +`none` and yields the same behaviour as in previous versions. If the +score type is set to another value than `none`, the scores of all the +matching child documents are aggregated into the associated parent +documents. The score type can be specified with the `score_type` field +inside the `has_child` query: + +[source,js] +-------------------------------------------------- +{ + "has_child" : { + "type" : "blog_tag", + "score_type" : "sum", + "query" : { + "term" : { + "tag" : "something" + } + } + } +} +-------------------------------------------------- + +[float] +==== Memory Considerations + +With the current implementation, all `_id` values are loaded to memory +(heap) in order to support fast lookups, so make sure there is enough +memory for it. diff --git a/docs/reference/query-dsl/queries/has-parent-query.asciidoc b/docs/reference/query-dsl/queries/has-parent-query.asciidoc new file mode 100644 index 0000000..8ef1f4e --- /dev/null +++ b/docs/reference/query-dsl/queries/has-parent-query.asciidoc @@ -0,0 +1,57 @@ +[[query-dsl-has-parent-query]] +=== Has Parent Query + +The `has_parent` query works the same as the +<<query-dsl-has-parent-filter,has_parent>> +filter, by automatically wrapping the filter with a constant_score (when +using the default score type). It has the same syntax as the +<<query-dsl-has-parent-filter,has_parent>> +filter. + +[source,js] +-------------------------------------------------- +{ + "has_parent" : { + "parent_type" : "blog", + "query" : { + "term" : { + "tag" : "something" + } + } + } +} +-------------------------------------------------- + +[float] +==== Scoring capabilities + +The `has_parent` also has scoring support. The +supported score types are `score` or `none`. The default is `none` and +this ignores the score from the parent document. The score is in this +case equal to the boost on the `has_parent` query (Defaults to 1). If +the score type is set to `score`, then the score of the matching parent +document is aggregated into the child documents belonging to the +matching parent document. The score type can be specified with the +`score_type` field inside the `has_parent` query: + +[source,js] +-------------------------------------------------- +{ + "has_parent" : { + "parent_type" : "blog", + "score_type" : "score", + "query" : { + "term" : { + "tag" : "something" + } + } + } +} +-------------------------------------------------- + +[float] +==== Memory Considerations + +With the current implementation, all `_id` values are loaded to memory +(heap) in order to support fast lookups, so make sure there is enough +memory for it. diff --git a/docs/reference/query-dsl/queries/ids-query.asciidoc b/docs/reference/query-dsl/queries/ids-query.asciidoc new file mode 100644 index 0000000..8de62d7 --- /dev/null +++ b/docs/reference/query-dsl/queries/ids-query.asciidoc @@ -0,0 +1,20 @@ +[[query-dsl-ids-query]] +=== Ids Query + +Filters documents that only have the provided ids. Note, this filter +does not require the <<mapping-id-field,_id>> +field to be indexed since it works using the +<<mapping-uid-field,_uid>> field. + +[source,js] +-------------------------------------------------- +{ + "ids" : { + "type" : "my_type", + "values" : ["1", "4", "100"] + } +} +-------------------------------------------------- + +The `type` is optional and can be omitted, and can also accept an array +of values. diff --git a/docs/reference/query-dsl/queries/indices-query.asciidoc b/docs/reference/query-dsl/queries/indices-query.asciidoc new file mode 100644 index 0000000..c597833 --- /dev/null +++ b/docs/reference/query-dsl/queries/indices-query.asciidoc @@ -0,0 +1,37 @@ +[[query-dsl-indices-query]] +=== Indices Query + +The `indices` query can be used when executed across multiple indices, +allowing to have a query that executes only when executed on an index +that matches a specific list of indices, and another query that executes +when it is executed on an index that does not match the listed indices. + +[source,js] +-------------------------------------------------- +{ + "indices" : { + "indices" : ["index1", "index2"], + "query" : { + "term" : { "tag" : "wow" } + }, + "no_match_query" : { + "term" : { "tag" : "kow" } + } + } +} +-------------------------------------------------- + +You can use the `index` field to provide a single index. + +`no_match_query` can also have "string" value of `none` (to match no +documents), and `all` (to match all). Defaults to `all`. + +`query` is mandatory, as well as `indices` (or `index`). + +[TIP] +=================================================================== +The fields order is important: if the `indices` are provided before `query` +or `no_match_query`, the related queries get parsed only against the indices +that they are going to be executed on. This is useful to avoid parsing queries +when it is not necessary and prevent potential mapping errors. +=================================================================== diff --git a/docs/reference/query-dsl/queries/match-all-query.asciidoc b/docs/reference/query-dsl/queries/match-all-query.asciidoc new file mode 100644 index 0000000..2ea3d41 --- /dev/null +++ b/docs/reference/query-dsl/queries/match-all-query.asciidoc @@ -0,0 +1,20 @@ +[[query-dsl-match-all-query]] +=== Match All Query + +A query that matches all documents. Maps to Lucene `MatchAllDocsQuery`. + +[source,js] +-------------------------------------------------- +{ + "match_all" : { } +} +-------------------------------------------------- + +Which can also have boost associated with it: + +[source,js] +-------------------------------------------------- +{ + "match_all" : { "boost" : 1.2 } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/match-query.asciidoc b/docs/reference/query-dsl/queries/match-query.asciidoc new file mode 100644 index 0000000..d514768 --- /dev/null +++ b/docs/reference/query-dsl/queries/match-query.asciidoc @@ -0,0 +1,234 @@ +[[query-dsl-match-query]] +=== Match Query + +A family of `match` queries that accept text/numerics/dates, analyzes +it, and constructs a query out of it. For example: + +[source,js] +-------------------------------------------------- +{ + "match" : { + "message" : "this is a test" + } +} +-------------------------------------------------- + +Note, `message` is the name of a field, you can substitute the name of +any field (including `_all`) instead. + +[float] +==== Types of Match Queries + +[float] +===== boolean + +The default `match` query is of type `boolean`. It means that the text +provided is analyzed and the analysis process constructs a boolean query +from the provided text. The `operator` flag can be set to `or` or `and` +to control the boolean clauses (defaults to `or`). The minimum number of +should clauses to match can be set using the +<<query-dsl-minimum-should-match,`minimum_should_match`>> +parameter. + +The `analyzer` can be set to control which analyzer will perform the +analysis process on the text. It default to the field explicit mapping +definition, or the default search analyzer. + +`fuzziness` allows _fuzzy matching_ based on the type of field being queried. +See <<fuzziness>> for allowed settings. + +The `prefix_length` and +`max_expansions` can be set in this case to control the fuzzy process. +If the fuzzy option is set the query will use `constant_score_rewrite` +as its <<query-dsl-multi-term-rewrite,rewrite +method>> the `rewrite` parameter allows to control how the query will get +rewritten. + +Here is an example when providing additional parameters (note the slight +change in structure, `message` is the field name): + +[source,js] +-------------------------------------------------- +{ + "match" : { + "message" : { + "query" : "this is a test", + "operator" : "and" + } + } +} +-------------------------------------------------- + +.zero_terms_query +If the analyzer used removes all tokens in a query like a `stop` filter +does, the default behavior is to match no documents at all. In order to +change that the `zero_terms_query` option can be used, which accepts +`none` (default) and `all` which corresponds to a `match_all` query. + +[source,js] +-------------------------------------------------- +{ + "match" : { + "message" : { + "query" : "to be or not to be", + "operator" : "and", + "zero_terms_query": "all" + } + } +} +-------------------------------------------------- + +.cutoff_frequency +The match query supports a `cutoff_frequency` that allows +specifying an absolute or relative document frequency where high +frequent terms are moved into an optional subquery and are only scored +if one of the low frequent (below the cutoff) terms in the case of an +`or` operator or all of the low frequent terms in the case of an `and` +operator match. + +This query allows handling `stopwords` dynamically at runtime, is domain +independent and doesn't require on a stopword file. It prevent scoring / +iterating high frequent terms and only takes the terms into account if a +more significant / lower frequent terms match a document. Yet, if all of +the query terms are above the given `cutoff_frequency` the query is +automatically transformed into a pure conjunction (`and`) query to +ensure fast execution. + +The `cutoff_frequency` can either be relative to the number of documents +in the index if in the range `[0..1)` or absolute if greater or equal to +`1.0`. + +Note: If the `cutoff_frequency` is used and the operator is `and` +_stacked tokens_ (tokens that are on the same position like `synonym` filter emits) +are not handled gracefully as they are in a pure `and` query. For instance the query +`fast fox` is analyzed into 3 terms `[fast, quick, fox]` where `quick` is a synonym +for `fast` on the same token positions the query might require `fast` and `quick` to +match if the operator is `and`. + +Here is an example showing a query composed of stopwords exclusivly: + +[source,js] +-------------------------------------------------- +{ + "match" : { + "message" : { + "query" : "to be or not to be", + "cutoff_frequency" : 0.001 + } + } +} +-------------------------------------------------- + +[float] +===== phrase + +The `match_phrase` query analyzes the text and creates a `phrase` query +out of the analyzed text. For example: + +[source,js] +-------------------------------------------------- +{ + "match_phrase" : { + "message" : "this is a test" + } +} +-------------------------------------------------- + +Since `match_phrase` is only a `type` of a `match` query, it can also be +used in the following manner: + +[source,js] +-------------------------------------------------- +{ + "match" : { + "message" : { + "query" : "this is a test", + "type" : "phrase" + } + } +} +-------------------------------------------------- + +A phrase query matches terms up to a configurable `slop` +(which defaults to 0) in any order. Transposed terms have a slop of 2. + +The `analyzer` can be set to control which analyzer will perform the +analysis process on the text. It default to the field explicit mapping +definition, or the default search analyzer, for example: + +[source,js] +-------------------------------------------------- +{ + "match_phrase" : { + "message" : { + "query" : "this is a test", + "analyzer" : "my_analyzer" + } + } +} +-------------------------------------------------- + +[float] +===== match_phrase_prefix + +The `match_phrase_prefix` is the same as `match_phrase`, except that it +allows for prefix matches on the last term in the text. For example: + +[source,js] +-------------------------------------------------- +{ + "match_phrase_prefix" : { + "message" : "this is a test" + } +} +-------------------------------------------------- + +Or: + +[source,js] +-------------------------------------------------- +{ + "match" : { + "message" : { + "query" : "this is a test", + "type" : "phrase_prefix" + } + } +} +-------------------------------------------------- + +It accepts the same parameters as the phrase type. In addition, it also +accepts a `max_expansions` parameter that can control to how many +prefixes the last term will be expanded. It is highly recommended to set +it to an acceptable value to control the execution time of the query. +For example: + +[source,js] +-------------------------------------------------- +{ + "match_phrase_prefix" : { + "message" : { + "query" : "this is a test", + "max_expansions" : 10 + } + } +} +-------------------------------------------------- + +[float] +==== Comparison to query_string / field + +The match family of queries does not go through a "query parsing" +process. It does not support field name prefixes, wildcard characters, +or other "advance" features. For this reason, chances of it failing are +very small / non existent, and it provides an excellent behavior when it +comes to just analyze and run that text as a query behavior (which is +usually what a text search box does). Also, the `phrase_prefix` type can +provide a great "as you type" behavior to automatically load search +results. + +[float] +==== Other options + +* `lenient` - If set to true will cause format based failures (like +providing text to a numeric field) to be ignored. Defaults to false. diff --git a/docs/reference/query-dsl/queries/minimum-should-match.asciidoc b/docs/reference/query-dsl/queries/minimum-should-match.asciidoc new file mode 100644 index 0000000..bedd496 --- /dev/null +++ b/docs/reference/query-dsl/queries/minimum-should-match.asciidoc @@ -0,0 +1,56 @@ +[[query-dsl-minimum-should-match]] +=== Minimum Should Match + +The `minimum_should_match` parameter possible values: + +[cols="<,<,<",options="header",] +|======================================================================= +|Type |Example |Description +|Integer |`3` |Indicates a fixed value regardless of the number of +optional clauses. + +|Negative integer |`-2` |Indicates that the total number of optional +clauses, minus this number should be mandatory. + +|Percentage |`75%` |Indicates that this percent of the total number of +optional clauses are necessary. The number computed from the percentage +is rounded down and used as the minimum. + +|Negative percentage |`-25%` |Indicates that this percent of the total +number of optional clauses can be missing. The number computed from the +percentage is rounded down, before being subtracted from the total to +determine the minimum. + +|Combination |`3<90%` |A positive integer, followed by the less-than +symbol, followed by any of the previously mentioned specifiers is a +conditional specification. It indicates that if the number of optional +clauses is equal to (or less than) the integer, they are all required, +but if it's greater than the integer, the specification applies. In this +example: if there are 1 to 3 clauses they are all required, but for 4 or +more clauses only 90% are required. + +|Multiple combinations |`2<-25 9<-3` |Multiple conditional +specifications can be separated by spaces, each one only being valid for +numbers greater than the one before it. In this example: if there are 1 +or 2 clauses both are required, if there are 3-9 clauses all but 25% are +required, and if there are more than 9 clauses, all but three are +required. +|======================================================================= + +*NOTE:* + +When dealing with percentages, negative values can be used to get +different behavior in edge cases. 75% and -25% mean the same thing when +dealing with 4 clauses, but when dealing with 5 clauses 75% means 3 are +required, but -25% means 4 are required. + +If the calculations based on the specification determine that no +optional clauses are needed, the usual rules about BooleanQueries still +apply at search time (a BooleanQuery containing no required clauses must +still match at least one optional clause) + +No matter what number the calculation arrives at, a value greater than +the number of optional clauses, or a value less than 1 will never be +used. (ie: no matter how low or how high the result of the calculation +result is, the minimum number of required matches will never be lower +than 1 or greater than the number of clauses. diff --git a/docs/reference/query-dsl/queries/mlt-field-query.asciidoc b/docs/reference/query-dsl/queries/mlt-field-query.asciidoc new file mode 100644 index 0000000..e4f28bb --- /dev/null +++ b/docs/reference/query-dsl/queries/mlt-field-query.asciidoc @@ -0,0 +1,68 @@ +[[query-dsl-mlt-field-query]] +=== More Like This Field Query + +The `more_like_this_field` query is the same as the `more_like_this` +query, except it runs against a single field. It provides nicer query +DSL over the generic `more_like_this` query, and support typed fields +query (automatically wraps typed fields with type filter to match only +on the specific type). + +[source,js] +-------------------------------------------------- +{ + "more_like_this_field" : { + "name.first" : { + "like_text" : "text like this one", + "min_term_freq" : 1, + "max_query_terms" : 12 + } + } +} +-------------------------------------------------- + +`more_like_this_field` can be shortened to `mlt_field`. + +The `more_like_this_field` top level parameters include: + +[cols="<,<",options="header",] +|======================================================================= +|Parameter |Description +|`like_text` |The text to find documents like it, *required*. + +|`percent_terms_to_match` |The percentage of terms to match on (float +value). Defaults to `0.3` (30 percent). + +|`min_term_freq` |The frequency below which terms will be ignored in the +source doc. The default frequency is `2`. + +|`max_query_terms` |The maximum number of query terms that will be +included in any generated query. Defaults to `25`. + +|`stop_words` |An array of stop words. Any word in this set is +considered "uninteresting" and ignored. Even if your Analyzer allows +stopwords, you might want to tell the MoreLikeThis code to ignore them, +as for the purposes of document similarity it seems reasonable to assume +that "a stop word is never interesting". + +|`min_doc_freq` |The frequency at which words will be ignored which do +not occur in at least this many docs. Defaults to `5`. + +|`max_doc_freq` |The maximum frequency in which words may still appear. +Words that appear in more than this many docs will be ignored. Defaults +to unbounded. + +|`min_word_length` |The minimum word length below which words will be +ignored. Defaults to `0`. (Old name "min_word_len" is deprecated) + +|`max_word_length` |The maximum word length above which words will be +ignored. Defaults to unbounded (`0`). (Old name "max_word_len" is deprecated) + +|`boost_terms` |Sets the boost factor to use when boosting terms. +Defaults to `1`. + +|`boost` |Sets the boost value of the query. Defaults to `1.0`. + +|`analyzer` |The analyzer that will be used to analyze the text. +Defaults to the analyzer associated with the field. +|======================================================================= + diff --git a/docs/reference/query-dsl/queries/mlt-query.asciidoc b/docs/reference/query-dsl/queries/mlt-query.asciidoc new file mode 100644 index 0000000..bea704a --- /dev/null +++ b/docs/reference/query-dsl/queries/mlt-query.asciidoc @@ -0,0 +1,67 @@ +[[query-dsl-mlt-query]] +=== More Like This Query + +More like this query find documents that are "like" provided text by +running it against one or more fields. + +[source,js] +-------------------------------------------------- +{ + "more_like_this" : { + "fields" : ["name.first", "name.last"], + "like_text" : "text like this one", + "min_term_freq" : 1, + "max_query_terms" : 12 + } +} +-------------------------------------------------- + +`more_like_this` can be shortened to `mlt`. + +The `more_like_this` top level parameters include: + +[cols="<,<",options="header",] +|======================================================================= +|Parameter |Description +|`fields` |A list of the fields to run the more like this query against. +Defaults to the `_all` field. + +|`like_text` |The text to find documents like it, *required*. + +|`percent_terms_to_match` |The percentage of terms to match on (float +value). Defaults to `0.3` (30 percent). + +|`min_term_freq` |The frequency below which terms will be ignored in the +source doc. The default frequency is `2`. + +|`max_query_terms` |The maximum number of query terms that will be +included in any generated query. Defaults to `25`. + +|`stop_words` |An array of stop words. Any word in this set is +considered "uninteresting" and ignored. Even if your Analyzer allows +stopwords, you might want to tell the MoreLikeThis code to ignore them, +as for the purposes of document similarity it seems reasonable to assume +that "a stop word is never interesting". + +|`min_doc_freq` |The frequency at which words will be ignored which do +not occur in at least this many docs. Defaults to `5`. + +|`max_doc_freq` |The maximum frequency in which words may still appear. +Words that appear in more than this many docs will be ignored. Defaults +to unbounded. + +|`min_word_length` |The minimum word length below which words will be +ignored. Defaults to `0`.(Old name "min_word_len" is deprecated) + +|`max_word_length` |The maximum word length above which words will be +ignored. Defaults to unbounded (`0`). (Old name "max_word_len" is deprecated) + +|`boost_terms` |Sets the boost factor to use when boosting terms. +Defaults to `1`. + +|`boost` |Sets the boost value of the query. Defaults to `1.0`. + +|`analyzer` |The analyzer that will be used to analyze the text. +Defaults to the analyzer associated with the field. +|======================================================================= + diff --git a/docs/reference/query-dsl/queries/multi-match-query.asciidoc b/docs/reference/query-dsl/queries/multi-match-query.asciidoc new file mode 100644 index 0000000..cb098cd --- /dev/null +++ b/docs/reference/query-dsl/queries/multi-match-query.asciidoc @@ -0,0 +1,64 @@ +[[query-dsl-multi-match-query]] +=== Multi Match Query + +The `multi_match` query builds further on top of the `match` query by +allowing multiple fields to be specified. The idea here is to allow to +more easily build a concise match type query over multiple fields +instead of using a relatively more expressive query by using multiple +match queries within a `bool` query. + +The structure of the query is a bit different. Instead of a nested json +object defining the query field, there is a top json level field for +defining the query fields. Example: + +[source,js] +-------------------------------------------------- +{ + "multi_match" : { + "query" : "this is a test", + "fields" : [ "subject", "message" ] + } +} +-------------------------------------------------- + +The `multi_match` query creates either a `bool` or a `dis_max` top level +query. Each field is a query clause in this top level query. The query +clause contains the actual query (the specified 'type' defines what +query this will be). Each query clause is basically a `should` clause. + +[float] +[float] +==== Options + +All options that apply on the `match` query also apply on the +`multi_match` query. The `match` query options apply only on the +individual clauses inside the top level query. + +* `fields` - Fields to be used in the query. +* `use_dis_max` - Boolean indicating to either create a `dis_max` query +or a `bool` query. Defaults to `true`. +* `tie_breaker` - Multiplier value to balance the scores between lower +and higher scoring fields. Only applicable when `use_dis_max` is set to +true. Defaults to `0.0`. + +The query accepts all the options that a regular `match` query accepts. + +[float] +[float] +==== Boosting + +The `multi_match` query supports field boosting via `^` notation in the +fields json field. + +[source,js] +-------------------------------------------------- +{ + "multi_match" : { + "query" : "this is a test", + "fields" : [ "subject^2", "message" ] + } +} +-------------------------------------------------- + +In the above example hits in the `subject` field are 2 times more +important than in the `message` field. diff --git a/docs/reference/query-dsl/queries/multi-term-rewrite.asciidoc b/docs/reference/query-dsl/queries/multi-term-rewrite.asciidoc new file mode 100644 index 0000000..135be67 --- /dev/null +++ b/docs/reference/query-dsl/queries/multi-term-rewrite.asciidoc @@ -0,0 +1,42 @@ +[[query-dsl-multi-term-rewrite]] +=== Multi Term Query Rewrite + +Multi term queries, like +<<query-dsl-wildcard-query,wildcard>> and +<<query-dsl-prefix-query,prefix>> are called +multi term queries and end up going through a process of rewrite. This +also happens on the +<<query-dsl-query-string-query,query_string>>. +All of those queries allow to control how they will get rewritten using +the `rewrite` parameter: + +* When not set, or set to `constant_score_auto`, defaults to +automatically choosing either `constant_score_boolean` or +`constant_score_filter` based on query characteristics. +* `scoring_boolean`: A rewrite method that first translates each term +into a should clause in a boolean query, and keeps the scores as +computed by the query. Note that typically such scores are meaningless +to the user, and require non-trivial CPU to compute, so it's almost +always better to use `constant_score_auto`. This rewrite method will hit +too many clauses failure if it exceeds the boolean query limit (defaults +to `1024`). +* `constant_score_boolean`: Similar to `scoring_boolean` except scores +are not computed. Instead, each matching document receives a constant +score equal to the query's boost. This rewrite method will hit too many +clauses failure if it exceeds the boolean query limit (defaults to +`1024`). +* `constant_score_filter`: A rewrite method that first creates a private +Filter by visiting each term in sequence and marking all docs for that +term. Matching documents are assigned a constant score equal to the +query's boost. +* `top_terms_N`: A rewrite method that first translates each term into +should clause in boolean query, and keeps the scores as computed by the +query. This rewrite method only uses the top scoring terms so it will +not overflow boolean max clause count. The `N` controls the size of the +top scoring terms to use. +* `top_terms_boost_N`: A rewrite method that first translates each term +into should clause in boolean query, but the scores are only computed as +the boost. This rewrite method only uses the top scoring terms so it +will not overflow the boolean max clause count. The `N` controls the +size of the top scoring terms to use. + diff --git a/docs/reference/query-dsl/queries/nested-query.asciidoc b/docs/reference/query-dsl/queries/nested-query.asciidoc new file mode 100644 index 0000000..bc7e07c --- /dev/null +++ b/docs/reference/query-dsl/queries/nested-query.asciidoc @@ -0,0 +1,58 @@ +[[query-dsl-nested-query]] +=== Nested Query + +Nested query allows to query nested objects / docs (see +<<mapping-nested-type,nested mapping>>). The +query is executed against the nested objects / docs as if they were +indexed as separate docs (they are, internally) and resulting in the +root parent doc (or parent nested mapping). Here is a sample mapping we +will work with: + +[source,js] +-------------------------------------------------- +{ + "type1" : { + "properties" : { + "obj1" : { + "type" : "nested" + } + } + } +} +-------------------------------------------------- + +And here is a sample nested query usage: + +[source,js] +-------------------------------------------------- +{ + "nested" : { + "path" : "obj1", + "score_mode" : "avg", + "query" : { + "bool" : { + "must" : [ + { + "match" : {"obj1.name" : "blue"} + }, + { + "range" : {"obj1.count" : {"gt" : 5}} + } + ] + } + } + } +} +-------------------------------------------------- + +The query `path` points to the nested object path, and the `query` (or +`filter`) includes the query that will run on the nested docs matching +the direct path, and joining with the root parent docs. + +The `score_mode` allows to set how inner children matching affects +scoring of parent. It defaults to `avg`, but can be `total`, `max` and +`none`. + +Multi level nesting is automatically supported, and detected, resulting +in an inner nested query to automatically match the relevant nesting +level (and not root) if it exists within another nested query. diff --git a/docs/reference/query-dsl/queries/prefix-query.asciidoc b/docs/reference/query-dsl/queries/prefix-query.asciidoc new file mode 100644 index 0000000..1bcf75a --- /dev/null +++ b/docs/reference/query-dsl/queries/prefix-query.asciidoc @@ -0,0 +1,36 @@ +[[query-dsl-prefix-query]] +=== Prefix Query + +Matches documents that have fields containing terms with a specified +prefix (*not analyzed*). The prefix query maps to Lucene `PrefixQuery`. +The following matches documents where the user field contains a term +that starts with `ki`: + +[source,js] +-------------------------------------------------- +{ + "prefix" : { "user" : "ki" } +} +-------------------------------------------------- + +A boost can also be associated with the query: + +[source,js] +-------------------------------------------------- +{ + "prefix" : { "user" : { "value" : "ki", "boost" : 2.0 } } +} +-------------------------------------------------- + +Or : + +[source,js] +-------------------------------------------------- +{ + "prefix" : { "user" : { "prefix" : "ki", "boost" : 2.0 } } +} +-------------------------------------------------- + +This multi term query allows to control how it gets rewritten using the +<<query-dsl-multi-term-rewrite,rewrite>> +parameter. diff --git a/docs/reference/query-dsl/queries/query-string-query.asciidoc b/docs/reference/query-dsl/queries/query-string-query.asciidoc new file mode 100644 index 0000000..5ce0b4e --- /dev/null +++ b/docs/reference/query-dsl/queries/query-string-query.asciidoc @@ -0,0 +1,161 @@ +[[query-dsl-query-string-query]] +=== Query String Query + +A query that uses a query parser in order to parse its content. Here is +an example: + +[source,js] +-------------------------------------------------- +{ + "query_string" : { + "default_field" : "content", + "query" : "this AND that OR thus" + } +} +-------------------------------------------------- + +The `query_string` top level parameters include: + +[cols="<,<",options="header",] +|======================================================================= +|Parameter |Description +|`query` |The actual query to be parsed. See <<query-string-syntax>>. + +|`default_field` |The default field for query terms if no prefix field +is specified. Defaults to the `index.query.default_field` index +settings, which in turn defaults to `_all`. + +|`default_operator` |The default operator used if no explicit operator +is specified. For example, with a default operator of `OR`, the query +`capital of Hungary` is translated to `capital OR of OR Hungary`, and +with default operator of `AND`, the same query is translated to +`capital AND of AND Hungary`. The default value is `OR`. + +|`analyzer` |The analyzer name used to analyze the query string. + +|`allow_leading_wildcard` |When set, `*` or `?` are allowed as the first +character. Defaults to `true`. + +|`lowercase_expanded_terms` |Whether terms of wildcard, prefix, fuzzy, +and range queries are to be automatically lower-cased or not (since they +are not analyzed). Default it `true`. + +|`enable_position_increments` |Set to `true` to enable position +increments in result queries. Defaults to `true`. + +|`fuzzy_max_expansions` |Controls the number of terms fuzzy queries will +expand to. Defaults to `50` + +|`fuzziness` |Set the fuzziness for fuzzy queries. Defaults +to `AUTO`. See <<fuzziness>> for allowed settings. + +|`fuzzy_prefix_length` |Set the prefix length for fuzzy queries. Default +is `0`. + +|`phrase_slop` |Sets the default slop for phrases. If zero, then exact +phrase matches are required. Default value is `0`. + +|`boost` |Sets the boost value of the query. Defaults to `1.0`. + +|`analyze_wildcard` |By default, wildcards terms in a query string are +not analyzed. By setting this value to `true`, a best effort will be +made to analyze those as well. + +|`auto_generate_phrase_queries` |Default to `false`. + +|`minimum_should_match` |A value controlling how many "should" clauses +in the resulting boolean query should match. It can be an absolute value +(`2`), a percentage (`30%`) or a +<<query-dsl-minimum-should-match,combination of +both>>. + +|`lenient` |If set to `true` will cause format based failures (like +providing text to a numeric field) to be ignored. +|======================================================================= + +When a multi term query is being generated, one can control how it gets +rewritten using the +<<query-dsl-multi-term-rewrite,rewrite>> +parameter. + +[float] +==== Default Field + +When not explicitly specifying the field to search on in the query +string syntax, the `index.query.default_field` will be used to derive +which field to search on. It defaults to `_all` field. + +So, if `_all` field is disabled, it might make sense to change it to set +a different default field. + +[float] +==== Multi Field + +The `query_string` query can also run against multiple fields. The idea +of running the `query_string` query against multiple fields is by +internally creating several queries for the same query string, each with +`default_field` that match the fields provided. Since several queries +are generated, combining them can be automatically done either using a +`dis_max` query or a simple `bool` query. For example (the `name` is +boosted by 5 using `^5` notation): + +[source,js] +-------------------------------------------------- +{ + "query_string" : { + "fields" : ["content", "name^5"], + "query" : "this AND that OR thus", + "use_dis_max" : true + } +} +-------------------------------------------------- + +Simple wildcard can also be used to search "within" specific inner +elements of the document. For example, if we have a `city` object with +several fields (or inner object with fields) in it, we can automatically +search on all "city" fields: + +[source,js] +-------------------------------------------------- +{ + "query_string" : { + "fields" : ["city.*"], + "query" : "this AND that OR thus", + "use_dis_max" : true + } +} +-------------------------------------------------- + +Another option is to provide the wildcard fields search in the query +string itself (properly escaping the `*` sign), for example: +`city.\*:something`. + +When running the `query_string` query against multiple fields, the +following additional parameters are allowed: + +[cols="<,<",options="header",] +|======================================================================= +|Parameter |Description +|`use_dis_max` |Should the queries be combined using `dis_max` (set it +to `true`), or a `bool` query (set it to `false`). Defaults to `true`. + +|`tie_breaker` |When using `dis_max`, the disjunction max tie breaker. +Defaults to `0`. +|======================================================================= + +The fields parameter can also include pattern based field names, +allowing to automatically expand to the relevant fields (dynamically +introduced fields included). For example: + +[source,js] +-------------------------------------------------- +{ + "query_string" : { + "fields" : ["content", "name.*^5"], + "query" : "this AND that OR thus", + "use_dis_max" : true + } +} +-------------------------------------------------- + +include::query-string-syntax.asciidoc[] diff --git a/docs/reference/query-dsl/queries/query-string-syntax.asciidoc b/docs/reference/query-dsl/queries/query-string-syntax.asciidoc new file mode 100644 index 0000000..dbc47c6 --- /dev/null +++ b/docs/reference/query-dsl/queries/query-string-syntax.asciidoc @@ -0,0 +1,295 @@ +[[query-string-syntax]] + +==== Query string syntax + +The query string ``mini-language'' is used by the +<<query-dsl-query-string-query>> and by the +`q` query string parameter in the <<search-search,`search` API>>. + +The query string is parsed into a series of _terms_ and _operators_. A +term can be a single word -- `quick` or `brown` -- or a phrase, surrounded by +double quotes -- `"quick brown"` -- which searches for all the words in the +phrase, in the same order. + +Operators allow you to customize the search -- the available options are +explained below. + +===== Field names + +As mentioned in <<query-dsl-query-string-query>>, the `default_field` is searched for the +search terms, but it is possible to specify other fields in the query syntax: + +* where the `status` field contains `active` + + status:active + +* where the `title` field contains `quick` or `brown` + + title:(quick brown) + +* where the `author` field contains the exact phrase `"john smith"` + + author:"John Smith" + +* where any of the fields `book.title`, `book.content` or `book.date` contains + `quick` or `brown` (note how we need to escape the `*` with a backslash): + + book.\*:(quick brown) + +* where the field `title` has no value (or is missing): + + _missing_:title + +* where the field `title` has any non-null value: + + _exists_:title + +===== Wildcards + +Wildcard searches can be run on individual terms, using `?` to replace +a single character, and `*` to replace zero or more characters: + + qu?ck bro* + +Be aware that wildcard queries can use an enormous amount of memory and +perform very badly -- just think how many terms need to be queried to +match the query string `"a* b* c*"`. + +[WARNING] +====== +Allowing a wildcard at the beginning of a word (eg `"*ing"`) is particularly +heavy, because all terms in the index need to be examined, just in case +they match. Leading wildcards can be disabled by setting +`allow_leading_wildcard` to `false`. +====== + +Wildcarded terms are not analyzed by default -- they are lowercased +(`lowercase_expanded_terms` defaults to `true`) but no further analysis +is done, mainly because it is impossible to accurately analyze a word that +is missing some of its letters. However, by setting `analyze_wildcard` to +`true`, an attempt will be made to analyze wildcarded words before searching +the term list for matching terms. + +===== Regular expressions + +Regular expression patterns can be embedded in the query string by +wrapping them in forward-slashes (`"/"`): + + name:/joh?n(ath[oa]n)/ + +The supported regular expression syntax is explained in <<regexp-syntax>>. + +[WARNING] +====== +The `allow_leading_wildcard` parameter does not have any control over +regular expressions. A query string such as the following would force +Elasticsearch to visit every term in the index: + + /.*n/ + +Use with caution! +====== + +===== Fuzziness + +We can search for terms that are +similar to, but not exactly like our search terms, using the ``fuzzy'' +operator: + + quikc~ brwn~ foks~ + +This uses the +http://en.wikipedia.org/wiki/Damerau-Levenshtein_distance[Damerau-Levenshtein distance] +to find all terms with a maximum of +two changes, where a change is the insertion, deletion +or substitution of a single character, or transposition of two adjacent +characters. + +The default _edit distance_ is `2`, but an edit distance of `1` should be +sufficient to catch 80% of all human misspellings. It can be specified as: + + quikc~1 + +===== Proximity searches + +While a phrase query (eg `"john smith"`) expects all of the terms in exactly +the same order, a proximity query allows the specified words to be further +apart or in a different order. In the same way that fuzzy queries can +specify a maximum edit distance for characters in a word, a proximity search +allows us to specify a maximum edit distance of words in a phrase: + + "fox quick"~5 + +The closer the text in a field is to the original order specified in the +query string, the more relevant that document is considered to be. When +compared to the above example query, the phrase `"quick fox"` would be +considered more relevant than `"quick brown fox"`. + +===== Ranges + +Ranges can be specified for date, numeric or string fields. Inclusive ranges +are specified with square brackets `[min TO max]` and exclusive ranges with +curly brackets `{min TO max}`. + +* All days in 2012: + + date:[2012/01/01 TO 2012/12/31] + +* Numbers 1..5 + + count:[1 TO 5] + +* Tags between `alpha` and `omega`, excluding `alpha` and `omega`: + + tag:{alpha TO omega} + +* Numbers from 10 upwards + + count:[10 TO *] + +* Dates before 2012 + + date:{* TO 2012/01/01} + +Curly and square brackets can be combined: + +* Numbers from 1 up to but not including 5 + + count:[1..5} + + +Ranges with one side unbounded can use the following syntax: + + age:>10 + age:>=10 + age:<10 + age:<=10 + +[NOTE] +=================================================================== +To combine an upper and lower bound with the simplified syntax, you +would need to join two clauses with an `AND` operator: + + age:(>=10 AND < 20) + age:(+>=10 +<20) + +=================================================================== + +The parsing of ranges in query strings can be complex and error prone. It is +much more reliable to use an explicit <<query-dsl-range-filter,`range` filter>>. + + +===== Boosting + +Use the _boost_ operator `^` to make one term more relevant than another. +For instance, if we want to find all documents about foxes, but we are +especially interested in quick foxes: + + quick^2 fox + +The default `boost` value is 1, but can be any positive floating point number. +Boosts between 0 and 1 reduce relevance. + +Boosts can also be applied to phrases or to groups: + + "john smith"^2 (foo bar)^4 + +===== Boolean operators + +By default, all terms are optional, as long as one term matches. A search +for `foo bar baz` will find any document that contains one or more of +`foo` or `bar` or `baz`. We have already discussed the `default_operator` +above which allows you to force all terms to be required, but there are +also _boolean operators_ which can be used in the query string itself +to provide more control. + +The preferred operators are `+` (this term *must* be present) and `-` +(this term *must not* be present). All other terms are optional. +For example, this query: + + quick brown +fox -news + +states that: + +* `fox` must be present +* `news` must not be present +* `quick` and `brown` are optional -- their presence increases the relevance + +The familiar operators `AND`, `OR` and `NOT` (also written `&&`, `||` and `!`) +are also supported. However, the effects of these operators can be more +complicated than is obvious at first glance. `NOT` takes precedence over +`AND`, which takes precedence over `OR`. While the `+` and `-` only affect +the term to the right of the operator, `AND` and `OR` can affect the terms to +the left and right. + +**** +Rewriting the above query using `AND`, `OR` and `NOT` demonstrates the +complexity: + +`quick OR brown AND fox AND NOT news`:: + +This is incorrect, because `brown` is now a required term. + +`(quick OR brown) AND fox AND NOT news`:: + +This is incorrect because at least one of `quick` or `brown` is now required +and the search for those terms would be scored differently from the original +query. + +`((quick AND fox) OR (brown AND fox) OR fox) AND NOT news`:: + +This form now replicates the logic from the original query correctly, but +the relevance scoring bares little resemblance to the original. + +In contrast, the same query rewritten using the <<query-dsl-match-query,`match` query>> +would look like this: + + { + "bool": { + "must": { "match": "fox" }, + "should": { "match": "quick brown" }, + "must_not": { "match": "news" } + } + } + +**** + +===== Grouping + +Multiple terms or clauses can be grouped together with parentheses, to form +sub-queries: + + (quick OR brown) AND fox + +Groups can be used to target a particular field, or to boost the result +of a sub-query: + + status:(active OR pending) title:(full text search)^2 + +===== Reserved characters + +If you need to use any of the characters which function as operators in your +query itself (and not as operators), then you should escape them with +a leading backslash. For instance, to search for `(1+1)=2`, you would +need to write your query as `\(1\+1\)=2`. + +The reserved characters are: `+ - && || ! ( ) { } [ ] ^ " ~ * ? : \ /` + +Failing to escape these special characters correctly could lead to a syntax +error which prevents your query from running. + +.Watch this space +**** +A space may also be a reserved character. For instance, if you have a +synonym list which converts `"wi fi"` to `"wifi"`, a `query_string` search +for `"wi fi"` would fail. The query string parser would interpret your +query as a search for `"wi OR fi"`, while the token stored in your +index is actually `"wifi"`. Escaping the space will protect it from +being touched by the query string parser: `"wi\ fi"`. +**** + +===== Empty Query + +If the query string is empty or only contains whitespaces the +query string is interpreted as a `no_docs_query` and will yield +an empty result set. diff --git a/docs/reference/query-dsl/queries/range-query.asciidoc b/docs/reference/query-dsl/queries/range-query.asciidoc new file mode 100644 index 0000000..cf8a9da --- /dev/null +++ b/docs/reference/query-dsl/queries/range-query.asciidoc @@ -0,0 +1,31 @@ +[[query-dsl-range-query]] +=== Range Query + +Matches documents with fields that have terms within a certain range. +The type of the Lucene query depends on the field type, for `string` +fields, the `TermRangeQuery`, while for number/date fields, the query is +a `NumericRangeQuery`. The following example returns all documents where +`age` is between `10` and `20`: + +[source,js] +-------------------------------------------------- +{ + "range" : { + "age" : { + "gte" : 10, + "lte" : 20, + "boost" : 2.0 + } + } +} +-------------------------------------------------- + +The `range` query accepts the following parameters: + +[horizontal] +`gte`:: Greater-than or equal to +`gt`:: Greater-than +`lte`:: Less-than or equal to +`lt`:: Less-than +`boost`:: Sets the boost value of the query, defaults to `1.0` + diff --git a/docs/reference/query-dsl/queries/regexp-query.asciidoc b/docs/reference/query-dsl/queries/regexp-query.asciidoc new file mode 100644 index 0000000..3345773 --- /dev/null +++ b/docs/reference/query-dsl/queries/regexp-query.asciidoc @@ -0,0 +1,54 @@ +[[query-dsl-regexp-query]] +=== Regexp Query + +The `regexp` query allows you to use regular expression term queries. +See <<regexp-syntax>> for details of the supported regular expression language. + +*Note*: The performance of a `regexp` query heavily depends on the +regular expression chosen. Matching everything like `.*` is very slow as +well as using lookaround regular expressions. If possible, you should +try to use a long prefix before your regular expression starts. Wildcard +matchers like `.*?+` will mostly lower performance. + +[source,js] +-------------------------------------------------- +{ + "regexp":{ + "name.first": "s.*y" + } +} +-------------------------------------------------- + +Boosting is also supported + +[source,js] +-------------------------------------------------- +{ + "regexp":{ + "name.first":{ + "value":"s.*y", + "boost":1.2 + } + } +} +-------------------------------------------------- + +You can also use special flags + +[source,js] +-------------------------------------------------- +{ + "regexp":{ + "name.first": "s.*y", + "flags" : "INTERSECTION|COMPLEMENT|EMPTY" + } +} +-------------------------------------------------- + +Possible flags are `ALL`, `ANYSTRING`, `AUTOMATON`, `COMPLEMENT`, +`EMPTY`, `INTERSECTION`, `INTERVAL`, or `NONE`. Please check the +http://lucene.apache.org/core/4_3_0/core/index.html?org%2Fapache%2Flucene%2Futil%2Fautomaton%2FRegExp.html[Lucene +documentation] for their meaning + + +include::regexp-syntax.asciidoc[] diff --git a/docs/reference/query-dsl/queries/regexp-syntax.asciidoc b/docs/reference/query-dsl/queries/regexp-syntax.asciidoc new file mode 100644 index 0000000..5d2c061 --- /dev/null +++ b/docs/reference/query-dsl/queries/regexp-syntax.asciidoc @@ -0,0 +1,280 @@ +[[regexp-syntax]] +==== Regular expression syntax + +Regular expression queries are supported by the `regexp` and the `query_string` +queries. The Lucene regular expression engine +is not Perl-compatible but supports a smaller range of operators. + +[NOTE] +==== +We will not attempt to explain regular expressions, but +just explain the supported operators. +==== + +===== Standard operators + +Anchoring:: ++ +-- + +Most regular expression engines allow you to match any part of a string. +If you want the regexp pattern to start at the beginning of the string or +finish at the end of the string, then you have to _anchor_ it specifically, +using `^` to indicate the beginning or `$` to indicate the end. + +Lucene's patterns are always anchored. The pattern provided must match +the entire string. For string `"abcde"`: + + ab.* # match + abcd # no match + +-- + +Allowed characters:: ++ +-- + +Any Unicode characters may be used in the pattern, but certain characters +are reserved and must be escaped. The standard reserved characters are: + +.... +. ? + * | { } [ ] ( ) " \ +.... + +If you enable optional features (see below) then these characters may +also be reserved: + + # @ & < > ~ + +Any reserved character can be escaped with a backslash `"\*"` including +a literal backslash character: `"\\"` + +Additionally, any characters (except double quotes) are interpreted literally +when surrounded by double quotes: + + john"@smith.com" + + +-- + +Match any character:: ++ +-- + +The period `"."` can be used to represent any character. For string `"abcde"`: + + ab... # match + a.c.e # match + +-- + +One-or-more:: ++ +-- + +The plus sign `"+"` can be used to repeat the preceding shortest pattern +once or more times. For string `"aaabbb"`: + + a+b+ # match + aa+bb+ # match + a+.+ # match + aa+bbb+ # no match + +-- + +Zero-or-more:: ++ +-- + +The asterisk `"*"` can be used to match the preceding shortest pattern +zero-or-more times. For string `"aaabbb`": + + a*b* # match + a*b*c* # match + .*bbb.* # match + aaa*bbb* # match + +-- + +Zero-or-one:: ++ +-- + +The question mark `"?"` makes the preceding shortest pattern optional. It +matches zero or one times. For string `"aaabbb"`: + + aaa?bbb? # match + aaaa?bbbb? # match + .....?.? # match + aa?bb? # no match + +-- + +Min-to-max:: ++ +-- + +Curly brackets `"{}"` can be used to specify a minimum and (optionally) +a maximum number of times the preceding shortest pattern can repeat. The +allowed forms are: + + {5} # repeat exactly 5 times + {2,5} # repeat at least twice and at most 5 times + {2,} # repeat at least twice + +For string `"aaabbb"`: + + a{3}b{3} # match + a{2,4}b{2,4} # match + a{2,}b{2,} # match + .{3}.{3} # match + a{4}b{4} # no match + a{4,6}b{4,6} # no match + a{4,}b{4,} # no match + +-- + +Grouping:: ++ +-- + +Parentheses `"()"` can be used to form sub-patterns. The quantity operators +listed above operate on the shortest previous pattern, which can be a group. +For string `"ababab"`: + + (ab)+ # match + ab(ab)+ # match + (..)+ # match + (...)+ # no match + (ab)* # match + abab(ab)? # match + ab(ab)? # no match + (ab){3} # match + (ab){1,2} # no match + +-- + +Alternation:: ++ +-- + +The pipe symbol `"|"` acts as an OR operator. The match will succeed if +the pattern on either the left-hand side OR the right-hand side matches. +The alternation applies to the _longest pattern_, not the shortest. +For string `"aabb"`: + + aabb|bbaa # match + aacc|bb # no match + aa(cc|bb) # match + a+|b+ # no match + a+b+|b+a+ # match + a+(b|c)+ # match + +-- + +Character classes:: ++ +-- + +Ranges of potential characters may be represented as character classes +by enclosing them in square brackets `"[]"`. A leading `^` +negates the character class. The allowed forms are: + + [abc] # 'a' or 'b' or 'c' + [a-c] # 'a' or 'b' or 'c' + [-abc] # '-' or 'a' or 'b' or 'c' + [abc\-] # '-' or 'a' or 'b' or 'c' + [^a-c] # any character except 'a' or 'b' or 'c' + [^a-c] # any character except 'a' or 'b' or 'c' + [-abc] # '-' or 'a' or 'b' or 'c' + [abc\-] # '-' or 'a' or 'b' or 'c' + +Note that the dash `"-"` indicates a range of characeters, unless it is +the first character or if it is escaped with a backslash. + +For string `"abcd"`: + + ab[cd]+ # match + [a-d]+ # match + [^a-d]+ # no match + +-- + +===== Optional operators + +These operators are only available when they are explicitly enabled, by +passing `flags` to the query. + +Multiple flags can be enabled either using the `ALL` flag, or by +concatenating flags with a pipe `"|"`: + + { + "regexp": { + "username": { + "value": "john~athon<1-5>", + "flags": "COMPLEMENT|INTERVAL" + } + } + } + +Complement:: ++ +-- + +The complement is probably the most useful option. The shortest pattern that +follows a tilde `"~"` is negated. For the string `"abcdef"`: + + ab~df # match + ab~cf # no match + a~(cd)f # match + a~(bc)f # no match + +Enabled with the `COMPLEMENT` or `ALL` flags. + +-- + +Interval:: ++ +-- + +The interval option enables the use of numeric ranges, enclosed by angle +brackets `"<>"`. For string: `"foo80"`: + + foo<1-100> # match + foo<01-100> # match + foo<001-100> # no match + +Enabled with the `INTERVAL` or `ALL` flags. + + +-- + +Intersection:: ++ +-- + +The ampersand `"&"` joins two patterns in a way that both of them have to +match. For string `"aaabbb"`: + + aaa.+&.+bbb # match + aaa&bbb # no match + +Using this feature usually means that you should rewrite your regular +expression. + +Enabled with the `INTERSECTION` or `ALL` flags. + +-- + +Any string:: ++ +-- + +The at sign `"@"` matches any string in its entirety. This could be combined +with the intersection and complement above to express ``everything except''. +For instance: + + @&~(foo.+) # anything except string beginning with "foo" + +Enabled with the `ANYSTRING` or `ALL` flags. +-- diff --git a/docs/reference/query-dsl/queries/simple-query-string-query.asciidoc b/docs/reference/query-dsl/queries/simple-query-string-query.asciidoc new file mode 100644 index 0000000..a817b23 --- /dev/null +++ b/docs/reference/query-dsl/queries/simple-query-string-query.asciidoc @@ -0,0 +1,100 @@ +[[query-dsl-simple-query-string-query]] +=== Simple Query String Query + +A query that uses the SimpleQueryParser to parse its context. Unlike the +regular `query_string` query, the `simple_query_string` query will never +throw an exception, and discards invalid parts of the query. Here is +an example: + +[source,js] +-------------------------------------------------- +{ + "simple_query_string" : { + "query": "\"fried eggs\" +(eggplant | potato) -frittata", + "analyzer": "snowball", + "fields": ["body^5","_all"], + "default_operator": "and" + } +} +-------------------------------------------------- + +The `simple_query_string` top level parameters include: + +[cols="<,<",options="header",] +|======================================================================= +|Parameter |Description +|`query` |The actual query to be parsed. See below for syntax. + +|`fields` |The fields to perform the parsed query against. Defaults to the +`index.query.default_field` index settings, which in turn defaults to `_all`. + +|`default_operator` |The default operator used if no explicit operator +is specified. For example, with a default operator of `OR`, the query +`capital of Hungary` is translated to `capital OR of OR Hungary`, and +with default operator of `AND`, the same query is translated to +`capital AND of AND Hungary`. The default value is `OR`. + +|`analyzer` |The analyzer used to analyze each term of the query when +creating composite queries. + +|`flags` |Flags specifying which features of the `simple_query_string` to +enable. Defaults to `ALL`. +|======================================================================= + +[float] +==== Simple Query String Syntax +The `simple_query_string` supports the following special characters: + +* `+` signifies AND operation +* `|` signifies OR operation +* `-` negates a single token +* `"` wraps a number of tokens to signify a phrase for searching +* `*` at the end of a term signifies a prefix query +* `(` and `)` signify precedence + +In order to search for any of these special characters, they will need to +be escaped with `\`. + +[float] +==== Default Field +When not explicitly specifying the field to search on in the query +string syntax, the `index.query.default_field` will be used to derive +which field to search on. It defaults to `_all` field. + +So, if `_all` field is disabled, it might make sense to change it to set +a different default field. + +[float] +==== Multi Field +The fields parameter can also include pattern based field names, +allowing to automatically expand to the relevant fields (dynamically +introduced fields included). For example: + +[source,js] +-------------------------------------------------- +{ + "simple_query_string" : { + "fields" : ["content", "name.*^5"], + "query" : "foo bar baz" + } +} +-------------------------------------------------- + +[float] +==== Flags +`simple_query_string` support multiple flags to specify which parsing features +should be enabled. It is specified as a `|`-delimited string with the +`flags` parameter: + +[source,js] +-------------------------------------------------- +{ + "simple_query_string" : { + "query" : "foo | bar & baz*", + "flags" : "OR|AND|PREFIX" + } +} +-------------------------------------------------- + +The available flags are: `ALL`, `NONE`, `AND`, `OR`, `PREFIX`, `PHRASE`, +`PRECEDENCE`, `ESCAPE`, and `WHITESPACE`.
\ No newline at end of file diff --git a/docs/reference/query-dsl/queries/span-first-query.asciidoc b/docs/reference/query-dsl/queries/span-first-query.asciidoc new file mode 100644 index 0000000..74fe7ff --- /dev/null +++ b/docs/reference/query-dsl/queries/span-first-query.asciidoc @@ -0,0 +1,20 @@ +[[query-dsl-span-first-query]] +=== Span First Query + +Matches spans near the beginning of a field. The span first query maps +to Lucene `SpanFirstQuery`. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "span_first" : { + "match" : { + "span_term" : { "user" : "kimchy" } + }, + "end" : 3 + } +} +-------------------------------------------------- + +The `match` clause can be any other span type query. The `end` controls +the maximum end position permitted in a match. diff --git a/docs/reference/query-dsl/queries/span-multi-term-query.asciidoc b/docs/reference/query-dsl/queries/span-multi-term-query.asciidoc new file mode 100644 index 0000000..76985fa --- /dev/null +++ b/docs/reference/query-dsl/queries/span-multi-term-query.asciidoc @@ -0,0 +1,30 @@ +[[query-dsl-span-multi-term-query]] +=== Span Multi Term Query + +The `span_multi` query allows you to wrap a `multi term query` (one of +fuzzy, prefix, term range or regexp query) as a `span query`, so +it can be nested. Example: + +[source,js] +-------------------------------------------------- +{ + "span_multi":{ + "match":{ + "prefix" : { "user" : { "value" : "ki" } } + } + } +} +-------------------------------------------------- + +A boost can also be associated with the query: + +[source,js] +-------------------------------------------------- +{ + "span_multi":{ + "match":{ + "prefix" : { "user" : { "value" : "ki", "boost" : 1.08 } } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/span-near-query.asciidoc b/docs/reference/query-dsl/queries/span-near-query.asciidoc new file mode 100644 index 0000000..39982e2 --- /dev/null +++ b/docs/reference/query-dsl/queries/span-near-query.asciidoc @@ -0,0 +1,27 @@ +[[query-dsl-span-near-query]] +=== Span Near Query + +Matches spans which are near one another. One can specify _slop_, the +maximum number of intervening unmatched positions, as well as whether +matches are required to be in-order. The span near query maps to Lucene +`SpanNearQuery`. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "span_near" : { + "clauses" : [ + { "span_term" : { "field" : "value1" } }, + { "span_term" : { "field" : "value2" } }, + { "span_term" : { "field" : "value3" } } + ], + "slop" : 12, + "in_order" : false, + "collect_payloads" : false + } +} +-------------------------------------------------- + +The `clauses` element is a list of one or more other span type queries +and the `slop` controls the maximum number of intervening unmatched +positions permitted. diff --git a/docs/reference/query-dsl/queries/span-not-query.asciidoc b/docs/reference/query-dsl/queries/span-not-query.asciidoc new file mode 100644 index 0000000..b035720 --- /dev/null +++ b/docs/reference/query-dsl/queries/span-not-query.asciidoc @@ -0,0 +1,24 @@ +[[query-dsl-span-not-query]] +=== Span Not Query + +Removes matches which overlap with another span query. The span not +query maps to Lucene `SpanNotQuery`. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "span_not" : { + "include" : { + "span_term" : { "field1" : "value1" } + }, + "exclude" : { + "span_term" : { "field2" : "value2" } + } + } +} +-------------------------------------------------- + +The `include` and `exclude` clauses can be any span type query. The +`include` clause is the span query whose matches are filtered, and the +`exclude` clause is the span query whose matches must not overlap those +returned. diff --git a/docs/reference/query-dsl/queries/span-or-query.asciidoc b/docs/reference/query-dsl/queries/span-or-query.asciidoc new file mode 100644 index 0000000..72a4ce8 --- /dev/null +++ b/docs/reference/query-dsl/queries/span-or-query.asciidoc @@ -0,0 +1,20 @@ +[[query-dsl-span-or-query]] +=== Span Or Query + +Matches the union of its span clauses. The span or query maps to Lucene +`SpanOrQuery`. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "span_or" : { + "clauses" : [ + { "span_term" : { "field" : "value1" } }, + { "span_term" : { "field" : "value2" } }, + { "span_term" : { "field" : "value3" } } + ] + } +} +-------------------------------------------------- + +The `clauses` element is a list of one or more other span type queries. diff --git a/docs/reference/query-dsl/queries/span-term-query.asciidoc b/docs/reference/query-dsl/queries/span-term-query.asciidoc new file mode 100644 index 0000000..9de86d4 --- /dev/null +++ b/docs/reference/query-dsl/queries/span-term-query.asciidoc @@ -0,0 +1,30 @@ +[[query-dsl-span-term-query]] +=== Span Term Query + +Matches spans containing a term. The span term query maps to Lucene +`SpanTermQuery`. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "span_term" : { "user" : "kimchy" } +} +-------------------------------------------------- + +A boost can also be associated with the query: + +[source,js] +-------------------------------------------------- +{ + "span_term" : { "user" : { "value" : "kimchy", "boost" : 2.0 } } +} +-------------------------------------------------- + +Or : + +[source,js] +-------------------------------------------------- +{ + "span_term" : { "user" : { "term" : "kimchy", "boost" : 2.0 } } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/term-query.asciidoc b/docs/reference/query-dsl/queries/term-query.asciidoc new file mode 100644 index 0000000..cd9537d --- /dev/null +++ b/docs/reference/query-dsl/queries/term-query.asciidoc @@ -0,0 +1,31 @@ +[[query-dsl-term-query]] +=== Term Query + +Matches documents that have fields that contain a term (*not analyzed*). +The term query maps to Lucene `TermQuery`. The following matches +documents where the user field contains the term `kimchy`: + +[source,js] +-------------------------------------------------- +{ + "term" : { "user" : "kimchy" } +} +-------------------------------------------------- + +A boost can also be associated with the query: + +[source,js] +-------------------------------------------------- +{ + "term" : { "user" : { "value" : "kimchy", "boost" : 2.0 } } +} +-------------------------------------------------- + +Or : + +[source,js] +-------------------------------------------------- +{ + "term" : { "user" : { "term" : "kimchy", "boost" : 2.0 } } +} +-------------------------------------------------- diff --git a/docs/reference/query-dsl/queries/terms-query.asciidoc b/docs/reference/query-dsl/queries/terms-query.asciidoc new file mode 100644 index 0000000..a1f62a3 --- /dev/null +++ b/docs/reference/query-dsl/queries/terms-query.asciidoc @@ -0,0 +1,19 @@ +[[query-dsl-terms-query]] +=== Terms Query + +A query that match on any (configurable) of the provided terms. This is +a simpler syntax query for using a `bool` query with several `term` +queries in the `should` clauses. For example: + +[source,js] +-------------------------------------------------- +{ + "terms" : { + "tags" : [ "blue", "pill" ], + "minimum_should_match" : 1 + } +} +-------------------------------------------------- + +The `terms` query is also aliased with `in` as the query name for +simpler usage. diff --git a/docs/reference/query-dsl/queries/top-children-query.asciidoc b/docs/reference/query-dsl/queries/top-children-query.asciidoc new file mode 100644 index 0000000..00c32bf --- /dev/null +++ b/docs/reference/query-dsl/queries/top-children-query.asciidoc @@ -0,0 +1,71 @@ +[[query-dsl-top-children-query]] +=== Top Children Query + +The `top_children` query runs the child query with an estimated hits +size, and out of the hit docs, aggregates it into parent docs. If there +aren't enough parent docs matching the requested from/size search +request, then it is run again with a wider (more hits) search. + +The `top_children` also provide scoring capabilities, with the ability +to specify `max`, `sum` or `avg` as the score type. + +One downside of using the `top_children` is that if there are more child +docs matching the required hits when executing the child query, then the +`total_hits` result of the search response will be incorrect. + +How many hits are asked for in the first child query run is controlled +using the `factor` parameter (defaults to `5`). For example, when asking +for 10 parent docs (with `from` set to 0), then the child query will +execute with 50 hits expected. If not enough parents are found (in our +example 10), and there are still more child docs to query, then the +child search hits are expanded by multiplying by the +`incremental_factor` (defaults to `2`). + +The required parameters are the `query` and `type` (the child type to +execute the query on). Here is an example with all different parameters, +including the default values: + +[source,js] +-------------------------------------------------- +{ + "top_children" : { + "type": "blog_tag", + "query" : { + "term" : { + "tag" : "something" + } + }, + "score" : "max", + "factor" : 5, + "incremental_factor" : 2 + } +} +-------------------------------------------------- + +[float] +==== Scope + +A `_scope` can be defined on the query allowing to run facets on the +same scope name that will work against the child documents. For example: + +[source,js] +-------------------------------------------------- +{ + "top_children" : { + "_scope" : "my_scope", + "type": "blog_tag", + "query" : { + "term" : { + "tag" : "something" + } + } + } +} +-------------------------------------------------- + +[float] +==== Memory Considerations + +With the current implementation, all `_id` values are loaded to memory +(heap) in order to support fast lookups, so make sure there is enough +memory for it. diff --git a/docs/reference/query-dsl/queries/wildcard-query.asciidoc b/docs/reference/query-dsl/queries/wildcard-query.asciidoc new file mode 100644 index 0000000..d72dbec --- /dev/null +++ b/docs/reference/query-dsl/queries/wildcard-query.asciidoc @@ -0,0 +1,39 @@ +[[query-dsl-wildcard-query]] +=== Wildcard Query + +Matches documents that have fields matching a wildcard expression (*not +analyzed*). Supported wildcards are `*`, which matches any character +sequence (including the empty one), and `?`, which matches any single +character. Note this query can be slow, as it needs to iterate over many +terms. In order to prevent extremely slow wildcard queries, a wildcard +term should not start with one of the wildcards `*` or `?`. The wildcard +query maps to Lucene `WildcardQuery`. + +[source,js] +-------------------------------------------------- +{ + "wildcard" : { "user" : "ki*y" } +} +-------------------------------------------------- + +A boost can also be associated with the query: + +[source,js] +-------------------------------------------------- +{ + "wildcard" : { "user" : { "value" : "ki*y", "boost" : 2.0 } } +} +-------------------------------------------------- + +Or : + +[source,js] +-------------------------------------------------- +{ + "wildcard" : { "user" : { "wildcard" : "ki*y", "boost" : 2.0 } } +} +-------------------------------------------------- + +This multi term query allows to control how it gets rewritten using the +<<query-dsl-multi-term-rewrite,rewrite>> +parameter. diff --git a/docs/reference/search.asciidoc b/docs/reference/search.asciidoc new file mode 100644 index 0000000..68df74c --- /dev/null +++ b/docs/reference/search.asciidoc @@ -0,0 +1,101 @@ +[[search]] += Search APIs + +[partintro] +-- + +Most search APIs are <<search-multi-index-type,multi-index, multi-type>>, with the +exception of the <<search-explain>> endpoints. + +[float] +[[search-routing]] +== Routing + +When executing a search, it will be broadcasted to all the index/indices +shards (round robin between replicas). Which shards will be searched on +can be controlled by providing the `routing` parameter. For example, +when indexing tweets, the routing value can be the user name: + +[source,js] +-------------------------------------------------- +$ curl -XPOST 'http://localhost:9200/twitter/tweet?routing=kimchy' -d '{ + "user" : "kimchy", + "postDate" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +} +' +-------------------------------------------------- + +In such a case, if we want to search only on the tweets for a specific +user, we can specify it as the routing, resulting in the search hitting +only the relevant shard: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/tweet/_search?routing=kimchy' -d '{ + "query": { + "filtered" : { + "query" : { + "query_string" : { + "query" : "some query string here" + } + }, + "filter" : { + "term" : { "user" : "kimchy" } + } + } + } +} +' +-------------------------------------------------- + +The routing parameter can be multi valued represented as a comma +separated string. This will result in hitting the relevant shards where +the routing values match to. + +[float] +[[stats-groups]] +== Stats Groups + +A search can be associated with stats groups, which maintains a +statistics aggregation per group. It can later be retrieved using the +<<indices-stats,indices stats>> API +specifically. For example, here is a search body request that associate +the request with two different groups: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "stats" : ["group1", "group2"] +} +-------------------------------------------------- + +-- + +include::search/search.asciidoc[] + +include::search/uri-request.asciidoc[] + +include::search/request-body.asciidoc[] + +include::search/facets.asciidoc[] + +include::search/aggregations.asciidoc[] + +include::search/suggesters.asciidoc[] + +include::search/multi-search.asciidoc[] + +include::search/count.asciidoc[] + +include::search/validate.asciidoc[] + +include::search/explain.asciidoc[] + +include::search/percolate.asciidoc[] + +include::search/more-like-this.asciidoc[] + diff --git a/docs/reference/search/aggregations.asciidoc b/docs/reference/search/aggregations.asciidoc new file mode 100644 index 0000000..cc68059 --- /dev/null +++ b/docs/reference/search/aggregations.asciidoc @@ -0,0 +1,137 @@ +[[search-aggregations]] +== Aggregations + +Aggregations grew out of the <<search-facets, facets>> module and the long experience of how users use it +(and would like to use it) for real-time data analytics purposes. As such, it serves as the next generation +replacement for the functionality we currently refer to as "faceting". + +<<search-facets, Facets>> provide a great way to aggregate data within a document set context. +This context is defined by the executed query in combination with the different levels of filters that can be defined +(filtered queries, top-level filters, and facet level filters). While powerful, their implementation is not designed +from the ground up to support complex aggregations and is thus limited. + +.Are facets deprecated? +********************************** +As the functionality facets offer is a subset of the one offered by aggregations, over time, we would like to +see users move to aggregations for all realtime data analytics. That said, we are well aware that such +transitions/migrations take time, and for this reason we are keeping facets around for the time being. +Facets are not officially deprecated yet but are likely to be in the future. +********************************** + +The aggregations module breaks the barriers the current facet implementation put in place. The new name ("Aggregations") +also indicates the intention here - a generic yet extremely powerful framework for building aggregations - any types of +aggregations. + +An aggregation can be seen as a _unit-of-work_ that builds analytic information over a set of documents. The context of +the execution defines what this document set is (e.g. a top-level aggregation executes within the context of the executed +query/filters of the search request). + +There are many different types of aggregations, each with its own purpose and output. To better understand these types, +it is often easier to break them into two main families: + +_Bucketing_:: + A family of aggregations that build buckets, where each bucket is associated with a _key_ and a document + criterion. When the aggregation is executed, all the buckets criteria are evaluated on every document in + the context and when a criterion matches, the document is considered to "fall in" the relevant bucket. + By the end of the aggregation process, we'll end up with a list of buckets - each one with a set of + documents that "belong" to it. + +_Metric_:: + Aggregations that keep track and compute metrics over a set of documents. + +The interesting part comes next. Since each bucket effectively defines a document set (all documents belonging to +the bucket), one can potentially associate aggregations on the bucket level, and those will execute within the context +of that bucket. This is where the real power of aggregations kicks in: *aggregations can be nested!* + +NOTE: Bucketing aggregations can have sub-aggregations (bucketing or metric). The sub-aggregations will be computed for + the buckets which their parent aggregation generates. There is no hard limit on the level/depth of nested + aggregations (one can nest an aggregation under a "parent" aggregation, which is itself a sub-aggregation of + another higher-level aggregation). + +[float] +=== Structuring Aggregations + +The following snippet captures the basic structure of aggregations: + +[source,js] +-------------------------------------------------- +"aggregations" : { + "<aggregation_name>" : { + "<aggregation_type>" : { + <aggregation_body> + } + [,"aggregations" : { [<sub_aggregation>]+ } ]? + } + [,"<aggregation_name_2>" : { ... } ]* +} +-------------------------------------------------- + +The `aggregations` object (the key `aggs` can also be used) in the JSON holds the aggregations to be computed. Each aggregation +is associated with a logical name that the user defines (e.g. if the aggregation computes the average price, then it would +make sense to name it `avg_price`). These logical names will also be used to uniquely identify the aggregations in the +response. Each aggregation has a specific type (`<aggregation_type>` in the above snippet) and is typically the first +key within the named aggregation body. Each type of aggregation defines its own body, depending on the nature of the +aggregation (e.g. an `avg` aggregation on a specific field will define the field on which the average will be calculated). +At the same level of the aggregation type definition, one can optionally define a set of additional aggregations, +though this only makes sense if the aggregation you defined is of a bucketing nature. In this scenario, the +sub-aggregations you define on the bucketing aggregation level will be computed for all the buckets built by the +bucketing aggregation. For example, if you define a set of aggregations under the `range` aggregation, the +sub-aggregations will be computed for the range buckets that are defined. + +[float] +==== Values Source + +Some aggregations work on values extracted from the aggregated documents. Typically, the values will be extracted from +a specific document field which is set using the `field` key for the aggregations. It is also possible to define a +<<modules-scripting,`script`>> which will generate the values (per document). + +When both `field` and `script` settings are configured for the aggregation, the script will be treated as a +`value script`. While normal scripts are evaluated on a document level (i.e. the script has access to all the data +associated with the document), value scripts are evaluated on the *value* level. In this mode, the values are extracted +from the configured `field` and the `script` is used to apply a "transformation" over these value/s. + +["NOTE",id="aggs-script-note"] +=============================== +When working with scripts, the `lang` and `params` settings can also be defined. The former defines the scripting +language which is used (assuming the proper language is available in Elasticsearch, either by default or as a plugin). The latter +enables defining all the "dynamic" expressions in the script as parameters, which enables the script to keep itself static +between calls (this will ensure the use of the cached compiled scripts in Elasticsearch). +=============================== + +Scripts can generate a single value or multiple values per document. When generating multiple values, one can use the +`script_values_sorted` settings to indicate whether these values are sorted or not. Internally, Elasticsearch can +perform optimizations when dealing with sorted values (for example, with the `min` aggregations, knowing the values are +sorted, Elasticsearch will skip the iterations over all the values and rely on the first value in the list to be the +minimum value among all other values associated with the same document). + +[float] +=== Metrics Aggregations + +The aggregations in this family compute metrics based on values extracted in one way or another from the documents that +are being aggregated. The values are typically extracted from the fields of the document (using the field data), but +can also be generated using scripts. Some aggregations output a single metric (e.g. `avg`) and are called `single-value +metrics aggregation`, others generate multiple metrics (e.g. `stats`) and are called `multi-value metrics aggregation`. +The distinction between single-value and multi-value metrics aggregations plays a role when these aggregations serve as +direct sub-aggregations of some bucket aggregations (some bucket aggregation enable you to sort the returned buckets based +on the metrics in each bucket). + + +[float] +=== Bucket Aggregations + +Bucket aggregations don't calculate metrics over fields like the metrics aggregations do, but instead, they create +buckets of documents. Each bucket is associated with a criteria (depending on the aggregation type) which determines +whether or not a document in the current context "falls" into it. In other words, the buckets effectively define document +sets. In addition to the buckets themselves, the `bucket` aggregations also compute and return the number of documents +that "fell in" to each bucket. + +Bucket aggregations, as opposed to `metrics` aggregations, can hold sub-aggregations. These sub-aggregations will be +aggregated for the buckets created by their "parent" bucket aggregation. + +There are different bucket aggregators, each with a different "bucketing" strategy. Some define a single bucket, some +define fixed number of multiple buckets, and others dynamically create the buckets during the aggregation process. + + +include::aggregations/metrics.asciidoc[] + +include::aggregations/bucket.asciidoc[] diff --git a/docs/reference/search/aggregations/bucket.asciidoc b/docs/reference/search/aggregations/bucket.asciidoc new file mode 100644 index 0000000..6bdd504 --- /dev/null +++ b/docs/reference/search/aggregations/bucket.asciidoc @@ -0,0 +1,25 @@ +[[search-aggregations-bucket]] + +include::bucket/global-aggregation.asciidoc[] + +include::bucket/filter-aggregation.asciidoc[] + +include::bucket/missing-aggregation.asciidoc[] + +include::bucket/nested-aggregation.asciidoc[] + +include::bucket/terms-aggregation.asciidoc[] + +include::bucket/range-aggregation.asciidoc[] + +include::bucket/daterange-aggregation.asciidoc[] + +include::bucket/iprange-aggregation.asciidoc[] + +include::bucket/histogram-aggregation.asciidoc[] + +include::bucket/datehistogram-aggregation.asciidoc[] + +include::bucket/geodistance-aggregation.asciidoc[] + +include::bucket/geohashgrid-aggregation.asciidoc[]
\ No newline at end of file diff --git a/docs/reference/search/aggregations/bucket/datehistogram-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/datehistogram-aggregation.asciidoc new file mode 100644 index 0000000..f48ce4a --- /dev/null +++ b/docs/reference/search/aggregations/bucket/datehistogram-aggregation.asciidoc @@ -0,0 +1,136 @@ +[[search-aggregations-bucket-datehistogram-aggregation]] +=== Date Histogram + +A multi-bucket aggregation similar to the <<search-aggregations-bucket-histogram-aggregation,histogram>> except it can +only be applied on date values. Since dates are represented in elasticsearch internally as long values, it is possible +to use the normal `histogram` on dates as well, though accuracy will be compromised. The reason for this is in the fact +that time based intervals are not fixed (think of leap years and on the number of days in a month). For this reason, +we need a special support for time based data. From a functionality perspective, this histogram supports the same features +as the normal <<search-aggregations-bucket-histogram-aggregation,histogram>>. The main difference is that the interval can be specified by date/time expressions. + +Requesting bucket intervals of a month. + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "articles_over_time" : { + "date_histogram" : { + "field" : "date", + "interval" : "month" + } + } + } +} +-------------------------------------------------- + +fractional values are allowed, for example 1.5 hours: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "articles_over_time" : { + "date_histogram" : { + "field" : "date", + "interval" : "1.5h" + } + } + } +} +-------------------------------------------------- + +Other available expressions for interval: `year`, `quarter`, `week`, `day`, `hour`, `minute`, `second` + +==== Time Zone + +By default, times are stored as UTC milliseconds since the epoch. Thus, all computation and "bucketing" / "rounding" is +done on UTC. It is possible to provide a time zone (both pre rounding, and post rounding) value, which will cause all +computations to take the relevant zone into account. The time returned for each bucket/entry is milliseconds since the +epoch of the provided time zone. + +The parameters are `pre_zone` (pre rounding based on interval) and `post_zone` (post rounding based on interval). The +`time_zone` parameter simply sets the `pre_zone` parameter. By default, those are set to `UTC`. + +The zone value accepts either a numeric value for the hours offset, for example: `"time_zone" : -2`. It also accepts a +format of hours and minutes, like `"time_zone" : "-02:30"`. Another option is to provide a time zone accepted as one of +the values listed here. + +Lets take an example. For `2012-04-01T04:15:30Z`, with a `pre_zone` of `-08:00`. For day interval, the actual time by +applying the time zone and rounding falls under `2012-03-31`, so the returned value will be (in millis) of +`2012-03-31T00:00:00Z` (UTC). For hour interval, applying the time zone results in `2012-03-31T20:15:30`, rounding it +results in `2012-03-31T20:00:00`, but, we want to return it in UTC (`post_zone` is not set), so we convert it back to +UTC: `2012-04-01T04:00:00Z`. Note, we are consistent in the results, returning the rounded value in UTC. + +`post_zone` simply takes the result, and adds the relevant offset. + +Sometimes, we want to apply the same conversion to UTC we did above for hour also for day (and up) intervals. We can +set `pre_zone_adjust_large_interval` to `true`, which will apply the same conversion done for hour interval in the +example, to day and above intervals (it can be set regardless of the interval, but only kick in when using day and +higher intervals). + +==== Factor + +The date histogram works on numeric values (since time is stored in milliseconds since the epoch in UTC). But, +sometimes, systems will store a different resolution (like seconds since UTC) in a numeric field. The `factor` +parameter can be used to change the value in the field to milliseconds to actual do the relevant rounding, and then +be applied again to get to the original unit. For example, when storing in a numeric field seconds resolution, the +factor can be set to 1000. + +==== Pre/Post Offset + +Specific offsets can be provided for pre rounding and post rounding. The `pre_offset` for pre rounding, and +`post_offset` for post rounding. The format is the date time format (`1h`, `1d`, etc...). + +==== Keys + +Since internally, dates are represented as 64bit numbers, these numbers are returned as the bucket keys (each key +representing a date - milliseconds since the epoch). It is also possible to define a date format, which will result in +returning the dates as formatted strings next to the numeric key values: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "articles_over_time" : { + "date_histogram" : { + "field" : "date", + "interval" : "1M", + "format" : "yyyy-MM-dd" <1> + } + } + } +} +-------------------------------------------------- + +<1> Supports expressive date <<date-format-pattern,format pattern>> + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "articles_over_time": { + "buckets": [ + { + "key_as_string": "2013-02-02", + "key": 1328140800000, + "doc_count": 1 + }, + { + "key_as_string": "2013-03-02", + "key": 1330646400000, + "doc_count": 2 + }, + ... + ] + } + } +} +-------------------------------------------------- + +Like with the normal <<search-aggregations-bucket-histogram-aggregation,histogram>>, both document level scripts and +value level scripts are supported. It is also possilbe to control the order of the returned buckets using the `order` +settings and filter the returned buckets based on a `min_doc_count` setting (by defaults to all buckets with +`min_doc_count > 1` will be returned).
\ No newline at end of file diff --git a/docs/reference/search/aggregations/bucket/daterange-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/daterange-aggregation.asciidoc new file mode 100644 index 0000000..710f3ac --- /dev/null +++ b/docs/reference/search/aggregations/bucket/daterange-aggregation.asciidoc @@ -0,0 +1,110 @@ +[[search-aggregations-bucket-daterange-aggregation]] +=== Date Range + +A range aggregation that is dedicated for date values. The main difference between this aggregation and the normal <<search-aggregations-bucket-range-aggregation,range>> aggregation is that the `from` and `to` values can be expressed in Date Math expressions, and it is also possible to specify a date format by which the `from` and `to` response fields will be returned: + +Example: + +[source,js] +-------------------------------------------------- +{ + "aggs": { + "range": { + "date_range": { + "field": "date", + "format": "MM-yyy", + "ranges": [ + { "to": "now-10M/M" }, + { "from": "now-10M/M" } + ] + } + } + } +} +-------------------------------------------------- + +In the example above, we created two range buckets, the first will "bucket" all documents dated prior to 10 months ago and +the second will "bucket" all documents dated since 10 months ago + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "range": { + "buckets": [ + { + "to": 1.3437792E+12, + "to_as_string": "08-2012", + "doc_count": 7 + }, + { + "from": 1.3437792E+12, + "from_as_string": "08-2012", + "doc_count": 2 + } + ] + } + } +} +-------------------------------------------------- + +[[date-format-pattern]] +==== Date Format/Pattern + +NOTE: this information was copied from http://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html[JodaDate] + +All ASCII letters are reserved as format pattern letters, which are defined as follows: + +[options="header"] +|======= +|Symbol |Meaning |Presentation |Examples +|G |era |text |AD +|C |century of era (>=0) |number |20 +|Y |year of era (>=0) |year |1996 + +|x |weekyear |year |1996 +|w |week of weekyear |number |27 +|e |day of week |number |2 +|E |day of week |text |Tuesday; Tue + +|y |year |year |1996 +|D |day of year |number |189 +|M |month of year |month |July; Jul; 07 +|d |day of month |number |10 + +|a |halfday of day |text |PM +|K |hour of halfday (0~11) |number |0 +|h |clockhour of halfday (1~12) |number |12 + +|H |hour of day (0~23) |number |0 +|k |clockhour of day (1~24) |number |24 +|m |minute of hour |number |30 +|s |second of minute |number |55 +|S |fraction of second |number |978 + +|z |time zone |text |Pacific Standard Time; PST +|Z |time zone offset/id |zone |-0800; -08:00; America/Los_Angeles + +|' |escape for text |delimiter +|'' |single quote |literal |' +|======= + +The count of pattern letters determine the format. + +Text:: If the number of pattern letters is 4 or more, the full form is used; otherwise a short or abbreviated form is used if available. + +Number:: The minimum number of digits. Shorter numbers are zero-padded to this amount. + +Year:: Numeric presentation for year and weekyear fields are handled specially. For example, if the count of 'y' is 2, the year will be displayed as the zero-based year of the century, which is two digits. + +Month:: 3 or over, use text, otherwise use number. + +Zone:: 'Z' outputs offset without a colon, 'ZZ' outputs the offset with a colon, 'ZZZ' or more outputs the zone id. + +Zone names:: Time zone names ('z') cannot be parsed. + +Any characters in the pattern that are not in the ranges of ['a'..'z'] and ['A'..'Z'] will be treated as quoted text. For instance, characters like ':', '.', ' ', '#' and '?' will appear in the resulting time text even they are not embraced within single quotes.
\ No newline at end of file diff --git a/docs/reference/search/aggregations/bucket/filter-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/filter-aggregation.asciidoc new file mode 100644 index 0000000..5166002 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/filter-aggregation.asciidoc @@ -0,0 +1,38 @@ +[[search-aggregations-bucket-filter-aggregation]] +=== Filter + +Defines a single bucket of all the documents in the current document set context that match a specified filter. Often this will be used to narrow down the current aggregation context to a specific set of documents. + +Example: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "in_stock_products" : { + "filter" : { "range" : { "stock" : { "gt" : 0 } } }, + "aggs" : { + "avg_price" : { "avg" : { "field" : "price" } } + } + } + } +} +-------------------------------------------------- + +In the above example, we calculate the average price of all the products that are currently in-stock. + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggs" : { + "in_stock_products" : { + "doc_count" : 100, + "avg_price" : { "value" : 56.3 } + } + } +} +--------------------------------------------------
\ No newline at end of file diff --git a/docs/reference/search/aggregations/bucket/geodistance-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/geodistance-aggregation.asciidoc new file mode 100644 index 0000000..db4cd4a --- /dev/null +++ b/docs/reference/search/aggregations/bucket/geodistance-aggregation.asciidoc @@ -0,0 +1,105 @@ +[[search-aggregations-bucket-geodistance-aggregation]] +=== Geo Distance + +A multi-bucket aggregation that works on `geo_point` fields and conceptually works very similar to the <<search-aggregations-bucket-range-aggregation,range>> aggregation. The user can define a point of origin and a set of distance range buckets. The aggregation evaluate the distance of each document value from the origin point and determines the buckets it belongs to based on the ranges (a document belongs to a bucket if the distance between the document and the origin falls within the distance range of the bucket). + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "rings_around_amsterdam" : { + "geo_distance" : { + "field" : "location", + "origin" : "52.3760, 4.894", + "ranges" : [ + { "to" : 100 }, + { "from" : 100, "to" : 300 }, + { "from" : 300 } + ] + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "rings" : { + "buckets": [ + { + "unit": "km", + "to": 100.0, + "doc_count": 3 + }, + { + "unit": "km", + "from": 100.0, + "to": 300.0, + "doc_count": 1 + }, + { + "unit": "km", + "from": 300.0, + "doc_count": 7 + } + ] + } + } +} +-------------------------------------------------- + +The specified field must be of type `geo_point` (which can only be set explicitly in the mappings). And it can also hold an array of `geo_point` fields, in which case all will be taken into account during aggregation. The origin point can accept all formats supported by the `geo_point` <<mapping-geo-point-type,type>>: + +* Object format: `{ "lat" : 52.3760, "lon" : 4.894 }` - this is the safest format as it is the most explicit about the `lat` & `lon` values +* String format: `"52.3760, 4.894"` - where the first number is the `lat` and the second is the `lon` +* Array format: `[4.894, 52.3760]` - which is based on the `GeoJson` standard and where the first number is the `lon` and the second one is the `lat` + +By default, the distance unit is `km` but it can also accept: `mi` (miles), `in` (inch), `yd` (yards), `m` (meters), `cm` (centimeters), `mm` (millimeters). + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "rings" : { + "geo_distance" : { + "field" : "location", + "origin" : "52.3760, 4.894", + "unit" : "mi", <1> + "ranges" : [ + { "to" : 100 }, + { "from" : 100, "to" : 300 }, + { "from" : 300 } + ] + } + } + } +} +-------------------------------------------------- + +<1> The distances will be computed as miles + +There are two distance calculation modes: `sloppy_arc` (the default), `arc` (most accurate) and `plane` (fastest). The `arc` calculation is the most accurate one but also the more expensive one in terms of performance. The `sloppy_arc` is faster but less accurate. The `plane` is the fastest but least accurate distance function. Consider using `plane` when your search context is "narrow" and spans smaller geographical areas (like cities or even countries). `plane` may return higher error mergins for searches across very large areas (e.g. cross continent search). The distance calculation type can be set using the `distance_type` parameter: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "rings" : { + "geo_distance" : { + "field" : "location", + "origin" : "52.3760, 4.894", + "distance_type" : "plane", + "ranges" : [ + { "to" : 100 }, + { "from" : 100, "to" : 300 }, + { "from" : 300 } + ] + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/aggregations/bucket/geohashgrid-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/geohashgrid-aggregation.asciidoc new file mode 100644 index 0000000..3ed2896 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/geohashgrid-aggregation.asciidoc @@ -0,0 +1,127 @@ +[[search-aggregations-bucket-geohashgrid-aggregation]] +=== GeoHash grid + +A multi-bucket aggregation that works on `geo_point` fields and groups points into buckets that represent cells in a grid. +The resulting grid can be sparse and only contains cells that have matching data. Each cell is labeled using a http://en.wikipedia.org/wiki/Geohash[geohash] which is of user-definable precision. + +* High precision geohashes have a long string length and represent cells that cover only a small area. +* Low precision geohashes have a short string length and represent cells that each cover a large area. + +Geohashes used in this aggregation can have a choice of precision between 1 and 12. + +WARNING: The highest-precision geohash of length 12 produces cells that cover less than a square metre of land and so high-precision requests can be very costly in terms of RAM and result sizes. +Please see the example below on how to first filter the aggregation to a smaller geographic area before requesting high-levels of detail. + +The specified field must be of type `geo_point` (which can only be set explicitly in the mappings) and it can also hold an array of `geo_point` fields, in which case all points will be taken into account during aggregation. + + +==== Simple low-precision request + +[source,js] +-------------------------------------------------- +{ + "aggregations" : { + "myLarge-GrainGeoHashGrid" : { + "geohash_grid" : { + "field" : "location", + "precision" : 3 + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "myLarge-GrainGeoHashGrid": { + "buckets": [ + { + "key": "svz", + "doc_count": 10964 + }, + { + "key": "sv8", + "doc_count": 3198 + } + ] + } + } +} +-------------------------------------------------- + + + +==== High-precision requests + +When requesting detailed buckets (typically for displaying a "zoomed in" map) a filter like <<query-dsl-geo-bounding-box-filter,geo_bounding_box>> should be applied to narrow the subject area otherwise potentially millions of buckets will be created and returned. + +[source,js] +-------------------------------------------------- +{ + "aggregations" : { + "zoomedInView" : { + "filter" : { + "geo_bounding_box" : { + "location" : { + "top_left" : "51.73, 0.9", + "bottom_right" : "51.55, 1.1" + } + } + }, + "aggregations":{ + "zoom1":{ + "geohash_grid" : { + "field":"location", + "precision":8, + } + } + } + } + } + } +-------------------------------------------------- + +==== Cell dimensions at the equator +The table below shows the metric dimensions for cells covered by various string lengths of geohash. +Cell dimensions vary with latitude and so the table is for the worst-case scenario at the equator. + +[horizontal] +*GeoHash length*:: *Area width x height* +1:: 5,009.4km x 4,992.6km +2:: 1,252.3km x 624.1km +3:: 156.5km x 156km +4:: 39.1km x 19.5km +5:: 4.9km x 4.9km +6:: 1.2km x 609.4m +7:: 152.9m x 152.4m +8:: 38.2m x 19m +9:: 4.8m x 4.8m +10:: 1.2m x 59.5cm +11:: 14.9cm x 14.9cm +12:: 3.7cm x 1.9cm + + + +==== Options + +[horizontal] +field:: Mandatory. The name of the field indexed with GeoPoints. + +precision:: Optional. The string length of the geohashes used to define + cells/buckets in the results. Defaults to 5. + +size:: Optional. The maximum number of geohash buckets to return + (defaults to 10,000). When results are trimmed, buckets are + prioritised based on the volumes of documents they contain. + +shard_size:: Optional. To allow for more accurate counting of the top cells + returned in the final result the aggregation defaults to + returning `max(10,(size x number-of-shards))` buckets from each + shard. If this heuristic is undesirable, the number considered + from each shard can be over-ridden using this parameter. + + diff --git a/docs/reference/search/aggregations/bucket/global-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/global-aggregation.asciidoc new file mode 100644 index 0000000..da6ddc1 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/global-aggregation.asciidoc @@ -0,0 +1,51 @@ +[[search-aggregations-bucket-global-aggregation]] +=== Global + +Defines a single bucket of all the documents within the search execution context. This context is defined by the indices and the document types you're searching on, but is *not* influenced by the search query itself. + +NOTE: Global aggregators can only be placed as top level aggregators (it makes no sense to embed a global aggregator + within another bucket aggregator) + +Example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match" : { "title" : "shirt" } + }, + "aggs" : { + "all_products" : { + "global" : {}, <1> + "aggs" : { <2> + "avg_price" : { "avg" : { "field" : "price" } } + } + } + } +} +-------------------------------------------------- + +<1> The `global` aggregation has an empty body +<2> The sub-aggregations that are registered for this `global` aggregation + +The above aggregation demonstrates how one would compute aggregations (`avg_price` in this example) on all the documents in the search context, regardless of the query (in our example, it will compute the average price over all products in our catalog, not just on the "shirts"). + +The response for the above aggreation: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations" : { + "all_products" : { + "doc_count" : 100, <1> + "avg_price" : { + "value" : 56.3 + } + } + } +} +-------------------------------------------------- + +<1> The number of documents that were aggregated (in our case, all documents within the search context) diff --git a/docs/reference/search/aggregations/bucket/histogram-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/histogram-aggregation.asciidoc new file mode 100644 index 0000000..469ea23 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/histogram-aggregation.asciidoc @@ -0,0 +1,283 @@ +[[search-aggregations-bucket-histogram-aggregation]] +=== Histogram + +A multi-bucket values source based aggregation that can be applied on numeric values extracted from the documents. +It dynamically builds fixed size (a.k.a. interval) buckets over the values. For example, if the documents have a field +that holds a price (numeric), we can configure this aggregation to dynamically build buckets with interval `5` +(in case of price it may represent $5). When the aggregation executes, the price field of every document will be +evaluated and will be rounded down to its closest bucket - for example, if the price is `32` and the bucket size is `5` +then the rounding will yield `30` and thus the document will "fall" into the bucket that is associated withe the key `30`. +To make this more formal, here is the rounding function that is used: + +[source,java] +-------------------------------------------------- +rem = value % interval +if (rem < 0) { + rem += interval +} +bucket_key = value - rem +-------------------------------------------------- + +The following snippet "buckets" the products based on their `price` by interval of `50`: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "prices" : { + "histogram" : { + "field" : "price", + "interval" : 50 + } + } + } +} +-------------------------------------------------- + +And the following may be the response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "prices" : { + "buckets": [ + { + "key": 0, + "doc_count": 2 + }, + { + "key": 50, + "doc_count": 4 + }, + { + "key": 150, + "doc_count": 3 + } + ] + } + } +} +-------------------------------------------------- + +The response above shows that none of the aggregated products has a price that falls within the range of `[100 - 150)`. +By default, the response will only contain those buckets with a `doc_count` greater than 0. It is possible change that +and request buckets with either a higher minimum count or even 0 (in which case elasticsearch will "fill in the gaps" +and create buckets with zero documents). This can be configured using the `min_doc_count` setting: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "prices" : { + "histogram" : { + "field" : "price", + "interval" : 50, + "min_doc_count" : 0 + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "prices" : { + "buckets": [ + { + "key": 0, + "doc_count": 2 + }, + { + "key": 50, + "doc_count": 4 + }, + { + "key" : 100, + "doc_count" : 0 <1> + }, + { + "key": 150, + "doc_count": 3 + } + ] + } + } +} +-------------------------------------------------- + +<1> No documents were found that belong in this bucket, yet it is still returned with zero `doc_count`. + +==== Order + +By default the returned buckets are sorted by their `key` ascending, though the order behaviour can be controled +using the `order` setting. + +Ordering the buckets by their key - descending: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "prices" : { + "histogram" : { + "field" : "price", + "interval" : 50, + "order" : { "_key" : "desc" } + } + } + } +} +-------------------------------------------------- + +Ordering the buckets by their `doc_count` - ascending: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "prices" : { + "histogram" : { + "field" : "price", + "interval" : 50, + "order" : { "_count" : "asc" } + } + } + } +} +-------------------------------------------------- + +If the histogram aggregation has a direct metrics sub-aggregation, the latter can determine the order of the buckets: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "prices" : { + "histogram" : { + "field" : "price", + "interval" : 50, + "order" : { "price_stats.min" : "asc" } <1> + }, + "aggs" : { + "price_stats" : { "stats" : {} } <2> + } + } + } +} +-------------------------------------------------- + +<1> The `{ "price_stats.min" : asc" }` will sort the buckets based on `min` value of their their `price_stats` sub-aggregation. + +<2> There is no need to configure the `price` field for the `price_stats` aggregation as it will inherit it by default from its parent histogram aggregation. + +==== Minimum document count + +It is possible to only return buckets that have a document count that is greater than or equal to a configured +limit through the `min_doc_count` option. + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "prices" : { + "histogram" : { + "field" : "price", + "interval" : 50, + "min_doc_count": 10 + } + } + } +} +-------------------------------------------------- + +The above aggregation would only return buckets that contain 10 documents or more. Default value is `1`. + +NOTE: The special value `0` can be used to add empty buckets to the response between the minimum and the maximum buckets. +Here is an example of what the response could look like: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "prices": { + "buckets": { + "0": { + "key": 0, + "doc_count": 2 + }, + "50": { + "key": 50, + "doc_count": 0 + }, + "150": { + "key": 150, + "doc_count": 3 + }, + "200": { + "key": 150, + "doc_count": 0 + }, + "250": { + "key": 150, + "doc_count": 0 + }, + "300": { + "key": 150, + "doc_count": 1 + } + } + } + } +} +-------------------------------------------------- + +==== Response Format + +By default, the buckets are returned as an ordered array. It is also possible to request the response as a hash +instead keyed by the buckets keys: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "prices" : { + "histogram" : { + "field" : "price", + "interval" : 50, + "keyed" : true + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "prices": { + "buckets": { + "0": { + "key": 0, + "doc_count": 2 + }, + "50": { + "key": 50, + "doc_count": 4 + }, + "150": { + "key": 150, + "doc_count": 3 + } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/aggregations/bucket/iprange-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/iprange-aggregation.asciidoc new file mode 100644 index 0000000..def09e6 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/iprange-aggregation.asciidoc @@ -0,0 +1,98 @@ +[[search-aggregations-bucket-iprange-aggregation]] +=== IPv4 Range + +Just like the dedicated <<search-aggregations-bucket-daterange-aggregation,date>> range aggregation, there is also a dedicated range aggregation for IPv4 typed fields: + +Example: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "ip_ranges" : { + "ip_range" : { + "field" : "ip", + "ranges" : [ + { "to" : "10.0.0.5" }, + { "from" : "10.0.0.5" } + ] + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "ip_ranges": + "buckets" : [ + { + "to": 167772165, + "to_as_string": "10.0.0.5", + "doc_count": 4 + }, + { + "from": 167772165, + "from_as_string": "10.0.0.5", + "doc_count": 6 + } + ] + } + } +} +-------------------------------------------------- + +IP ranges can also be defined as CIDR masks: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "ip_ranges" : { + "ip_range" : { + "field" : "ip", + "ranges" : [ + { "mask" : "10.0.0.0/25" }, + { "mask" : "10.0.0.127/25" } + ] + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "ip_ranges": { + "buckets": [ + { + "key": "10.0.0.0/25", + "from": 1.6777216E+8, + "from_as_string": "10.0.0.0", + "to": 167772287, + "to_as_string": "10.0.0.127", + "doc_count": 127 + }, + { + "key": "10.0.0.127/25", + "from": 1.6777216E+8, + "from_as_string": "10.0.0.0", + "to": 167772287, + "to_as_string": "10.0.0.127", + "doc_count": 127 + } + ] + } + } +} +--------------------------------------------------
\ No newline at end of file diff --git a/docs/reference/search/aggregations/bucket/missing-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/missing-aggregation.asciidoc new file mode 100644 index 0000000..77526c2 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/missing-aggregation.asciidoc @@ -0,0 +1,34 @@ +[[search-aggregations-bucket-missing-aggregation]] +=== Missing + +A field data based single bucket aggregation, that creates a bucket of all documents in the current document set context that are missing a field value (effectively, missing a field or having the configured NULL value set). This aggregator will often be used in conjunction with other field data bucket aggregators (such as ranges) to return information for all the documents that could not be placed in any of the other buckets due to missing field data values. + +Example: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "products_without_a_price" : { + "missing" : { "field" : "price" } + } + } +} +-------------------------------------------------- + +In the above example, we calculate the average price of all the products that are currently in-stock. + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggs" : { + "products_without_a_price" : { + "doc_count" : 10 + } + } +} +--------------------------------------------------
\ No newline at end of file diff --git a/docs/reference/search/aggregations/bucket/nested-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/nested-aggregation.asciidoc new file mode 100644 index 0000000..cd49f88 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/nested-aggregation.asciidoc @@ -0,0 +1,67 @@ +[[search-aggregations-bucket-nested-aggregation]] +=== Nested + +A special single bucket aggregation that enables aggregating nested documents. + +For example, lets say we have a index of products, and each product holds the list of resellers - each having its own +price for the product. The mapping could look like: + +[source,js] +-------------------------------------------------- +{ + ... + + "product" : { + "properties" : { + "resellers" : { <1> + "type" : "nested" + "properties" : { + "name" : { "type" : "string" }, + "price" : { "type" : "double" } + } + } + } + } +} +-------------------------------------------------- + +<1> The `resellers` is an array that holds nested documents under the `product` object. + +The following aggregations will return the minimum price products can be purchased in: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match" : { "name" : "led tv" } + } + "aggs" : { + "resellers" : { + "nested" : { + "path" : "resellers" + }, + "aggs" : { + "min_price" : { "min" : { "field" : "nested.value" } } + } + } + } +} +-------------------------------------------------- + +As you can see above, the nested aggregation requires the `path` of the nested documents within the top level documents. +Then one can define any type of aggregation over these nested documents. + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "resellers": { + "min_price": { + "value" : 350 + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/aggregations/bucket/range-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/range-aggregation.asciidoc new file mode 100644 index 0000000..41a4dd1 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/range-aggregation.asciidoc @@ -0,0 +1,274 @@ +[[search-aggregations-bucket-range-aggregation]] +=== Range + +A multi-bucket value source based aggregation that enables the user to define a set of ranges - each representing a bucket. During the aggregation process, the values extracted from each document will be checked against each bucket range and "bucket" the relevant/matching document. + +Example: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "price_ranges" : { + "range" : { + "field" : "price", + "ranges" : [ + { "to" : 50 }, + { "from" : 50, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "price_ranges" : { + "buckets": [ + { + "to": 50, + "doc_count": 2 + }, + { + "from": 50, + "to": 100, + "doc_count": 4 + }, + { + "from": 100, + "doc_count": 4 + } + ] + } + } +} +-------------------------------------------------- + +==== Keyed Response + +Setting the `key` flag to `true` will associate a unique string key with each bucket and return the ranges as a hash rather than an array: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "price_ranges" : { + "range" : { + "field" : "price", + "keyed" : true, + "ranges" : [ + { "to" : 50 }, + { "from" : 50, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "price_ranges" : { + "buckets": { + "*-50.0": { + "to": 50, + "doc_count": 2 + }, + "50.0-100.0": { + "from": 50, + "to": 100, + "doc_count": 4 + }, + "100.0-*": { + "from": 100, + "doc_count": 4 + } + } + } + } +} +-------------------------------------------------- + +It is also possible to customize the key for each range: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "price_ranges" : { + "range" : { + "field" : "price", + "keyed" : true, + "ranges" : [ + { "key" : "cheap", "to" : 50 }, + { "key" : "average", "from" : 50, "to" : 100 }, + { "key" : "expensive", "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +==== Script + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "price_ranges" : { + "range" : { + "script" : "doc['price'].value", + "ranges" : [ + { "to" : 50 }, + { "from" : 50, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +==== Value Script + +Lets say the product prices are in USD but we would like to get the price ranges in EURO. We can use value script to convert the prices prior the aggregation (assuming conversion rate of 0.8) + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "price_ranges" : { + "range" : { + "field" : "price", + "script" : "_value * conversion_rate", + "params" : { + "conversion_rate" : 0.8 + }, + "ranges" : [ + { "to" : 35 }, + { "from" : 35, "to" : 70 }, + { "from" : 70 } + ] + } + } + } +} +-------------------------------------------------- + +==== Sub Aggregations + +The following example, not only "bucket" the documents to the different buckets but also computes statistics over the prices in each price range + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "price_ranges" : { + "range" : { + "field" : "price", + "ranges" : [ + { "to" : 50 }, + { "from" : 50, "to" : 100 }, + { "from" : 100 } + ] + }, + "aggs" : { + "price_stats" : { + "stats" : { "field" : "price" } + } + } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + "aggregations": { + "price_ranges" : { + "buckets": [ + { + "to": 50, + "doc_count": 2, + "price_stats": { + "count": 2, + "min": 20, + "max": 47, + "avg": 33.5, + "sum": 67 + } + }, + { + "from": 50, + "to": 100, + "doc_count": 4, + "price_stats": { + "count": 4, + "min": 60, + "max": 98, + "avg": 82.5, + "sum": 330 + } + }, + { + "from": 100, + "doc_count": 4, + "price_stats": { + "count": 4, + "min": 134, + "max": 367, + "avg": 216, + "sum": 864 + } + } + ] + } + } +} +-------------------------------------------------- + +If a sub aggregation is also based on the same value source as the range aggregation (like the `stats` aggregation in the example above) it is possible to leave out the value source definition for it. The following will return the same response as above: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "price_ranges" : { + "range" : { + "field" : "price", + "ranges" : [ + { "to" : 50 }, + { "from" : 50, "to" : 100 }, + { "from" : 100 } + ] + }, + "aggs" : { + "price_stats" : { + "stats" : {} <1> + } + } + } + } +} +-------------------------------------------------- + +<1> We don't need to specify the `price` as we "inherit" it by default from the parent `range` aggregation
\ No newline at end of file diff --git a/docs/reference/search/aggregations/bucket/terms-aggregation.asciidoc b/docs/reference/search/aggregations/bucket/terms-aggregation.asciidoc new file mode 100644 index 0000000..3cc7107 --- /dev/null +++ b/docs/reference/search/aggregations/bucket/terms-aggregation.asciidoc @@ -0,0 +1,294 @@ +[[search-aggregations-bucket-terms-aggregation]] +=== Terms + +A multi-bucket value source based aggregation where buckets are dynamically built - one per unique value. + +Example: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "genders" : { + "terms" : { "field" : "gender" } + } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations" : { + "genders" : { + "buckets" : [ + { + "key" : "male", + "doc_count" : 10 + }, + { + "key" : "female", + "doc_count" : 10 + }, + ] + } + } +} +-------------------------------------------------- + +By default, the `terms` aggregation will return the buckets for the top ten terms ordered by the `doc_count`. One can +change this default behaviour by setting the `size` parameter. + +==== Size & Shard Size + +The `size` parameter can be set to define how many term buckets should be returned out of the overall terms list. By +default, the node coordinating the search process will request each shard to provide its own top `size` term buckets +and once all shards respond, it will reduce the results to the final list that will then be returned to the client. +This means that if the number of unique terms is greater than `size`, the returned list is slightly off and not accurate +(it could be that the term counts are slightly off and it could even be that a term that should have been in the top +size buckets was not returned). + +The higher the requested `size` is, the more accurate the results will be, but also, the more expensive it will be to +compute the final results (both due to bigger priority queues that are managed on a shard level and due to bigger data +transfers between the nodes and the client). + +The `shard_size` parameter can be used to minimize the extra work that comes with bigger requested `size`. When defined, +it will determine how many terms the coordinating node will request from each shard. Once all the shards responded, the +coordinating node will then reduce them to a final result which will be based on the `size` parameter - this way, +one can increase the accuracy of the returned terms and avoid the overhead of streaming a big list of buckets back to +the client. + +NOTE: `shard_size` cannot be smaller than `size` (as it doesn't make much sense). When it is, elasticsearch will + override it and reset it to be equal to `size`. + + +==== Order + +The order of the buckets can be customized by setting the `order` parameter. By default, the buckets are ordered by +their `doc_count` descending. It is also possible to change this behaviour as follows: + +Ordering the buckets by their `doc_count` in an ascending manner: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "genders" : { + "terms" : { + "field" : "gender", + "order" : { "_count" : "asc" } + } + } + } +} +-------------------------------------------------- + +Ordering the buckets alphabetically by their terms in an ascending manner: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "genders" : { + "terms" : { + "field" : "gender", + "order" : { "_term" : "asc" } + } + } + } +} +-------------------------------------------------- + + +Ordering the buckets by single value metrics sub-aggregation (identified by the aggregation name): + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "genders" : { + "terms" : { + "field" : "gender", + "order" : { "avg_height" : "desc" } + }, + "aggs" : { + "avg_height" : { "avg" : { "field" : "height" } } + } + } + } +} +-------------------------------------------------- + +Ordering the buckets by multi value metrics sub-aggregation (identified by the aggregation name): + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "genders" : { + "terms" : { + "field" : "gender", + "order" : { "stats.avg" : "desc" } + }, + "aggs" : { + "height_stats" : { "stats" : { "field" : "height" } } + } + } + } +} +-------------------------------------------------- + +==== Minimum document count + +It is possible to only return terms that match more than a configured number of hits using the `min_doc_count` option: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "tags" : { + "terms" : { + "field" : "tag", + "min_doc_count": 10 + } + } + } +} +-------------------------------------------------- + +The above aggregation would only return tags which have been found in 10 hits or more. Default value is `1`. + +NOTE: Setting `min_doc_count`=`0` will also return buckets for terms that didn't match any hit. However, some of + the returned terms which have a document count of zero might only belong to deleted documents, so there is + no warranty that a `match_all` query would find a positive document count for those terms. + +WARNING: When NOT sorting on `doc_count` descending, high values of `min_doc_count` may return a number of buckets + which is less than `size` because not enough data was gathered from the shards. Missing buckets can be + back by increasing `shard_size`. + +==== Script + +Generating the terms using a script: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "genders" : { + "terms" : { + "script" : "doc['gender'].value" + } + } + } +} +-------------------------------------------------- + +==== Value Script + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "genders" : { + "terms" : { + "field" : "gender", + "script" : "'Gender: ' +_value" + } + } + } +} +-------------------------------------------------- + + +==== Filtering Values + +It is possible to filter the values for which buckets will be created. This can be done using the `include` and +`exclude` parameters which are based on regular expressions. + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "tags" : { + "terms" : { + "field" : "tags", + "include" : ".*sport.*", + "exclude" : "water_.*" + } + } + } +} +-------------------------------------------------- + +In the above example, buckets will be created for all the tags that has the word `sport` in them, except those starting +with `water_` (so the tag `water_sports` will no be aggregated). The `include` regular expression will determine what +values are "allowed" to be aggregated, while the `exclude` determines the values that should not be aggregated. When +both are defined, the `exclude` has precedence, meaning, the `include` is evaluated first and only then the `exclude`. + +The regular expression are based on the Java(TM) http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html[Pattern], +and as such, they it is also possible to pass in flags that will determine how the compiled regular expression will work: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "tags" : { + "terms" : { + "field" : "tags", + "include" : { + "pattern" : ".*sport.*", + "flags" : "CANON_EQ|CASE_INSENSITIVE" <1> + }, + "exclude" : { + "pattern" : "water_.*", + "flags" : "CANON_EQ|CASE_INSENSITIVE" + } + } + } + } +} +-------------------------------------------------- + +<1> the flags are concatenated using the `|` character as a separator + +The possible flags that can be used are: +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#CANON_EQ[`CANON_EQ`], +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#CASE_INSENSITIVE[`CASE_INSENSITIVE`], +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#COMMENTS[`COMMENTS`], +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#DOTALL[`DOTALL`], +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#LITERAL[`LITERAL`], +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#MULTILINE[`MULTILINE`], +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#UNICODE_CASE[`UNICODE_CASE`], +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#UNICODE_CHARACTER_CLASS[`UNICODE_CHARACTER_CLASS`] and +http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#UNIX_LINES[`UNIX_LINES`] + +==== Execution hint + +There are two mechanisms by which terms aggregations can be executed: either by using field values directly in order to aggregate +data per-bucket (`map`), or by using ordinals of the field values instead of the values themselves (`ordinals`). Although the +latter execution mode can be expected to be slightly faster, it is only available for use when the underlying data source exposes +those terms ordinals. Moreover, it may actually be slower if most field values are unique. Elasticsearch tries to have sensible +defaults when it comes to the execution mode that should be used, but in case you know that one execution mode may perform better +than the other one, you have the ability to "hint" it to Elasticsearch: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "tags" : { + "terms" : { + "field" : "tags", + "execution_hint": "map" <1> + } + } + } +} +-------------------------------------------------- + +<1> the possible values are `map` and `ordinals` + +Please note that Elasticsearch will ignore this execution hint if it is not applicable. diff --git a/docs/reference/search/aggregations/metrics.asciidoc b/docs/reference/search/aggregations/metrics.asciidoc new file mode 100644 index 0000000..068fda2 --- /dev/null +++ b/docs/reference/search/aggregations/metrics.asciidoc @@ -0,0 +1,15 @@ +[[search-aggregations-metrics]] + +include::metrics/min-aggregation.asciidoc[] + +include::metrics/max-aggregation.asciidoc[] + +include::metrics/sum-aggregation.asciidoc[] + +include::metrics/avg-aggregation.asciidoc[] + +include::metrics/stats-aggregation.asciidoc[] + +include::metrics/extendedstats-aggregation.asciidoc[] + +include::metrics/valuecount-aggregation.asciidoc[] diff --git a/docs/reference/search/aggregations/metrics/avg-aggregation.asciidoc b/docs/reference/search/aggregations/metrics/avg-aggregation.asciidoc new file mode 100644 index 0000000..e9d72e0 --- /dev/null +++ b/docs/reference/search/aggregations/metrics/avg-aggregation.asciidoc @@ -0,0 +1,73 @@ +[[search-aggregations-metrics-avg-aggregation]] +=== Avg + +A `single-value` metrics aggregation that computes the average of numeric values that are extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents, or be generated by a provided script. + +Assuming the data consists of documents representing exams grades (between 0 and 100) of students + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "avg_grade" : { "avg" : { "field" : "grade" } } + } +} +-------------------------------------------------- + +The above aggregation computes the average grade over all documents. The aggregation type is `avg` and the `field` setting defines the numeric field of the documents the average will be computed on. The above will return the following: + + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "avg_grade": { + "value": 75 + } + } +} +-------------------------------------------------- + +The name of the aggregation (`avg_grade` above) also serves as the key by which the aggregation result can be retrieved from the returned response. + +==== Script + +Computing the average grade based on a script: + +[source,js] +-------------------------------------------------- +{ + ..., + + "aggs" : { + "avg_grade" : { "avg" : { "script" : "doc['grade'].value" } } + } +} +-------------------------------------------------- + +===== Value Script + +It turned out that the exam was way above the level of the students and a grade correction needs to be applied. We can use value script to get the new average: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + ... + + "aggs" : { + "avg_corrected_grade" : { + "avg" : { + "field" : "grade", + "script" : "_value * correction", + "params" : { + "correction" : 1.2 + } + } + } + } + } +} +--------------------------------------------------
\ No newline at end of file diff --git a/docs/reference/search/aggregations/metrics/extendedstats-aggregation.asciidoc b/docs/reference/search/aggregations/metrics/extendedstats-aggregation.asciidoc new file mode 100644 index 0000000..a632f4e --- /dev/null +++ b/docs/reference/search/aggregations/metrics/extendedstats-aggregation.asciidoc @@ -0,0 +1,82 @@ +[[search-aggregations-metrics-extendedstats-aggregation]] +=== Extended Stats + +A `multi-value` metrics aggregation that computes stats over numeric values extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents, or be generated by a provided script. + +The `extended_stats` aggregations is an extended version of the <<search-aggregations-metrics-stats-aggregation,`stats`>> aggregation, where additional metrics are added such as `sum_of_squares`, `variance` and `std_deviation`. + +Assuming the data consists of documents representing exams grades (between 0 and 100) of students + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "grades_stats" : { "extended_stats" : { "field" : "grade" } } + } +} +-------------------------------------------------- + +The above aggregation computes the grades statistics over all documents. The aggregation type is `extended_stats` and the `field` setting defines the numeric field of the documents the stats will be computed on. The above will return the following: + + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "grades_stats": { + "count": 6, + "min": 72, + "max": 117.6, + "avg": 94.2, + "sum": 565.2, + "sum_of_squares": 54551.51999999999, + "variance": 218.2799999999976, + "std_deviation": 14.774302013969987 + } + } +} +-------------------------------------------------- + +The name of the aggregation (`grades_stats` above) also serves as the key by which the aggreagtion result can be retrieved from the returned response. + +==== Script + +Computing the grades stats based on a script: + +[source,js] +-------------------------------------------------- +{ + ..., + + "aggs" : { + "grades_stats" : { "extended_stats" : { "script" : "doc['grade'].value" } } + } +} +-------------------------------------------------- + +===== Value Script + +It turned out that the exam was way above the level of the students and a grade correction needs to be applied. We can use value script to get the new stats: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + ... + + "aggs" : { + "grades_stats" : { + "extended_stats" : { + "field" : "grade", + "script" : "_value * correction", + "params" : { + "correction" : 1.2 + } + } + } + } + } +} +--------------------------------------------------
\ No newline at end of file diff --git a/docs/reference/search/aggregations/metrics/max-aggregation.asciidoc b/docs/reference/search/aggregations/metrics/max-aggregation.asciidoc new file mode 100644 index 0000000..17b801e --- /dev/null +++ b/docs/reference/search/aggregations/metrics/max-aggregation.asciidoc @@ -0,0 +1,68 @@ +[[search-aggregations-metrics-max-aggregation]] +=== Max + +A `single-value` metrics aggregation that keeps track and returns the maximum value among the numeric values extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents, or be generated by a provided script. + +Computing the max price value across all documents + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "max_price" : { "max" : { "field" : "price" } } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "max_price": { + "value": 35 + } + } +} +-------------------------------------------------- + +As can be seen, the name of the aggregation (`max_price` above) also serves as the key by which the aggregation result can be retrieved from the returned response. + +==== Script + +Computing the max price value across all document, this time using a script: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "max_price" : { "max" : { "script" : "doc['price'].value" } } + } +} +-------------------------------------------------- + + +==== Value Script + +Let's say that the prices of the documents in our index are in USD, but we would like to compute the max in EURO (and for the sake of this example, lets say the conversion rate is 1.2). We can use a value script to apply the conversion rate to every value before it is aggregated: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "max_price_in_euros" : { + "max" : { + "field" : "price", + "script" : "_value * conversion_rate", + "params" : { + "conversion_rate" : 1.2 + } + } + } + } +} +-------------------------------------------------- + diff --git a/docs/reference/search/aggregations/metrics/min-aggregation.asciidoc b/docs/reference/search/aggregations/metrics/min-aggregation.asciidoc new file mode 100644 index 0000000..d1cf0e3 --- /dev/null +++ b/docs/reference/search/aggregations/metrics/min-aggregation.asciidoc @@ -0,0 +1,67 @@ +[[search-aggregations-metrics-min-aggregation]] +=== Min + +A `single-value` metrics aggregation that keeps track and returns the minimum value among numeric values extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents, or be generated by a provided script. + +Computing the min price value across all documents: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "min_price" : { "min" : { "field" : "price" } } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "min_price": { + "value": 10 + } + } +} +-------------------------------------------------- + +As can be seen, the name of the aggregation (`min_price` above) also serves as the key by which the aggreagtion result can be retrieved from the returned response. + +==== Script + +Computing the min price value across all document, this time using a script: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "min_price" : { "min" : { "script" : "doc['price'].value" } } + } +} +-------------------------------------------------- + + +==== Value Script + +Let's say that the prices of the documents in our index are in USD, but we would like to compute the min in EURO (and for the sake of this example, lets say the conversion rate is 1.2). We can use a value script to apply the conversion rate to every value before it is aggregated: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "min_price_in_euros" : { + "min" : { + "field" : "price", + "script" : "_value * conversion_rate", + "params" : { + "conversion_rate" : 1.2 + } + } + } + } +} +--------------------------------------------------
\ No newline at end of file diff --git a/docs/reference/search/aggregations/metrics/stats-aggregation.asciidoc b/docs/reference/search/aggregations/metrics/stats-aggregation.asciidoc new file mode 100644 index 0000000..940c113 --- /dev/null +++ b/docs/reference/search/aggregations/metrics/stats-aggregation.asciidoc @@ -0,0 +1,79 @@ +[[search-aggregations-metrics-stats-aggregation]] +=== Stats + +A `multi-value` metrics aggregation that computes stats over numeric values extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents, or be generated by a provided script. + +The stats that are returned consist of: `min`, `max`, `sum`, `count` and `avg`. + +Assuming the data consists of documents representing exams grades (between 0 and 100) of students + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "grades_stats" : { "stats" : { "field" : "grade" } } + } +} +-------------------------------------------------- + +The above aggregation computes the grades statistics over all documents. The aggregation type is `stats` and the `field` setting defines the numeric field of the documents the stats will be computed on. The above will return the following: + + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "grades_stats": { + "count": 6, + "min": 60, + "max": 98, + "avg": 78.5, + "sum": 471 + } + } +} +-------------------------------------------------- + +The name of the aggregation (`grades_stats` above) also serves as the key by which the aggregation result can be retrieved from the returned response. + +==== Script + +Computing the grades stats based on a script: + +[source,js] +-------------------------------------------------- +{ + ..., + + "aggs" : { + "grades_stats" : { "stats" : { "script" : "doc['grade'].value" } } + } +} +-------------------------------------------------- + +===== Value Script + +It turned out that the exam was way above the level of the students and a grade correction needs to be applied. We can use a value script to get the new stats: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + ... + + "aggs" : { + "grades_stats" : { + "stats" : { + "field" : "grade", + "script" : "_value * correction", + "params" : { + "correction" : 1.2 + } + } + } + } + } +} +--------------------------------------------------
\ No newline at end of file diff --git a/docs/reference/search/aggregations/metrics/sum-aggregation.asciidoc b/docs/reference/search/aggregations/metrics/sum-aggregation.asciidoc new file mode 100644 index 0000000..69575f5 --- /dev/null +++ b/docs/reference/search/aggregations/metrics/sum-aggregation.asciidoc @@ -0,0 +1,77 @@ +[[search-aggregations-metrics-sum-aggregation]] +=== Sum + +A `single-value` metrics aggregation that sums up numeric values that are extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents, or be generated by a provided script. + +Assuming the data consists of documents representing stock ticks, where each tick holds the change in the stock price from the previous tick. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "filtered" : { + "query" : { "match_all" : {}}, + "filter" : { + "range" : { "timestamp" : { "from" : "now/1d+9.5h", "to" : "now/1d+16h" }} + } + } + }, + "aggs" : { + "intraday_return" : { "sum" : { "field" : "change" } } + } +} +-------------------------------------------------- + +The above aggregation sums up all changes in the today's trading stock ticks which accounts for the intraday return. The aggregation type is `sum` and the `field` setting defines the numeric field of the documents of which values will be summed up. The above will return the following: + + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "intraday_return": { + "value": 2.18 + } + } +} +-------------------------------------------------- + +The name of the aggregation (`intraday_return` above) also serves as the key by which the aggregation result can be retrieved from the returned response. + +==== Script + +Computing the intraday return based on a script: + +[source,js] +-------------------------------------------------- +{ + ..., + + "aggs" : { + "intraday_return" : { "sum" : { "script" : "doc['change'].value" } } + } +} +-------------------------------------------------- + +===== Value Script + +Computing the sum of squares over all stock tick changes: + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + ... + + "aggs" : { + "daytime_return" : { + "sum" : { + "field" : "change", + "script" : "_value * _value" } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/aggregations/metrics/valuecount-aggregation.asciidoc b/docs/reference/search/aggregations/metrics/valuecount-aggregation.asciidoc new file mode 100644 index 0000000..b3f6bf4 --- /dev/null +++ b/docs/reference/search/aggregations/metrics/valuecount-aggregation.asciidoc @@ -0,0 +1,35 @@ +[[search-aggregations-metrics-valuecount-aggregation]] +=== Value Count + +A `single-value` metrics aggregation that counts the number of values that are extracted from the aggregated documents. +These values can be extracted either from specific fields in the documents. Typically, +this aggregator will be used in conjunction with other single-value aggregations. For example, when computing the `avg` +one might be interested in the number of values the average is computed over. + +[source,js] +-------------------------------------------------- +{ + "aggs" : { + "grades_count" : { "value_count" : { "field" : "grade" } } + } +} +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... + + "aggregations": { + "grades_count": { + "value": 10 + } + } +} +-------------------------------------------------- + +The name of the aggregation (`grades_count` above) also serves as the key by which the aggregation result can be +retrieved from the returned response. + diff --git a/docs/reference/search/count.asciidoc b/docs/reference/search/count.asciidoc new file mode 100644 index 0000000..a7036c1 --- /dev/null +++ b/docs/reference/search/count.asciidoc @@ -0,0 +1,89 @@ +[[search-count]] +== Count API + +The count API allows to easily execute a query and get the number of +matches for that query. It can be executed across one or more indices +and across one or more types. The query can either be provided using a +simple query string as a parameter, or using the +<<query-dsl,Query DSL>> defined within the request +body. Here is an example: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/tweet/_count?q=user:kimchy' + +$ curl -XGET 'http://localhost:9200/twitter/tweet/_count' -d ' +{ + "query" : { + "term" : { "user" : "kimchy" } + } +}' +-------------------------------------------------- + +NOTE: The query being sent in the body must be nested in a `query` key, same as +the <<search-search,search api>> works added[1.0.0.RC1,The query was previously the top-level object]. + +Both examples above do the same thing, which is count the number of +tweets from the twitter index for a certain user. The result is: + +[source,js] +-------------------------------------------------- +{ + "count" : 1, + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0 + } +} +-------------------------------------------------- + +The query is optional, and when not provided, it will use `match_all` to +count all the docs. + +[float] +=== Multi index, Multi type + +The count API can be applied to <<search-multi-index-type,multiple types in multiple indices>>. + +[float] +=== Request Parameters + +When executing count using the query parameter `q`, the query passed is +a query string using Lucene query parser. There are additional +parameters that can be passed: + +[cols="<,<",options="header",] +|======================================================================= +|Name |Description +|df |The default field to use when no field prefix is defined within the +query. + +|analyzer |The analyzer name to be used when analyzing the query string. + +|default_operator |The default operator to be used, can be `AND` or +`OR`. Defaults to `OR`. +|======================================================================= + +[float] +=== Request Body + +The count can use the <<query-dsl,Query DSL>> within +its body in order to express the query that should be executed. The body +content can also be passed as a REST parameter named `source`. + +Both HTTP GET and HTTP POST can be used to execute count with body. +Since not all clients support GET with body, POST is allowed as well. + +[float] +=== Distributed + +The count operation is broadcast across all shards. For each shard id +group, a replica is chosen and executed against it. This means that +replicas increase the scalability of count. + +[float] +=== Routing + +The routing value (a comma separated list of the routing values) can be +specified to control which shards the count request will be executed on. diff --git a/docs/reference/search/explain.asciidoc b/docs/reference/search/explain.asciidoc new file mode 100644 index 0000000..7c674af --- /dev/null +++ b/docs/reference/search/explain.asciidoc @@ -0,0 +1,112 @@ +[[search-explain]] +== Explain API + +The explain api computes a score explanation for a query and a specific +document. This can give useful feedback whether a document matches or +didn't match a specific query. + +The `index` and `type` parameters expect a single index and a single +type respectively. + +[float] +=== Usage + +Full query example: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/twitter/tweet/1/_explain' -d '{ + "query" : { + "term" : { "message" : "search" } + } +}' +-------------------------------------------------- + +This will yield the following result: + +[source,js] +-------------------------------------------------- +{ + "matches" : true, + "explanation" : { + "value" : 0.15342641, + "description" : "fieldWeight(message:search in 0), product of:", + "details" : [ { + "value" : 1.0, + "description" : "tf(termFreq(message:search)=1)" + }, { + "value" : 0.30685282, + "description" : "idf(docFreq=1, maxDocs=1)" + }, { + "value" : 0.5, + "description" : "fieldNorm(field=message, doc=0)" + } ] + } +} +-------------------------------------------------- + +There is also a simpler way of specifying the query via the `q` +parameter. The specified `q` parameter value is then parsed as if the +`query_string` query was used. Example usage of the `q` parameter in the +explain api: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/twitter/tweet/1/_explain?q=message:search' +-------------------------------------------------- + +This will yield the same result as the previous request. + +[float] +=== All parameters: + +[horizontal] +`_source`:: + + added[1.0.0.Beta1] Set to `true` to retrieve the `_source` of the document explained. You can also + retrieve part of the document by using `_source_include` & `_source_exclude` (see <<get-source-filtering,Get API>> for more details) + +`fields`:: + Allows to control which stored fields to return as part of the + document explained. + +`routing`:: + Controls the routing in the case the routing was used + during indexing. + +`parent`:: + Same effect as setting the routing parameter. + +`preference`:: + Controls on which shard the explain is executed. + +`source`:: + Allows the data of the request to be put in the query + string of the url. + +`q`:: + The query string (maps to the query_string query). + +`df`:: + The default field to use when no field prefix is defined within + the query. Defaults to _all field. + +`analyzer`:: + The analyzer name to be used when analyzing the query + string. Defaults to the analyzer of the _all field. + +`analyze_wildcard`:: + Should wildcard and prefix queries be analyzed or + not. Defaults to false. + +`lowercase_expanded_terms`:: + Should terms be automatically lowercased + or not. Defaults to true. + +`lenient`:: + If set to true will cause format based failures (like + providing text to a numeric field) to be ignored. Defaults to false. + +`default_operator`:: + The default operator to be used, can be AND or + OR. Defaults to OR. diff --git a/docs/reference/search/facets.asciidoc b/docs/reference/search/facets.asciidoc new file mode 100644 index 0000000..a6529a4 --- /dev/null +++ b/docs/reference/search/facets.asciidoc @@ -0,0 +1,283 @@ +[[search-facets]] +== Facets + +The usual purpose of a full-text search engine is to return a small +number of documents matching your query. + +_Facets_ provide aggregated data based on a search query. In the +simplest case, a +<<search-facets-terms-facet,terms facet>> +can return _facet counts_ for various _facet values_ for a specific +_field_. Elasticsearch supports more facet implementations, such as +<<search-facets-statistical-facet,statistical>> +or +<<search-facets-date-histogram-facet,date +histogram>> facets. + +The field used for facet calculations _must_ be of type numeric, +date/time or be analyzed as a single token — see the +<<mapping,_Mapping_>> guide for details on the +analysis process. + +You can give the facet a custom _name_ and return multiple facets in one +request. + +Let's try it out with a simple example. Suppose we have a number of +articles with a field called `tags`, preferably analyzed with the +<<analysis-keyword-analyzer,keyword>> +analyzer. The facet aggregation will return counts for the most popular +tags across the documents matching your query — or across all documents +in the index. + +We will store some example data first: + +[source,js] +-------------------------------------------------- +curl -X DELETE "http://localhost:9200/articles" +curl -X POST "http://localhost:9200/articles/article" -d '{"title" : "One", "tags" : ["foo"]}' +curl -X POST "http://localhost:9200/articles/article" -d '{"title" : "Two", "tags" : ["foo", "bar"]}' +curl -X POST "http://localhost:9200/articles/article" -d '{"title" : "Three", "tags" : ["foo", "bar", "baz"]}' +-------------------------------------------------- + +Now, let's query the index for articles beginning with letter `T` +and retrieve a +<<search-facets-terms-facet,_terms facet_>> +for the `tags` field. We will name the facet simply: _tags_. + +[source,js] +-------------------------------------------------- +curl -X POST "http://localhost:9200/articles/_search?pretty=true" -d ' + { + "query" : { "query_string" : {"query" : "T*"} }, + "facets" : { + "tags" : { "terms" : {"field" : "tags"} } + } + } +' +-------------------------------------------------- + +This request will return articles `Two` and `Three` (because +they match our query), as well as the `tags` facet: + +[source,js] +-------------------------------------------------- +"facets" : { + "tags" : { + "_type" : "terms", + "missing" : 0, + "total": 5, + "other": 0, + "terms" : [ { + "term" : "foo", + "count" : 2 + }, { + "term" : "bar", + "count" : 2 + }, { + "term" : "baz", + "count" : 1 + } ] + } +} +-------------------------------------------------- + +In the `terms` array, relevant _terms_ and _counts_ are returned. You'll +probably want to display these to your users. The facet returns several +important counts: + +* `missing` : The number of documents which have no value for the +faceted field + + * `total` : The total number of terms in the facet + + * `other` : The number of terms not included in the returned facet +(effectively `other` = `total` - `terms` ) + +Notice, that the counts are scoped to the current query: _foo_ is +counted only twice (not three times), _bar_ is counted twice and _baz_ +once. Also note that terms are counted once per document, even if the +occur more frequently in that document. + +That's because the primary purpose of facets is to enable +http://en.wikipedia.org/wiki/Faceted_search[_faceted navigation_], +allowing the user to refine her query based on the insight from the +facet, i.e. restrict the search to a specific category, price or date +range. Facets can be used, however, for other purposes: computing +histograms, statistical aggregations, and more. See the blog about +link:/blog/data-visualization-with-elasticsearch-and-protovis/[data visualization].for inspiration. + + + +[float] +=== Scope + +As we have already mentioned, facet computation is restricted to the +scope of the current query, called `main`, by default. Facets can be +computed within the `global` scope as well, in which case it will return +values computed across all documents in the index: + +[source,js] +-------------------------------------------------- +{ + "facets" : { + "my_facets" : { + "terms" : { ... }, + "global" : true <1> + } + } +} +-------------------------------------------------- +<1> The `global` keyword can be used with any facet type. + +There's one *important distinction* to keep in mind. While search +_queries_ restrict both the returned documents and facet counts, search +_filters_ restrict only returned documents — but _not_ facet counts. + +If you need to restrict both the documents and facets, and you're not +willing or able to use a query, you may use a _facet filter_. + +[float] +=== Facet Filter + +All facets can be configured with an additional filter (explained in the +<<query-dsl,Query DSL>> section), which _will_ reduce +the documents they use for computing results. An example with a _term_ +filter: + +[source,js] +-------------------------------------------------- +{ + "facets" : { + "<FACET NAME>" : { + "<FACET TYPE>" : { + ... + }, + "facet_filter" : { + "term" : { "user" : "kimchy"} + } + } + } +} +-------------------------------------------------- + +Note that this is different from a facet of the +<<search-facets-filter-facet,filter>> type. + +[float] +=== Facets with the _nested_ types + +<<mapping-nested-type,Nested>> mapping allows +for better support for "inner" documents faceting, especially when it +comes to multi valued key and value facets (like histograms, or term +stats). + +What is it good for? First of all, this is the only way to use facets on +nested documents once they are used (possibly for other reasons). But, +there is also facet specific reason why nested documents can be used, +and that's the fact that facets working on different key and value field +(like term_stats, or histogram) can now support cases where both are +multi valued properly. + +For example, let's use the following mapping: + +[source,js] +-------------------------------------------------- +{ + "type1" : { + "properties" : { + "obj1" : { + "type" : "nested" + } + } + } +} +-------------------------------------------------- + +And, here is a sample data: + +[source,js] +-------------------------------------------------- +{ + "obj1" : [ + { + "name" : "blue", + "count" : 4 + }, + { + "name" : "green", + "count" : 6 + } + ] +} +-------------------------------------------------- + + +[float] +==== All Nested Matching Root Documents + +Another option is to run the facet on all the nested documents matching +the root objects that the main query will end up producing. For example: + +[source,js] +-------------------------------------------------- +{ + "query": { + "match_all": {} + }, + "facets": { + "facet1": { + "terms_stats": { + "key_field" : "name", + "value_field": "count" + }, + "nested": "obj1" + } + } +} +-------------------------------------------------- + +The `nested` element provides the path to the nested document (can be a +multi level nested docs) that will be used. + +Facet filter allows you to filter your facet on the nested object level. +It is important that these filters match on the nested object level and +not on the root document level. In the following example the +`terms_stats` only applies on nested objects with the name 'blue'. + +[source,js] +-------------------------------------------------- +{ + "query": { + "match_all": {} + }, + "facets": { + "facet1": { + "terms_stats": { + "key_field" : "name", + "value_field": "count" + }, + "nested": "obj1", + "facet_filter" : { + "term" : {"name" : "blue"} + } + } + } +} +-------------------------------------------------- + +include::facets/terms-facet.asciidoc[] + +include::facets/range-facet.asciidoc[] + +include::facets/histogram-facet.asciidoc[] + +include::facets/date-histogram-facet.asciidoc[] + +include::facets/filter-facet.asciidoc[] + +include::facets/query-facet.asciidoc[] + +include::facets/statistical-facet.asciidoc[] + +include::facets/terms-stats-facet.asciidoc[] + +include::facets/geo-distance-facet.asciidoc[] + diff --git a/docs/reference/search/facets/date-histogram-facet.asciidoc b/docs/reference/search/facets/date-histogram-facet.asciidoc new file mode 100644 index 0000000..d92c0b2 --- /dev/null +++ b/docs/reference/search/facets/date-histogram-facet.asciidoc @@ -0,0 +1,134 @@ +[[search-facets-date-histogram-facet]] +=== Date Histogram Facet + +A specific histogram facet that can work with `date` field types +enhancing it over the regular +<<search-facets-histogram-facet,histogram +facet>>. Here is a quick example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "date_histogram" : { + "field" : "field_name", + "interval" : "day" + } + } + } +} +-------------------------------------------------- + +==== Interval + +The `interval` allows to set the interval at which buckets will be +created for each hit. It allows for the constant values of `year`, +`quarter`, `month`, `week`, `day`, `hour`, `minute`. + +It also support time setting like `1.5h` (up to `w` for weeks). + +==== Time Zone + +By default, times are stored as UTC milliseconds since the epoch. Thus, +all computation and "bucketing" / "rounding" is done on UTC. It is +possible to provide a time zone (both pre rounding, and post rounding) +value, which will cause all computations to take the relevant zone into +account. The time returned for each bucket/entry is milliseconds since +the epoch of the provided time zone. + +The parameters are `pre_zone` (pre rounding based on interval) and +`post_zone` (post rounding based on interval). The `time_zone` parameter +simply sets the `pre_zone` parameter. By default, those are set to +`UTC`. + +The zone value accepts either a numeric value for the hours offset, for +example: `"time_zone" : -2`. It also accepts a format of hours and +minutes, like `"time_zone" : "-02:30"`. Another option is to provide a +time zone accepted as one of the values listed +http://joda-time.sourceforge.net/timezones.html[here]. + +Lets take an example. For `2012-04-01T04:15:30Z`, with a `pre_zone` of +`-08:00`. For `day` interval, the actual time by applying the time zone +and rounding falls under `2012-03-31`, so the returned value will be (in +millis) of `2012-03-31T00:00:00Z` (UTC). For `hour` interval, applying +the time zone results in `2012-03-31T20:15:30`, rounding it results in +`2012-03-31T20:00:00`, but, we want to return it in UTC (`post_zone` is +not set), so we convert it back to UTC: `2012-04-01T04:00:00Z`. Note, we +are consistent in the results, returning the rounded value in UTC. + +`post_zone` simply takes the result, and adds the relevant offset. + +Sometimes, we want to apply the same conversion to UTC we did above for +`hour` also for `day` (and up) intervals. We can set +`pre_zone_adjust_large_interval` to `true`, which will apply the same +conversion done for `hour` interval in the example, to `day` and above +intervals (it can be set regardless of the interval, but only kick in +when using `day` and higher intervals). + +==== Factor + +The date histogram works on numeric values (since time is stored in +milliseconds since the epoch in UTC). But, sometimes, systems will store +a different resolution (like seconds since UTC) in a numeric field. The +`factor` parameter can be used to change the value in the field to +milliseconds to actual do the relevant rounding, and then be applied +again to get to the original unit. For example, when storing in a +numeric field seconds resolution, the `factor` can be set to `1000`. + +==== Pre / Post Offset + +Specific offsets can be provided for pre rounding and post rounding. The +`pre_offset` for pre rounding, and `post_offset` for post rounding. The +format is the date time format (`1h`, `1d`, ...). + +==== Value Field + +The date_histogram facet allows to use a different key (of type date) +which controls the bucketing, with a different value field which will +then return the total and mean for that field values of the hits within +the relevant bucket. For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "date_histogram" : { + "key_field" : "timestamp", + "value_field" : "price", + "interval" : "day" + } + } + } +} +-------------------------------------------------- + +==== Script Value Field + +A script can be used to compute the value that will then be used to +compute the total and mean for a bucket. For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "date_histogram" : { + "key_field" : "timestamp", + "value_script" : "doc['price'].value * 2", + "interval" : "day" + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/facets/filter-facet.asciidoc b/docs/reference/search/facets/filter-facet.asciidoc new file mode 100644 index 0000000..74dece4 --- /dev/null +++ b/docs/reference/search/facets/filter-facet.asciidoc @@ -0,0 +1,24 @@ +[[search-facets-filter-facet]] +=== Filter Facets + +A filter facet (not to be confused with a +<<search-facets,facet filter>>) allows you to +return a count of the hits matching the filter. The filter itself can be +expressed using the <<query-dsl,Query DSL>>. For +example: + +[source,js] +-------------------------------------------------- +{ + "facets" : { + "wow_facet" : { + "filter" : { + "term" : { "tag" : "wow" } + } + } + } +} +-------------------------------------------------- + +Note, filter facet filters are faster than query facet when using native +filters (non query wrapper ones). diff --git a/docs/reference/search/facets/geo-distance-facet.asciidoc b/docs/reference/search/facets/geo-distance-facet.asciidoc new file mode 100644 index 0000000..e56f4bd --- /dev/null +++ b/docs/reference/search/facets/geo-distance-facet.asciidoc @@ -0,0 +1,252 @@ +[[search-facets-geo-distance-facet]] +=== Geo Distance Facets + +The geo_distance facet is a facet providing information for ranges of +distances from a provided geo_point including count of the number of +hits that fall within each range, and aggregation information (like +total). + +Assuming the following sample doc: + +[source,js] +-------------------------------------------------- +{ + "pin" : { + "location" : { + "lat" : 40.12, + "lon" : -71.34 + } + } +} +-------------------------------------------------- + +Here is an example that create a `geo_distance` facet from a +`pin.location` of 40,-70, and a set of ranges: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "geo1" : { + "geo_distance" : { + "pin.location" : { + "lat" : 40, + "lon" : -70 + }, + "ranges" : [ + { "to" : 10 }, + { "from" : 10, "to" : 20 }, + { "from" : 20, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +==== Accepted Formats + +In much the same way the geo_point type can accept different +representation of the geo point, the filter can accept it as well: + +===== Lat Lon As Properties + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "geo1" : { + "geo_distance" : { + "pin.location" : { + "lat" : 40, + "lon" : -70 + }, + "ranges" : [ + { "to" : 10 }, + { "from" : 10, "to" : 20 }, + { "from" : 20, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +===== Lat Lon As Array + +Format in `[lon, lat]`, note, the order of lon/lat here in order to +conform with http://geojson.org/[GeoJSON]. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "geo1" : { + "geo_distance" : { + "pin.location" : [40, -70], + "ranges" : [ + { "to" : 10 }, + { "from" : 10, "to" : 20 }, + { "from" : 20, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +===== Lat Lon As String + +Format in `lat,lon`. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "geo1" : { + "geo_distance" : { + "pin.location" : "40, -70", + "ranges" : [ + { "to" : 10 }, + { "from" : 10, "to" : 20 }, + { "from" : 20, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +===== Geohash + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "geo1" : { + "geo_distance" : { + "pin.location" : "drm3btev3e86", + "ranges" : [ + { "to" : 10 }, + { "from" : 10, "to" : 20 }, + { "from" : 20, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +==== Ranges + +When a `to` or `from` are not set, they are assumed to be unbounded. +Ranges are allowed to overlap, basically, each range is treated by +itself. + +==== Options + +[cols="<,<",options="header",] +|======================================================================= +|Option |Description +|`unit` |The unit the ranges are provided in. Defaults to `km`. Can also +be `mi`, `miles`, `in`, `inch`, `yd`, `yards`, `ft`, `feet`, `kilometers`, `mm`, `millimeters`, `cm`, `centimeters`, `m` or `meters`. + +|`distance_type` |How to compute the distance. Can either be `arc` +(better precision), `sloppy_arc` (faster) or `plane` (fastest). Defaults to `sloppy_arc`. +|======================================================================= + +==== Value Options + +On top of the count of hits falling within each range, aggregated data +can be provided (total) as well. By default, the aggregated data will +simply use the distance calculated, but the value can be extracted +either using a different numeric field, or a script. Here is an example +of using a different numeric field: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "geo1" : { + "geo_distance" : { + "pin.location" : "drm3btev3e86", + "value_field" : "num1", + "ranges" : [ + { "to" : 10 }, + { "from" : 10, "to" : 20 }, + { "from" : 20, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +And here is an example of using a script: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "geo1" : { + "geo_distance" : { + "pin.location" : "drm3btev3e86", + "value_script" : "doc['num1'].value * factor", + "params" : { + "factor" : 5 + } + "ranges" : [ + { "to" : 10 }, + { "from" : 10, "to" : 20 }, + { "from" : 20, "to" : 100 }, + { "from" : 100 } + ] + } + } + } +} +-------------------------------------------------- + +Note the params option, allowing to pass parameters to the script +(resulting in faster script execution instead of providing the values +within the script each time). + +.`geo_point` Type +[NOTE] +-- +The facet *requires* the `geo_point` type to be set on the relevant +field. +-- + +.Multi Location Per Document +[NOTE] +-- +The facet can work with multiple locations per document. +-- diff --git a/docs/reference/search/facets/histogram-facet.asciidoc b/docs/reference/search/facets/histogram-facet.asciidoc new file mode 100644 index 0000000..284a058 --- /dev/null +++ b/docs/reference/search/facets/histogram-facet.asciidoc @@ -0,0 +1,138 @@ +[[search-facets-histogram-facet]] +=== Histogram Facets + +The histogram facet works with numeric data by building a histogram +across intervals of the field values. Each value is "rounded" into an +interval (or placed in a bucket), and statistics are provided per +interval/bucket (count and total). Here is a simple example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "histogram" : { + "field" : "field_name", + "interval" : 100 + } + } + } +} +-------------------------------------------------- + +The above example will run a histogram facet on the `field_name` filed, +with an `interval` of `100` (so, for example, a value of `1055` will be +placed within the `1000` bucket). + +The interval can also be provided as a time based interval (using the +time format). This mainly make sense when working on date fields or +field that represent absolute milliseconds, here is an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "histogram" : { + "field" : "field_name", + "time_interval" : "1.5h" + } + } + } +} +-------------------------------------------------- + +==== Key and Value + +The histogram facet allows to use a different key and value. The key is +used to place the hit/document within the appropriate bucket, and the +value is used to compute statistical data (for example, total). Here is +an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "histogram" : { + "key_field" : "key_field_name", + "value_field" : "value_field_name", + "interval" : 100 + } + } + } +} +-------------------------------------------------- + +==== Script Key and Value + +Sometimes, some munging of both the key and the value are needed. In the +key case, before it is rounded into a bucket, and for the value, when +the statistical data is computed per bucket +<<modules-scripting,scripts>> can be used. Here +is an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "histogram" : { + "key_script" : "doc['date'].date.minuteOfHour", + "value_script" : "doc['num1'].value" + } + } + } +} +-------------------------------------------------- + +In the above sample, we can use a date type field called `date` to get +the minute of hour from it, and the total will be computed based on +another field `num1`. Note, in this case, no `interval` was provided, so +the bucket will be based directly on the `key_script` (no rounding). + +Parameters can also be provided to the different scripts (preferable if +the script is the same, with different values for a specific parameter, +like "factor"): + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "histo1" : { + "histogram" : { + "key_script" : "doc['date'].date.minuteOfHour * factor1", + "value_script" : "doc['num1'].value + factor2", + "params" : { + "factor1" : 2, + "factor2" : 3 + } + } + } + } +} +-------------------------------------------------- + +==== Memory Considerations + +In order to implement the histogram facet, the relevant field values are +loaded into memory from the index. This means that per shard, there +should be enough memory to contain them. Since by default, dynamic +introduced types are `long` and `double`, one option to reduce the +memory footprint is to explicitly set the types for the relevant fields +to either `short`, `integer`, or `float` when possible. diff --git a/docs/reference/search/facets/query-facet.asciidoc b/docs/reference/search/facets/query-facet.asciidoc new file mode 100644 index 0000000..3f360da --- /dev/null +++ b/docs/reference/search/facets/query-facet.asciidoc @@ -0,0 +1,19 @@ +[[search-facets-query-facet]] +=== Query Facets + +A facet query allows to return a count of the hits matching the facet +query. The query itself can be expressed using the Query DSL. For +example: + +[source,js] +-------------------------------------------------- +{ + "facets" : { + "wow_facet" : { + "query" : { + "term" : { "tag" : "wow" } + } + } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/facets/range-facet.asciidoc b/docs/reference/search/facets/range-facet.asciidoc new file mode 100644 index 0000000..fa263ee --- /dev/null +++ b/docs/reference/search/facets/range-facet.asciidoc @@ -0,0 +1,119 @@ +[[search-facets-range-facet]] +=== Range Facets + +`range` facet allows to specify a set of ranges and get both the number +of docs (count) that fall within each range, and aggregated data either +based on the field, or using another field. Here is a simple example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "range1" : { + "range" : { + "field" : "field_name", + "ranges" : [ + { "to" : 50 }, + { "from" : 20, "to" : 70 }, + { "from" : 70, "to" : 120 }, + { "from" : 150 } + ] + } + } + } +} +-------------------------------------------------- + +Another option which is a bit more DSL enabled is to provide the ranges +on the actual field name, for example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "range1" : { + "range" : { + "my_field" : [ + { "to" : 50 }, + { "from" : 20, "to" : 70 }, + { "from" : 70, "to" : 120 }, + { "from" : 150 } + ] + } + } + } +} +-------------------------------------------------- + +The `range` facet always includes the `from` parameter and excludes the +`to` parameter for each range. + +==== Key and Value + +The `range` facet allows to use a different field to check if its value +falls within a range, and another field to compute aggregated data per +range (like total). For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "range1" : { + "range" : { + "key_field" : "field_name", + "value_field" : "another_field_name", + "ranges" : [ + { "to" : 50 }, + { "from" : 20, "to" : 70 }, + { "from" : 70, "to" : 120 }, + { "from" : 150 } + ] + } + } + } +} +-------------------------------------------------- + +==== Script Key and Value + +Sometimes, some munging of both the key and the value are needed. In the +key case, before it is checked if it falls within a range, and for the +value, when the statistical data is computed per range scripts can be +used. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "range1" : { + "range" : { + "key_script" : "doc['date'].date.minuteOfHour", + "value_script" : "doc['num1'].value", + "ranges" : [ + { "to" : 50 }, + { "from" : 20, "to" : 70 }, + { "from" : 70, "to" : 120 }, + { "from" : 150 } + ] + } + } + } +} +-------------------------------------------------- + +==== Date Ranges + +The range facet support also providing the range as string formatted +dates. diff --git a/docs/reference/search/facets/statistical-facet.asciidoc b/docs/reference/search/facets/statistical-facet.asciidoc new file mode 100644 index 0000000..dfa51df --- /dev/null +++ b/docs/reference/search/facets/statistical-facet.asciidoc @@ -0,0 +1,101 @@ +[[search-facets-statistical-facet]] +=== Statistical Facet + +Statistical facet allows to compute statistical data on a numeric +fields. The statistical data include count, total, sum of squares, mean +(average), minimum, maximum, variance, and standard deviation. Here is +an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "stat1" : { + "statistical" : { + "field" : "num1" + } + } + } +} +-------------------------------------------------- + +==== Script field + +When using `field`, the numeric value of the field is used to compute +the statistical information. Sometimes, several fields values represent +the statistics we want to compute, or some sort of mathematical +evaluation. The script field allows to define a +<<modules-scripting,script>> to evaluate, with +its value used to compute the statistical information. For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "stat1" : { + "statistical" : { + "script" : "doc['num1'].value + doc['num2'].value" + } + } + } +} +-------------------------------------------------- + +Parameters can also be provided to the different scripts (preferable if +the script is the same, with different values for a specific parameter, +like "factor"): + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "stat1" : { + "statistical" : { + "script" : "(doc['num1'].value + doc['num2'].value) * factor", + "params" : { + "factor" : 5 + } + } + } + } +} +-------------------------------------------------- + +==== Multi Field + +The statistical facet can be executed against more than one field, +returning the aggregation result across those fields. For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "facets" : { + "stat1" : { + "statistical" : { + "fields" : ["num1", "num2"] + } + } + } +} +-------------------------------------------------- + +==== Memory Considerations + +In order to implement the statistical facet, the relevant field values +are loaded into memory from the index. This means that per shard, there +should be enough memory to contain them. Since by default, dynamic +introduced types are `long` and `double`, one option to reduce the +memory footprint is to explicitly set the types for the relevant fields +to either `short`, `integer`, or `float` when possible. diff --git a/docs/reference/search/facets/terms-facet.asciidoc b/docs/reference/search/facets/terms-facet.asciidoc new file mode 100644 index 0000000..29b24dc --- /dev/null +++ b/docs/reference/search/facets/terms-facet.asciidoc @@ -0,0 +1,288 @@ +[[search-facets-terms-facet]] +=== Terms Facet + +Allow to specify field facets that return the N most frequent terms. For +example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "field" : "tag", + "size" : 10 + } + } + } +} +-------------------------------------------------- + +It is preferred to have the terms facet executed on a non analyzed +field, or a field without a large number of terms it breaks to. + +==== Accuracy Control + +The `size` parameter defines how many top terms should be returned out +of the overall terms list. By default, the node coordinating the +search process will ask each shard to provide its own top `size` terms +and once all shards respond, it will reduce the results to the final list +that will then be sent back to the client. This means that if the number +of unique terms is greater than `size`, the returned list is slightly off +and not accurate (it could be that the term counts are slightly off and it +could even be that a term that should have been in the top `size` entries +was not returned). + +The higher the requested `size` is, the more accurate the results will be, +but also, the more expensive it will be to compute the final results (both +due to bigger priority queues that are managed on a shard level and due to +bigger data transfers between the nodes and the client). In an attempt to +minimize the extra work that comes with bigger requested `size` the +`shard_size` parameter was introduced. When defined, it will determine +how many terms the coordinating node will request from each shard. Once +all the shards responded, the coordinating node will then reduce them +to a final result which will be based on the `size` parameter - this way, +one can increase the accuracy of the returned terms and avoid the overhead +of streaming a big list of terms back to the client. + +Note that `shard_size` cannot be smaller than `size`... if that's the case +elasticsearch will override it and reset it to be equal to `size`. + + +==== Ordering + +Allow to control the ordering of the terms facets, to be ordered by +`count`, `term`, `reverse_count` or `reverse_term`. The default is +`count`. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "field" : "tag", + "size" : 10, + "order" : "term" + } + } + } +} +-------------------------------------------------- + +==== All Terms + +Allow to get all the terms in the terms facet, ones that do not match a +hit, will have a count of 0. Note, this should not be used with fields +that have many terms. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "field" : "tag", + "all_terms" : true + } + } + } +} +-------------------------------------------------- + +==== Excluding Terms + +It is possible to specify a set of terms that should be excluded from +the terms facet request result: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "field" : "tag", + "exclude" : ["term1", "term2"] + } + } + } +} +-------------------------------------------------- + +==== Regex Patterns + +The terms API allows to define regex expression that will control which +terms will be included in the faceted list, here is an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "field" : "tag", + "regex" : "_regex expression here_", + "regex_flags" : "DOTALL" + } + } + } +} +-------------------------------------------------- + +Check +http://download.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html#field_summary[Java +Pattern API] for more details about `regex_flags` options. + +==== Term Scripts + +Allow to define a script for terms facet to process the actual term that +will be used in the term facet collection, and also optionally control +its inclusion or not. + +The script can either return a boolean value, with `true` to include it +in the facet collection, and `false` to exclude it from the facet +collection. + +Another option is for the script to return a `string` controlling the +term that will be used to count against. The script execution will +include the term variable which is the current field term used. + +For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "field" : "tag", + "size" : 10, + "script" : "term + 'aaa'" + } + } + } +} +-------------------------------------------------- + +And using the boolean feature: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "field" : "tag", + "size" : 10, + "script" : "term == 'aaa' ? true : false" + } + } + } +} +-------------------------------------------------- + +==== Multi Fields + +The term facet can be executed against more than one field, returning +the aggregation result across those fields. For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag" : { + "terms" : { + "fields" : ["tag1", "tag2"], + "size" : 10 + } + } + } +} +-------------------------------------------------- + +==== Script Field + +A script that provides the actual terms that will be processed for a +given doc. A `script_field` (or `script` which will be used when no +`field` or `fields` are provided) can be set to provide it. + +As an example, a search request (that is quite "heavy") can be executed +and use either `_source` itself or `_fields` (for stored fields) without +needing to load the terms to memory (at the expense of much slower +execution of the search, and causing more IO load): + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "my_facet" : { + "terms" : { + "script_field" : "_source.my_field", + "size" : 10 + } + } + } +} +-------------------------------------------------- + +Or: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "my_facet" : { + "terms" : { + "script_field" : "_fields['my_field']", + "size" : 10 + } + } + } +} +-------------------------------------------------- + +Note also, that the above will use the whole field value as a single +term. + +==== _index + +The term facet allows to specify a special field name called `_index`. +This will return a facet count of hits per `_index` the search was +executed on (relevant when a search request spans more than one index). + +==== Memory Considerations + +Term facet causes the relevant field values to be loaded into memory. +This means that per shard, there should be enough memory to contain +them. It is advisable to explicitly set the fields to be `not_analyzed` +or make sure the number of unique tokens a field can have is not large. diff --git a/docs/reference/search/facets/terms-stats-facet.asciidoc b/docs/reference/search/facets/terms-stats-facet.asciidoc new file mode 100644 index 0000000..cd48757 --- /dev/null +++ b/docs/reference/search/facets/terms-stats-facet.asciidoc @@ -0,0 +1,51 @@ +[[search-facets-terms-stats-facet]] +=== Terms Stats Facet + +The `terms_stats` facet combines both the +<<search-facets-terms-facet,terms>> and +<<search-facets-statistical-facet,statistical>> +allowing to compute stats computed on a field, per term value driven by +another field. For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : { } + }, + "facets" : { + "tag_price_stats" : { + "terms_stats" : { + "key_field" : "tag", + "value_field" : "price" + } + } + } +} +-------------------------------------------------- + +The `size` parameter controls how many facet entries will be returned. +It defaults to `10`. Setting it to 0 will return all terms matching the +hits (be careful not to return too many results). + +One can also set `shard_size` (in addition to `size`) which will determine +how many term entries will be requested from each shard. When dealing +with field with high cardinality (at least higher than the requested `size`) +The greater `shard_size` is - the more accurate the result will be (and the +more expensive the overall facet computation will be). `shard_size` is there +to enable you to increase accuracy yet still avoid returning too many +terms_stats entries back to the client. + +Ordering is done by setting `order`, with possible values of `term`, +`reverse_term`, `count`, `reverse_count`, `total`, `reverse_total`, +`min`, `reverse_min`, `max`, `reverse_max`, `mean`, `reverse_mean`. +Defaults to `count`. + +The value computed can also be a script, using the `value_script` +instead of `value_field`, in which case the `lang` can control its +language, and `params` allow to provide custom parameters (as in other +scripted components). + +Note, the terms stats can work with multi valued key fields, or multi +valued value fields, but not when both are multi valued (as ordering is +not maintained). diff --git a/docs/reference/search/more-like-this.asciidoc b/docs/reference/search/more-like-this.asciidoc new file mode 100644 index 0000000..28bd078 --- /dev/null +++ b/docs/reference/search/more-like-this.asciidoc @@ -0,0 +1,27 @@ +[[search-more-like-this]] +== More Like This API + +The more like this (mlt) API allows to get documents that are "like" a +specified document. Here is an example: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/tweet/1/_mlt?mlt_fields=tag,content&min_doc_freq=1' +-------------------------------------------------- + +The API simply results in executing a search request with +<<query-dsl-mlt-query,moreLikeThis>> query (http +parameters match the parameters to the `more_like_this` query). This +means that the body of the request can optionally include all the +request body options in the <<search-search,search +API>> (facets, from/to and so on). + +Rest parameters relating to search are also allowed, including +`search_type`, `search_indices`, `search_types`, `search_scroll`, +`search_size` and `search_from`. + +When no `mlt_fields` are specified, all the fields of the document will +be used in the `more_like_this` query generated. + +Note: In order to use the `mlt` feature a `mlt_field` needs to be either +be `stored`, store `term_vector` or `source` needs to be enabled. diff --git a/docs/reference/search/multi-search.asciidoc b/docs/reference/search/multi-search.asciidoc new file mode 100644 index 0000000..c51bcac --- /dev/null +++ b/docs/reference/search/multi-search.asciidoc @@ -0,0 +1,78 @@ +[[search-multi-search]] +== Multi Search API + +The multi search API allows to execute several search requests within +the same API. The endpoint for it is `_msearch`. + +The format of the request is similar to the bulk API format, and the +structure is as follows (the structure is specifically optimized to +reduce parsing if a specific search ends up redirected to another node): + +[source,js] +-------------------------------------------------- +header\n +body\n +header\n +body\n +-------------------------------------------------- + +The header part includes which index / indices to search on, optional +(mapping) types to search on, the `search_type`, `preference`, and +`routing`. The body includes the typical search body request (including +the `query`, `facets`, `from`, `size`, and so on). Here is an example: + +[source,js] +-------------------------------------------------- +$ cat requests +{"index" : "test"} +{"query" : {"match_all" : {}}, "from" : 0, "size" : 10} +{"index" : "test", "search_type" : "count"} +{"query" : {"match_all" : {}}} +{} +{"query" : {"match_all" : {}}} + +{"query" : {"match_all" : {}}} +{"search_type" : "count"} +{"query" : {"match_all" : {}}} + +$ curl -XGET localhost:9200/_msearch --data-binary @requests; echo +-------------------------------------------------- + +Note, the above includes an example of an empty header (can also be just +without any content) which is supported as well. + +The response returns a `responses` array, which includes the search +response for each search request matching its order in the original +multi search request. If there was a complete failure for that specific +search request, an object with `error` message will be returned in place +of the actual search response. + +The endpoint allows to also search against an index/indices and +type/types in the URI itself, in which case it will be used as the +default unless explicitly defined otherwise in the header. For example: + +[source,js] +-------------------------------------------------- +$ cat requests +{} +{"query" : {"match_all" : {}}, "from" : 0, "size" : 10} +{} +{"query" : {"match_all" : {}}} +{"index" : "test2"} +{"query" : {"match_all" : {}}} + +$ curl -XGET localhost:9200/test/_msearch --data-binary @requests; echo +-------------------------------------------------- + +The above will execute the search against the `test` index for all the +requests that don't define an index, and the last one will be executed +against the `test2` index. + +The `search_type` can be set in a similar manner to globally apply to +all search requests. + +[float] +[[msearch-security]] +=== Security + +See <<url-access-control>> diff --git a/docs/reference/search/percolate.asciidoc b/docs/reference/search/percolate.asciidoc new file mode 100644 index 0000000..c214d80 --- /dev/null +++ b/docs/reference/search/percolate.asciidoc @@ -0,0 +1,447 @@ +[[search-percolate]] +== Percolator + +added[1.0.0.Beta1] + +Traditionally you design documents based on your data and store them into an index and then define queries via the search api +in order to retrieve these documents. The percolator works in the opposite direction, first you store queries into an +index and then via the percolate api you define documents in order to retrieve these queries. + +The reason that queries can be stored comes from the fact that in Elasticsearch both documents and queries are defined in +JSON. This allows you to embed queries into documents via the index api. Elasticsearch can extract the query from a +document and make it available to the percolate api. Since documents are also defines as json, you can define a document +in a request to the percolate api. + +The percolator and most of its features work in realtime, so once a percolate query is indexed it can immediately be used +in the percolate api. + +[float] +=== Sample usage + +Adding a query to the percolator: + +[source,js] +-------------------------------------------------- +curl -XPUT 'localhost:9200/my-index/.percolator/1' -d '{ + "query" : { + "match" : { + "message" : "bonsai tree" + } + } +}' +-------------------------------------------------- + +Matching documents to the added queries: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/my-index/message/_percolate' -d '{ + "doc" : { + "message" : "A new bonsai tree in the office" + } +}' +-------------------------------------------------- + +The above request will yield the following response: + +[source,js] +-------------------------------------------------- +{ + "took" : 19, + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0 + }, + "total" : 1, + "matches" : [ + { + "_index" : "my-index", + "_id" : "1" + } + ] +} +-------------------------------------------------- + +The percolate api returns matches that refer to percolate queries that have matched with the document defined in the percolate api. + +[float] +=== Indexing percolator queries + +Percolate queries are stored as documents in a specific format and in an arbitrary index under a reserved type with the +name `.percolator`. The query itself is placed as is in a json objects under the top level field `query`. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match" : { + "field" : "value" + } + } +} +-------------------------------------------------- + +Since this is just an ordinary document, any field can be added to this document. This can be useful later on to only +percolate documents by specific queries. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match" : { + "field" : "value" + } + }, + "priority" : "high" +} +-------------------------------------------------- + +On top of this also a mapping type can be associated with the this query. This allows to control how certain queries +like range queries, shape filters and other query & filters that rely on mapping settings get constructed. This is +important since the percolate queries are indexed into the `.percolator` type, and the queries / filters that rely on +mapping settings would yield unexpected behaviour. Note by default field names do get resolved in a smart manner, +but in certain cases with multiple types this can lead to unexpected behaviour, so being explicit about it will help. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "range" : { + "created_at" : { + "gte" : "2010-01-01T00:00:00", + "lte" : "2011-01-01T00:00:00" + } + } + }, + "type" : "tweet", + "priority" : "high" +} +-------------------------------------------------- + +In the above example the range query gets really parsed into a Lucene numeric range query, based on the settings for +the field `created_at` in the type `tweet`. + +Just as with any other type, the `.percolator` type has a mapping, which you can configure via the mappings apis. +The default percolate mapping doesn't index the query field and only stores it. + +Because `.percolate` is a type it also has a mapping. By default the following mapping is active: + +[source,js] +-------------------------------------------------- +{ + ".percolator" : { + "properties" : { + "query" : { + "type" : "object", + "enabled" : false + } + } + } +} +-------------------------------------------------- + +If needed this mapping can be modified wit the update mapping api. + +In order to un-register a percolate query the delete api can be used. So if the previous added query needs to be deleted +the following delete requests needs to be executed: + +[source,js] +-------------------------------------------------- +curl -XDELETE localhost:9200/my-index/.percolator/1 +-------------------------------------------------- + +[float] +=== Percolate api + +The percolate api executes in a distributed manner, meaning it executes on all shards an index points to. + +.Required options +* `index` - The index that contains the `.percolator` type. This can also be an alias. +* `type` - The type of the document to be percolated. The mapping of that type is used to parse document. +* `doc` - The actual document to percolate. Unlike the other two options this needs to be specified in the request body. Note this isn't required when percolating an existing document. + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/twitter/tweet/_percolate' -d '{ + "doc" : { + "created_at" : "2010-10-10T00:00:00", + "message" : "some text" + } +}' +-------------------------------------------------- + +.Additional supported query string options +* `routing` - In the case the percolate queries are partitioned by a custom routing value, that routing option make sure +that the percolate request only gets executed on the shard where the routing value is partitioned to. This means that +the percolate request only gets executed on one shard instead of all shards. Multiple values can be specified as a +comma separated string, in that case the request can be be executed on more than one shard. +* `preference` - Controls which shard replicas are preferred to execute the request on. Works the same as in the search api. +* `ignore_unavailable` - Controls if missing concrete indices should silently be ignored. Same as is in the search api. +* `percolate_format` - If `ids` is specified then the matches array in the percolate response will contain a string +array of the matching ids instead of an array of objects. This can be useful the reduce the amount of data being send +back to the client. Obviously if there are to percolator queries with same id from different indices there is no way +the find out which percolator query belongs to what index. Any other value to `percolate_format` will be ignored. + +.Additional request body options +* `filter` - Reduces the number queries to execute during percolating. Only the percolator queries that match with the +filter will be included in the percolate execution. The filter option works in near realtime, so a refresh needs to have +occurred for the filter to included the latest percolate queries. +* `query` - Same as the `filter` option, but also the score is computed. The computed scores can then be used by the +`track_scores` and `sort` option. +* `size` - Defines to maximum number of matches (percolate queries) to be returned. Defaults to unlimited. +* `track_scores` - Whether the `_score` is included for each match. The is based on the query and represents how the query matched +to the percolate query's metadata and *not* how the document being percolated matched to the query. The `query` option +is required for this option. Defaults to `false`. +* `sort` - Define a sort specification like in the search api. Currently only sorting `_score` reverse (default relevancy) +is supported. Other sort fields will throw an exception. The `size` and `query` option are required for this setting. Like +`track_score` the score is based on the query and represents how the query matched to the percolate query's metadata +and *not* how the document being percolated matched to the query. +* `facets` - Allows facet definitions to be included. The facets are based on the matching percolator queries. See facet +documentation how to define facets. +* `aggs` - Allows aggregation definitions to be included. The aggregations are based on the matching percolator queries, +look at the aggregation documentation on how to define aggregations. +* `highlight` - Allows highlight definitions to be included. The document being percolated is being highlight for each +matching query. This allows you to see how each match is highlighting the document being percolated. See highlight +documentation on how to define highlights. The `size` option is required for highlighting, the performance of highlighting + in the percolate api depends of how many matches are being highlighted. + +[float] +=== Dedicated percolator index + +Percolate queries can be added to any index. Instead of adding percolate queries to the index the data resides in, +these queries can also be added to an dedicated index. The advantage of this is that this dedicated percolator index +can have its own index settings (For example the number of primary and replicas shards). If you choose to have a dedicated +percolate index, you need to make sure that the mappings from the normal index are also available on the percolate index. +Otherwise percolate queries can be parsed incorrectly. + +[float] +=== Filtering Executed Queries + +Filtering allows to reduce the number of queries, any filter that the search api supports, (expect the ones mentioned in important notes) +can also be used in the percolate api. The filter only works on the metadata fields. The `query` field isn't indexed by +default. Based on the query we indexed before the following filter can be defined: + +[source,js] +-------------------------------------------------- +curl -XGET localhost:9200/test/type1/_percolate -d '{ + "doc" : { + "field" : "value" + }, + "filter" : { + "term" : { + "priority" : "high" + } + } +}' +-------------------------------------------------- + +[float] +=== Percolator count api + +The count percolate api, only keeps track of the number of matches and doesn't keep track of the actual matches +Example: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/my-index/my-type/_percolate/count' -d '{ + "doc" : { + "message" : "some message" + } +}' +-------------------------------------------------- + +Response: + +[source,js] +-------------------------------------------------- +{ + ... // header + "total" : 3 +} +-------------------------------------------------- + + +[float] +=== Percolating an existing document + +In order to percolate in newly indexed document, the percolate existing document can be used. Based on the response +from an index request the `_id` and other meta information can be used to the immediately percolate the newly added +document. + +.Supported options for percolating an existing document on top of existing percolator options: +* `id` - The id of the document to retrieve the source for. +* `percolate_index` - The index containing the percolate queries. Defaults to the `index` defined in the url. +* `percolate_type` - The percolate type (used for parsing the document). Default to `type` defined in the url. +* `routing` - The routing value to use when retrieving the document to percolate. +* `preference` - Which shard to prefer when retrieving the existing document. +* `percolate_routing` - The routing value to use when percolating the existing document. +* `percolate_preference` - Which shard to prefer when executing the percolate request. +* `version` - Enables a version check. If the fetched document's version isn't equal to the specified version then the request fails with a version conflict and the percolation request is aborted. +* `version_type` - Whether internal or external versioning is used. Defaults to internal versioning. + +Internally the percolate api will issue a get request for fetching the`_source` of the document to percolate. +For this feature to work the `_source` for documents to be percolated need to be stored. + +[float] +==== Example + +Index response: + +[source,js] +-------------------------------------------------- +{ + "_index" : "my-index", + "_type" : "message", + "_id" : "1", + "_version" : 1, + "created" : true +} +-------------------------------------------------- + +Percolating an existing document: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/my-index1/message/1/_percolate' +-------------------------------------------------- + +The response is the same as with the regular percolate api. + +[float] +=== Multi percolate api + +The multi percolate api allows to bundle multiple percolate requests into a single request, similar to what the multi +search api does to search requests. The request body format is line based. Each percolate request item takes two lines, +the first line is the header and the second line is the body. + +The header can contain any parameter that normally would be set via the request path or query string parameters. T +here are several percolate actions, because there are multiple types of percolate requests. + +.Supported actions: +* `percolate` - Action for defining a regular percolate request. +* `count` - Action for defining a count percolate request. + +Depending on the percolate action different parameters can be specified. For example the percolate and percolate existing +document actions support different parameters. + +.The following endpoints are supported +* GET|POST /[index]/[type]/_mpercolate +* GET}POST /[index]/_mpercolate +* GET|POST /_mpercolate + +The `index` and `type` defined in the url path are the default index and type. + +[float] +==== Example + +Request: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/twitter/tweet/_mpercolate' --data-binary @requests.txt; echo +-------------------------------------------------- + +The index twitter is the default index and the type tweet is the default type and will be used in the case a header +doesn't specify an index or type. + +requests.txt: + +[source,js] +-------------------------------------------------- +{"percolate" : {"index" : twitter", "type" : "tweet"}} +{"doc" : {"message" : "some text"}} +{"percolate" : {"index" : twitter", "type" : "tweet", "id" : "1"}} +{} +{"percolate" : {"index" : users", "type" : "user", "id" : "3", "percolate_index" : "users_2012" }} +{"size" : 10} +{"count" : {"index" : twitter", "type" : "tweet"}} +{"doc" : {"message" : "some other text"}} +{"count" : {"index" : twitter", "type" : "tweet", "id" : "1"}} +{} +-------------------------------------------------- + +For a percolate existing document item (headers with the `id` field), the response can be an empty json object. +All the required options are set in the header. + +Response: + +[source,js] +-------------------------------------------------- +{ + "items" : [ + { + "took" : 24, + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0, + }, + "total" : 3, + "matches" : ["1", "2", "3"] + }, + { + "took" : 12, + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0, + }, + "total" : 3, + "matches" : ["4", "5", "6"] + }, + { + "error" : "[user][3]document missing" + }, + { + "took" : 12, + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0, + }, + "total" : 3 + }, + { + "took" : 14, + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0, + }, + "total" : 3 + } + ] +} +-------------------------------------------------- + +Each item represents a percolate response, the order of the items maps to the order in where the percolate requests +were specified. In case a percolate request failed, the item response is substituted with an error message. + +[float] +=== How it works under the hood + +When indexing a document that contains a query in an index and the `.percolator` type the query part of the documents gets +parsed into a Lucene query and is kept in memory until that percolator document is removed or the index containing the +`.percolator` type get removed. So all the active percolator queries are kept in memory. + +At percolate time the document specified in the request gets parsed into a Lucene document and is stored in a in-memory +Lucene index. This in-memory index can just hold this one document and it is optimized for that. Then all the queries +that are registered to the index that the percolate request is targeted for are going to be executed on this single document +in-memory index. This happens on each shard the percolate request need to execute. + +By using `routing`, `filter` or `query` features the amount of queries that need to be executed can be reduced and thus +the time the percolate api needs to run can be decreased. + +[float] +=== Important notes + +Because the percolator API is processing one document at a time, it doesn't support queries and filters that run +against child and nested documents such as `has_child`, `has_parent`, `top_children`, and `nested`. + +The `wildcard` and `regexp` query natively use a lot of memory and because the percolator keeps the queries into memory +this can easily take up the available memory in the heap space. If possible try to use a `prefix` query or ngramming to +achieve the same result (with way less memory being used). + +The delete-by-query api doesn't work to unregister a query, it only deletes the percolate documents from disk. In order +to update the registered queries in memory the index needs be closed and opened. diff --git a/docs/reference/search/request-body.asciidoc b/docs/reference/search/request-body.asciidoc new file mode 100644 index 0000000..4a4a70a --- /dev/null +++ b/docs/reference/search/request-body.asciidoc @@ -0,0 +1,112 @@ +[[search-request-body]] +== Request Body Search + +The search request can be executed with a search DSL, which includes the +<<query-dsl,Query DSL>>, within its body. Here is an +example: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/tweet/_search' -d '{ + "query" : { + "term" : { "user" : "kimchy" } + } +} +' +-------------------------------------------------- + +And here is a sample response: + +[source,js] +-------------------------------------------------- +{ + "_shards":{ + "total" : 5, + "successful" : 5, + "failed" : 0 + }, + "hits":{ + "total" : 1, + "hits" : [ + { + "_index" : "twitter", + "_type" : "tweet", + "_id" : "1", + "_source" : { + "user" : "kimchy", + "postDate" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" + } + } + ] + } +} +-------------------------------------------------- + +[float] +=== Parameters + +[cols="<,<",options="header",] +|======================================================================= +|Name |Description +|`timeout` |A search timeout, bounding the search request to be executed +within the specified time value and bail with the hits accumulated up to +that point when expired. Defaults to no timeout. + +|`from` |The starting from index of the hits to return. Defaults to `0`. + +|`size` |The number of hits to return. Defaults to `10`. + +|`search_type` |The type of the search operation to perform. Can be +`dfs_query_then_fetch`, `dfs_query_and_fetch`, `query_then_fetch`, +`query_and_fetch`. Defaults to `query_then_fetch`. See +<<search-request-search-type,_Search Type_>> for +more details on the different types of search that can be performed. +|======================================================================= + +Out of the above, the `search_type` is the one that can not be passed +within the search request body, and in order to set it, it must be +passed as a request REST parameter. + +The rest of the search request should be passed within the body itself. +The body content can also be passed as a REST parameter named `source`. + +Both HTTP GET and HTTP POST can be used to execute search with body. +Since not all clients support GET with body, POST is allowed as well. + + +include::request/query.asciidoc[] + +include::request/from-size.asciidoc[] + +include::request/sort.asciidoc[] + +include::request/source-filtering.asciidoc[] + +include::request/fields.asciidoc[] + +include::request/script-fields.asciidoc[] + +include::request/fielddata-fields.asciidoc[] + +include::request/post-filter.asciidoc[] + +include::request/highlighting.asciidoc[] + +include::request/rescore.asciidoc[] + +include::request/search-type.asciidoc[] + +include::request/scroll.asciidoc[] + +include::request/preference.asciidoc[] + +include::request/explain.asciidoc[] + +include::request/version.asciidoc[] + +include::request/index-boost.asciidoc[] + +include::request/min-score.asciidoc[] + +include::request/named-queries-and-filters.asciidoc[] diff --git a/docs/reference/search/request/explain.asciidoc b/docs/reference/search/request/explain.asciidoc new file mode 100644 index 0000000..81dc110 --- /dev/null +++ b/docs/reference/search/request/explain.asciidoc @@ -0,0 +1,14 @@ +[[search-request-explain]] +=== Explain + +Enables explanation for each hit on how its score was computed. + +[source,js] +-------------------------------------------------- +{ + "explain": true, + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/request/fielddata-fields.asciidoc b/docs/reference/search/request/fielddata-fields.asciidoc new file mode 100644 index 0000000..6547c16 --- /dev/null +++ b/docs/reference/search/request/fielddata-fields.asciidoc @@ -0,0 +1,21 @@ +[[search-request-fielddata-fields]] +=== Field Data Fields + +Allows to return the field data representiation of a field for each hit, for +example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + ... + }, + "fielddata_fields" : ["test1", "test2"] +} +-------------------------------------------------- + +Field data fields can work on fields that are not stored. + +It's important to understand that using the `fielddata_fields` parameter will +cause the terms for that field to be loaded to memory (cached), which will +result in more memory consumption. diff --git a/docs/reference/search/request/fields.asciidoc b/docs/reference/search/request/fields.asciidoc new file mode 100644 index 0000000..659eaa6 --- /dev/null +++ b/docs/reference/search/request/fields.asciidoc @@ -0,0 +1,103 @@ +[[search-request-fields]] +=== Fields + +Allows to selectively load specific stored fields for each document represented +by a search hit. + +[source,js] +-------------------------------------------------- +{ + "fields" : ["user", "postDate"], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +`*` can be used to load all stored fields from the document. + +An empty array will cause only the `_id` and `_type` for each hit to be +returned, for example: + +[source,js] +-------------------------------------------------- +{ + "fields" : [], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + + +For backwards compatibility, if the fields parameter specifies fields which are not stored (`store` mapping set to +`false`), it will load the `_source` and extract it from it. This functionality has been replaced by the +<<search-request-source-filtering,source filtering>> parameter. + +Field values fetched from the document it self are always returned as an array. Metadata fields like `_routing` and +`_parent` fields are never returned as an array. + +Also only leaf fields can be returned via the `field` option. So object fields can't be returned and such requests +will fail. + +Script fields can also be automatically detected and used as fields, so +things like `_source.obj1.field1` can be used, though not recommended, as +`obj1.field1` will work as well. + +[[partial]] +==== Partial + +deprecated[1.0.0Beta1,Replaced by <<search-request-source-filtering>>] + + +When loading data from `_source`, partial fields can be used to use +wildcards to control what part of the `_source` will be loaded based on +`include` and `exclude` patterns. For example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "partial_fields" : { + "partial1" : { + "include" : "obj1.obj2.*", + } + } +} +-------------------------------------------------- + +And one that will also exclude `obj1.obj3`: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "partial_fields" : { + "partial1" : { + "include" : "obj1.obj2.*", + "exclude" : "obj1.obj3.*" + } + } +} +-------------------------------------------------- + +Both `include` and `exclude` support multiple patterns: + +[source,js] +-------------------------------------------------- +{ + "query" : { + "match_all" : {} + }, + "partial_fields" : { + "partial1" : { + "include" : ["obj1.obj2.*", "obj1.obj4.*"], + "exclude" : "obj1.obj3.*" + } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/request/from-size.asciidoc b/docs/reference/search/request/from-size.asciidoc new file mode 100644 index 0000000..d8d8095 --- /dev/null +++ b/docs/reference/search/request/from-size.asciidoc @@ -0,0 +1,21 @@ +[[search-request-from-size]] +=== From / Size + +Pagination of results can be done by using the `from` and `size` +parameters. The `from` parameter defines the offset from the first +result you want to fetch. The `size` parameter allows you to configure +the maximum amount of hits to be returned. + +Though `from` and `size` can be set as request parameters, they can also +be set within the search body. `from` defaults to `0`, and `size` +defaults to `10`. + +[source,js] +-------------------------------------------------- +{ + "from" : 0, "size" : 10, + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/request/highlighting.asciidoc b/docs/reference/search/request/highlighting.asciidoc new file mode 100644 index 0000000..00de5bc --- /dev/null +++ b/docs/reference/search/request/highlighting.asciidoc @@ -0,0 +1,549 @@ +[[search-request-highlighting]] +=== Highlighting + +Allows to highlight search results on one or more fields. The +implementation uses either the lucene `highlighter`, `fast-vector-highlighter` +or `postings-highlighter`. The following is an example of the search request +body: + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "fields" : { + "content" : {} + } + } +} +-------------------------------------------------- + +In the above case, the `content` field will be highlighted for each +search hit (there will be another element in each search hit, called +`highlight`, which includes the highlighted fields and the highlighted +fragments). + +In order to perform highlighting, the actual content of the field is +required. If the field in question is stored (has `store` set to `true` +in the mapping) it will be used, otherwise, the actual `_source` will +be loaded and the relevant field will be extracted from it. + +The field name supports wildcard notation. For example, using `comment_*` +will cause all fields that match the expression to be highlighted. + +==== Postings highlighter + +If `index_options` is set to `offsets` in the mapping the postings highlighter +will be used instead of the plain highlighter. The postings highlighter: + +* Is faster since it doesn't require to reanalyze the text to be highlighted: +the larger the documents the better the performance gain should be +* Requires less disk space than term_vectors, needed for the fast vector +highlighter +* Breaks the text into sentences and highlights them. Plays really well with +natural languages, not as well with fields containing for instance html markup +* Treats the document as the whole corpus, and scores individual sentences as +if they were documents in this corpus, using the BM25 algorithm + +Here is an example of setting the `content` field to allow for +highlighting using the postings highlighter on it: + +[source,js] +-------------------------------------------------- +{ + "type_name" : { + "content" : {"index_options" : "offsets"} + } +} +-------------------------------------------------- + +[NOTE] +Note that the postings highlighter is meant to perform simple query terms +highlighting, regardless of their positions. That means that when used for +instance in combination with a phrase query, it will highlight all the terms +that the query is composed of, regardless of whether they are actually part of +a query match, effectively ignoring their positions. + +[WARNING] +The postings highlighter does support highlighting of multi term queries, like +prefix queries, wildcard queries and so on. On the other hand, this requires +the queries to be rewritten using a proper +<<query-dsl-multi-term-rewrite,rewrite method>> that supports multi term +extraction, which is a potentially expensive operation. + + +==== Fast vector highlighter + +If `term_vector` information is provided by setting `term_vector` to +`with_positions_offsets` in the mapping then the fast vector highlighter +will be used instead of the plain highlighter. The fast vector highlighter: + +* Is faster especially for large fields (> `1MB`) +* Can be customized with `boundary_chars`, `boundary_max_scan`, and + `fragment_offset` (see <<boundary-characters,below>>) +* Requires setting `term_vector` to `with_positions_offsets` which + increases the size of the index +* Can combine matches from multiple fields into one result. See + `matched_fields` +* Can assign different weights to matches at different positions allowing + for things like phrase matches being sorted above term matches when + highlighting a Boosting Query that boosts phrase matches over term matches + +Here is an example of setting the `content` field to allow for +highlighting using the fast vector highlighter on it (this will cause +the index to be bigger): + +[source,js] +-------------------------------------------------- +{ + "type_name" : { + "content" : {"term_vector" : "with_positions_offsets"} + } +} +-------------------------------------------------- + +==== Force highlighter type + +The `type` field allows to force a specific highlighter type. This is useful +for instance when needing to use the plain highlighter on a field that has +`term_vectors` enabled. The allowed values are: `plain`, `postings` and `fvh`. +The following is an example that forces the use of the plain highlighter: + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "fields" : { + "content" : {"type" : "plain"} + } + } +} +-------------------------------------------------- + +==== Force highlighting on source + +added[1.0.0.RC1] + +Forces the highlighting to highlight fields based on the source even if fields are +stored separately. Defaults to `false`. + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "fields" : { + "content" : {"force_source" : true} + } + } +} +-------------------------------------------------- + +[[tags]] +==== Highlighting Tags + +By default, the highlighting will wrap highlighted text in `<em>` and +`</em>`. This can be controlled by setting `pre_tags` and `post_tags`, +for example: + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "pre_tags" : ["<tag1>"], + "post_tags" : ["</tag1>"], + "fields" : { + "_all" : {} + } + } +} +-------------------------------------------------- + +Using the fast vector highlighter there can be more tags, and the "importance" +is ordered. + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "pre_tags" : ["<tag1>", "<tag2>"], + "post_tags" : ["</tag1>", "</tag2>"], + "fields" : { + "_all" : {} + } + } +} +-------------------------------------------------- + +There are also built in "tag" schemas, with currently a single schema +called `styled` with the following `pre_tags`: + +[source,js] +-------------------------------------------------- +<em class="hlt1">, <em class="hlt2">, <em class="hlt3">, +<em class="hlt4">, <em class="hlt5">, <em class="hlt6">, +<em class="hlt7">, <em class="hlt8">, <em class="hlt9">, +<em class="hlt10"> +-------------------------------------------------- + +and `</em>` as `post_tags`. If you think of more nice to have built in tag +schemas, just send an email to the mailing list or open an issue. Here +is an example of switching tag schemas: + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "tags_schema" : "styled", + "fields" : { + "content" : {} + } + } +} +-------------------------------------------------- + + +==== Encoder + +An `encoder` parameter can be used to define how highlighted text will +be encoded. It can be either `default` (no encoding) or `html` (will +escape html, if you use html highlighting tags). + +==== Highlighted Fragments + +Each field highlighted can control the size of the highlighted fragment +in characters (defaults to `100`), and the maximum number of fragments +to return (defaults to `5`). +For example: + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "fields" : { + "content" : {"fragment_size" : 150, "number_of_fragments" : 3} + } + } +} +-------------------------------------------------- + +The `fragment_size` is ignored when using the postings highlighter, as it +outputs sentences regardless of their length. + +On top of this it is possible to specify that highlighted fragments need +to be sorted by score: + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "order" : "score", + "fields" : { + "content" : {"fragment_size" : 150, "number_of_fragments" : 3} + } + } +} +-------------------------------------------------- + +If the `number_of_fragments` value is set to `0` then no fragments are +produced, instead the whole content of the field is returned, and of +course it is highlighted. This can be very handy if short texts (like +document title or address) need to be highlighted but no fragmentation +is required. Note that `fragment_size` is ignored in this case. + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "fields" : { + "_all" : {}, + "bio.title" : {"number_of_fragments" : 0} + } + } +} +-------------------------------------------------- + +When using `fast-vector-highlighter` one can use `fragment_offset` +parameter to control the margin to start highlighting from. + +In the case where there is no matching fragment to highlight, the default is +to not return anything. Instead, we can return a snippet of text from the +beginning of the field by setting `no_match_size` (default `0`) to the length +of the text that you want returned. The actual length may be shorter than +specified as it tries to break on a word boundary. When using the postings +highlighter it is not possible to control the actual size of the snippet, +therefore the first sentence gets returned whenever `no_match_size` is +greater than `0`. + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "fields" : { + "content" : { + "fragment_size" : 150, + "number_of_fragments" : 3, + "no_match_size": 150 + } + } + } +} +-------------------------------------------------- + + +==== Highlight query + +It is also possible to highlight against a query other than the search +query by setting `highlight_query`. This is especially useful if you +use a rescore query because those are not taken into account by +highlighting by default. Elasticsearch does not validate that +`highlight_query` contains the search query in any way so it is possible +to define it so legitimate query results aren't highlighted at all. +Generally it is better to include the search query in the +`highlight_query`. Here is an example of including both the search +query and the rescore query in `highlight_query`. +[source,js] +-------------------------------------------------- +{ + "fields": [ "_id" ], + "query" : { + "match": { + "content": { + "query": "foo bar" + } + } + }, + "rescore": { + "window_size": 50, + "query": { + "rescore_query" : { + "match_phrase": { + "content": { + "query": "foo bar", + "phrase_slop": 1 + } + } + }, + "rescore_query_weight" : 10 + } + }, + "highlight" : { + "order" : "score", + "fields" : { + "content" : { + "fragment_size" : 150, + "number_of_fragments" : 3, + "highlight_query": { + "bool": { + "must": { + "match": { + "content": { + "query": "foo bar" + } + } + }, + "should": { + "match_phrase": { + "content": { + "query": "foo bar", + "phrase_slop": 1, + "boost": 10.0 + } + } + }, + "minimum_should_match": 0 + } + } + } + } + } +} +-------------------------------------------------- + +Note that the score of text fragment in this case is calculated by the Lucene +highlighting framework. For implementation details you can check the +`ScoreOrderFragmentsBuilder.java` class. On the other hand when using the +postings highlighter the fragments are scored using, as mentioned above, +the BM25 algorithm. + +[[highlighting-settings]] +==== Global Settings + +Highlighting settings can be set on a global level and then overridden +at the field level. + +[source,js] +-------------------------------------------------- +{ + "query" : {...}, + "highlight" : { + "number_of_fragments" : 3, + "fragment_size" : 150, + "tag_schema" : "styled", + "fields" : { + "_all" : { "pre_tags" : ["<em>"], "post_tags" : ["</em>"] }, + "bio.title" : { "number_of_fragments" : 0 }, + "bio.author" : { "number_of_fragments" : 0 }, + "bio.content" : { "number_of_fragments" : 5, "order" : "score" } + } + } +} +-------------------------------------------------- + +[[field-match]] +==== Require Field Match + +`require_field_match` can be set to `true` which will cause a field to +be highlighted only if a query matched that field. `false` means that +terms are highlighted on all requested fields regardless if the query +matches specifically on them. + +[[boundary-characters]] +==== Boundary Characters + +When highlighting a field using the fast vector highlighter, +`boundary_chars` can be configured to define what constitutes a boundary +for highlighting. It's a single string with each boundary character +defined in it. It defaults to `.,!? \t\n`. + +The `boundary_max_scan` allows to control how far to look for boundary +characters, and defaults to `20`. + + +[[matched-fields]] +==== Matched Fields +The Fast Vector Highlighter can combine matches on multiple fields to +highlight a single field using `matched_fields`. This is most +intuitive for multifields that analyze the same string in different +ways. All `matched_fields` must have `term_vector` set to +`with_positions_offsets` but only the field to which the matches are +combined is loaded so only that field would benefit from having +`store` set to `yes`. + +In the following examples `content` is analyzed by the `english` +analyzer and `content.plain` is analyzed by the `standard` analyzer. + +[source,js] +-------------------------------------------------- +{ + "query": { + "query_string": { + "query": "content.plain:running scissors", + "fields": ["content"] + } + }, + "highlight": { + "order": "score", + "fields": { + "content": { + "matched_fields": ["content", "content.plain"], + "type" : "fvh" + } + } + } +} +-------------------------------------------------- +The above matches both "run with scissors" and "running with scissors" +and would highlight "running" and "scissors" but not "run". If both +phrases appear in a large document then "running with scissors" is +sorted above "run with scissors" in the fragments list because there +are more matches in that fragment. + +[source,js] +-------------------------------------------------- +{ + "query": { + "query_string": { + "query": "running scissors", + "fields": ["content", "content.plain^10"] + } + }, + "highlight": { + "order": "score", + "fields": { + "content": { + "matched_fields": ["content", "content.plain"], + "type" : "fvh" + } + } + } +} +-------------------------------------------------- +The above highlights "run" as well as "running" and "scissors" but +still sorts "running with scissors" above "run with scissors" because +the plain match ("running") is boosted. + +[source,js] +-------------------------------------------------- +{ + "query": { + "query_string": { + "query": "running scissors", + "fields": ["content", "content.plain^10"] + } + }, + "highlight": { + "order": "score", + "fields": { + "content": { + "matched_fields": ["content.plain"], + "type" : "fvh" + } + } + } +} +-------------------------------------------------- +The above query wouldn't highlight "run" or "scissor" but shows that +it is just fine not to list the field to which the matches are combined +(`content`) in the matched fields. + +[NOTE] +Technically it is also fine to add fields to `matched_fields` that +don't share the same underlying string as the field to which the matches +are combined. The results might not make much sense and if one of the +matches is off the end of the text then the whole the query will fail. + +[NOTE] +=================================================================== +There is a small amount of overhead involved with setting +`matched_fields` to a non-empty array so always prefer +[source,js] +-------------------------------------------------- + "highlight": { + "fields": { + "content": {} + } + } +-------------------------------------------------- +to +[source,js] +-------------------------------------------------- + "highlight": { + "fields": { + "content": { + "matched_fields": ["content"], + "type" : "fvh" + } + } + } +-------------------------------------------------- +=================================================================== + +[[phrase-limit]] +==== Phrase Limit +The `fast-vector-highlighter` has a `phrase_limit` parameter that prevents +it from analyzing too many phrases and eating tons of memory. It defaults +to 256 so only the first 256 matching phrases in the document scored +considered. You can raise the limit with the `phrase_limit` parameter but +keep in mind that scoring more phrases consumes more time and memory. + +If using `matched_fields` keep in mind that `phrase_limit` phrases per +matched field are considered. diff --git a/docs/reference/search/request/index-boost.asciidoc b/docs/reference/search/request/index-boost.asciidoc new file mode 100644 index 0000000..29d1da3 --- /dev/null +++ b/docs/reference/search/request/index-boost.asciidoc @@ -0,0 +1,17 @@ +[[search-request-index-boost]] +=== Index Boost + +Allows to configure different boost level per index when searching +across more than one indices. This is very handy when hits coming from +one index matter more than hits coming from another index (think social +graph where each user has an index). + +[source,js] +-------------------------------------------------- +{ + "indices_boost" : { + "index1" : 1.4, + "index2" : 1.3 + } +} +-------------------------------------------------- diff --git a/docs/reference/search/request/min-score.asciidoc b/docs/reference/search/request/min-score.asciidoc new file mode 100644 index 0000000..f5a212e --- /dev/null +++ b/docs/reference/search/request/min-score.asciidoc @@ -0,0 +1,18 @@ +[[search-request-min-score]] +=== min_score + +Exclude documents which have a `_score` less than the minimum specified +in `min_score`: + +[source,js] +-------------------------------------------------- +{ + "min_score": 0.5, + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +Note, most times, this does not make much sense, but is provided for +advanced use cases. diff --git a/docs/reference/search/request/named-queries-and-filters.asciidoc b/docs/reference/search/request/named-queries-and-filters.asciidoc new file mode 100644 index 0000000..c28baec --- /dev/null +++ b/docs/reference/search/request/named-queries-and-filters.asciidoc @@ -0,0 +1,57 @@ +[[search-request-named-queries-and-filters]] +=== Named Queries and Filters + +Each filter and query can accept a `_name` in its top level definition. + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "bool" : { + "should" : [ + {"match" : { "name.first" : {"query" : "shay", "_name" : "first"} }}, + {"match" : { "name.last" : {"query" : "banon", "_name" : "last"} }} + ] + } + }, + "filter" : { + "terms" : { + "name.last" : ["banon", "kimchy"], + "_name" : "test" + } + } + } +} +-------------------------------------------------- + +The search response will include for each hit the `matched_filters` it matched on. The tagging of queries and filters +only make sense for compound queries and filters (such as `bool` query and filter, `or` and `and` filter, `filtered` query etc.). + +Note, the query filter had to be enhanced in order to support this. In +order to set a name, the `fquery` filter should be used, which wraps a +query (just so there will be a place to set a name for it), for example: + +[source,js] +-------------------------------------------------- +{ + "filtered" : { + "query" : { + "term" : { "name.first" : "shay" } + }, + "filter" : { + "fquery" : { + "query" : { + "term" : { "name.last" : "banon" } + }, + "_name" : "test" + } + } + } +} +-------------------------------------------------- + +==== Named queries + +The support for the `_name` option on queries as available from version `0.90.4` and the support on filters is available +also in versions before `0.90.4`. diff --git a/docs/reference/search/request/post-filter.asciidoc b/docs/reference/search/request/post-filter.asciidoc new file mode 100644 index 0000000..489ea96 --- /dev/null +++ b/docs/reference/search/request/post-filter.asciidoc @@ -0,0 +1,90 @@ +[[search-request-post-filter]] +=== Post filter + +The `post_filter` allows any filter that it holds to be executed as last filter, because +of this the `post_filter` only has affect on the search hits and not facets. + +There are several reasons why to specify filters as `post_filter`. One reason is to force +expensive filters to be executed as last filter, so that these filters only operate on the +docs that match with the rest of the query. An example of for what filter a post_filter +should be used for this reason is the `geo_distance` filter. The `geo_distance` filter is +in general an expensive filter to execute and to reduce the execution time for this filter, +one can choose to specify it as `post_filter`, so it runs on documents that are very likely +to be end up as matching documents. + +Another important reason is when doing things like facet navigation, +sometimes only the hits are needed to be filtered by the chosen facet, +and all the facets should continue to be calculated based on the original query. +The `post_filter` element within the search request can be used to accomplish it. + +Note, this is different compared to creating a `filtered` query with the +filter, since this will cause the facets to only process the filtered +results. + +For example, let's create two tweets, with two different tags: + +[source,js] +-------------------------------------------------- +curl -XPUT 'localhost:9200/twitter/tweet/1' -d ' +{ + "message" : "something blue", + "tag" : "blue" +} +' + +curl -XPUT 'localhost:9200/twitter/tweet/2' -d ' +{ + "message" : "something green", + "tag" : "green" +} +' + +curl -XPOST 'localhost:9200/_refresh' +-------------------------------------------------- + +We can now search for something, and have a terms facet. + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/twitter/_search?pretty=true' -d ' +{ + "query" : { + "term" : { "message" : "something" } + }, + "facets" : { + "tag" : { + "terms" : { "field" : "tag" } + } + } +} +' +-------------------------------------------------- + +We get two hits, and the relevant facets with a count of 1 for both +`green` and `blue`. Now, let's say the `green` facet is chosen, we can +simply add a filter for it: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/twitter/_search?pretty=true' -d ' +{ + "query" : { + "term" : { "message" : "something" } + }, + "post_filter" : { + "term" : { "tag" : "green" } + }, + "facets" : { + "tag" : { + "terms" : { "field" : "tag" } + } + } +} +' +-------------------------------------------------- + +And now, we get only 1 hit back, but the facets remain the same. + +Note, if additional filters are required on specific facets, they can be +added as a `facet_filter` to the relevant facets. + diff --git a/docs/reference/search/request/preference.asciidoc b/docs/reference/search/request/preference.asciidoc new file mode 100644 index 0000000..0a71a36 --- /dev/null +++ b/docs/reference/search/request/preference.asciidoc @@ -0,0 +1,42 @@ +[[search-request-preference]] +=== Preference + +Controls a `preference` of which shard replicas to execute the search +request on. By default, the operation is randomized between the shard +replicas. + +The `preference` can be set to: + +[horizontal] +`_primary`:: + The operation will go and be executed only on the primary + shards. + +`_primary_first`:: + The operation will go and be executed on the primary + shard, and if not available (failover), will execute on other shards. + +`_local`:: + The operation will prefer to be executed on a local + allocated shard if possible. + +`_only_node:xyz`:: + Restricts the search to execute only on a node with + the provided node id (`xyz` in this case). + +`_prefer_node:xyz`:: + Prefers execution on the node with the provided + node id (`xyz` in this case) if applicable. + +`_shards:2,3`:: + Restricts the operation to the specified shards. (`2` + and `3` in this case). This preference can be combined with other + preferences but it has to appear first: `_shards:2,3;_primary` + +Custom (string) value:: + A custom value will be used to guarantee that + the same shards will be used for the same custom value. This can help + with "jumping values" when hitting different shards in different refresh + states. A sample value can be something like the web session id, or the + user name. + diff --git a/docs/reference/search/request/query.asciidoc b/docs/reference/search/request/query.asciidoc new file mode 100644 index 0000000..e496320 --- /dev/null +++ b/docs/reference/search/request/query.asciidoc @@ -0,0 +1,14 @@ +[[search-request-query]] +=== Query + +The query element within the search request body allows to define a +query using the <<query-dsl,Query DSL>>. + +[source,js] +-------------------------------------------------- +{ + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/request/rescore.asciidoc b/docs/reference/search/request/rescore.asciidoc new file mode 100644 index 0000000..5011264 --- /dev/null +++ b/docs/reference/search/request/rescore.asciidoc @@ -0,0 +1,81 @@ +[[search-request-rescore]] +=== Rescoring + +Rescoring can help to improve precision by reordering just the top (eg +100 - 500) documents returned by the +<<search-request-query,`query`>> and +<<search-request-post-filter,`post_filter`>> phases, using a +secondary (usually more costly) algorithm, instead of applying the +costly algorithm to all documents in the index. + +A `rescore` request is executed on each shard before it returns its +results to be sorted by the node handling the overall search request. + +Currently the rescore API has only one implementation: the query +rescorer, which uses a query to tweak the scoring. In the future, +alternative rescorers may be made available, for example, a pair-wise rescorer. + +*Note:* the `rescore` phase is not executed when +<<search-request-search-type,`search_type`>> is set +to `scan` or `count`. + +==== Query rescorer + +The query rescorer executes a second query only on the Top-K results +returned by the <<search-request-query,`query`>> and +<<search-request-post-filter,`post_filter`>> phases. The +number of docs which will be examined on each shard can be controlled by +the `window_size` parameter, which defaults to +<<search-request-from-size,`from` and `size`>>. + +By default the scores from the original query and the rescore query are +combined linearly to produce the final `_score` for each document. The +relative importance of the original query and of the rescore query can +be controlled with the `query_weight` and `rescore_query_weight` +respectively. Both default to `1`. + +For example: + +[source,js] +-------------------------------------------------- +curl -s -XPOST 'localhost:9200/_search' -d '{ + "query" : { + "match" : { + "field1" : { + "operator" : "or", + "query" : "the quick brown", + "type" : "boolean" + } + } + }, + "rescore" : { + "window_size" : 50, + "query" : { + "rescore_query" : { + "match" : { + "field1" : { + "query" : "the quick brown", + "type" : "phrase", + "slop" : 2 + } + } + }, + "query_weight" : 0.7, + "rescore_query_weight" : 1.2 + } + } +} +' +-------------------------------------------------- + +The way the scores are combined can be controled with the `score_mode`: +[cols="<,<",options="header",] +|======================================================================= +|Score Mode |Description +|`total` |Add the original score and the rescore query score. The default. +|`multiply` |Multiply the original score by the rescore query score. Useful +for <<query-dsl-function-score-query,`function query`>> rescores. +|`avg` |Average the original score and the rescore query score. +|`max` |Take the max of original score and the rescore query score. +|`min` |Take the min of the original score and the rescore query score. +|======================================================================= diff --git a/docs/reference/search/request/script-fields.asciidoc b/docs/reference/search/request/script-fields.asciidoc new file mode 100644 index 0000000..46b1698 --- /dev/null +++ b/docs/reference/search/request/script-fields.asciidoc @@ -0,0 +1,60 @@ +[[search-request-script-fields]] +=== Script Fields + +Allows to return a <<modules-scripting,script +evaluation>> (based on different fields) for each hit, for example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + ... + }, + "script_fields" : { + "test1" : { + "script" : "doc['my_field_name'].value * 2" + }, + "test2" : { + "script" : "doc['my_field_name'].value * factor", + "params" : { + "factor" : 2.0 + } + } + } +} +-------------------------------------------------- + +Script fields can work on fields that are not stored (`my_field_name` in +the above case), and allow to return custom values to be returned (the +evaluated value of the script). + +Script fields can also access the actual `_source` document indexed and +extract specific elements to be returned from it (can be an "object" +type). Here is an example: + +[source,js] +-------------------------------------------------- + { + "query" : { + ... + }, + "script_fields" : { + "test1" : { + "script" : "_source.obj1.obj2" + } + } + } +-------------------------------------------------- + +Note the `_source` keyword here to navigate the json-like model. + +It's important to understand the difference between +`doc['my_field'].value` and `_source.my_field`. The first, using the doc +keyword, will cause the terms for that field to be loaded to memory +(cached), which will result in faster execution, but more memory +consumption. Also, the `doc[...]` notation only allows for simple valued +fields (can't return a json object from it) and make sense only on +non-analyzed or single term based fields. + +The `_source` on the other hand causes the source to be loaded, parsed, +and then only the relevant part of the json is returned. diff --git a/docs/reference/search/request/scroll.asciidoc b/docs/reference/search/request/scroll.asciidoc new file mode 100644 index 0000000..0694270 --- /dev/null +++ b/docs/reference/search/request/scroll.asciidoc @@ -0,0 +1,42 @@ +[[search-request-scroll]] +=== Scroll + +A search request can be scrolled by specifying the `scroll` parameter. +The `scroll` parameter is a time value parameter (for example: +`scroll=5m`), indicating for how long the nodes that participate in the +search will maintain relevant resources in order to continue and support +it. This is very similar in its idea to opening a cursor against a +database. + +A `scroll_id` is returned from the first search request (and from +continuous) scroll requests. The `scroll_id` should be used when +scrolling (along with the `scroll` parameter, to stop the scroll from +expiring). The scroll id can also be passed as part of the search +request body. + +*Note*: the `scroll_id` changes for each scroll request and only the +most recent one should be used. + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/tweet/_search?scroll=5m' -d '{ + "query": { + "query_string" : { + "query" : "some query string here" + } + } +} +' +-------------------------------------------------- + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_search/scroll?scroll=5m&scroll_id=c2Nhbjs2OzM0NDg1ODpzRlBLc0FXNlNyNm5JWUc1' +-------------------------------------------------- + +Scrolling is not intended for real time user requests, it is intended +for cases like scrolling over large portions of data that exists within +elasticsearch to reindex it for example. + +For more information on scrolling, see the +<<search-request-search-type,scan>> search type. diff --git a/docs/reference/search/request/search-type.asciidoc b/docs/reference/search/request/search-type.asciidoc new file mode 100644 index 0000000..6f4c7ba --- /dev/null +++ b/docs/reference/search/request/search-type.asciidoc @@ -0,0 +1,156 @@ +[[search-request-search-type]] +=== Search Type + +There are different execution paths that can be done when executing a +distributed search. The distributed search operation needs to be +scattered to all the relevant shards and then all the results are +gathered back. When doing scatter/gather type execution, there are +several ways to do that, specifically with search engines. + +One of the questions when executing a distributed search is how much +results to retrieve from each shard. For example, if we have 10 shards, +the 1st shard might hold the most relevant results from 0 till 10, with +other shards results ranking below it. For this reason, when executing a +request, we will need to get results from 0 till 10 from all shards, +sort them, and then return the results if we want to insure correct +results. + +Another question, which relates to search engine, is the fact that each +shard stands on its own. When a query is executed on a specific shard, +it does not take into account term frequencies and other search engine +information from the other shards. If we want to support accurate +ranking, we would need to first execute the query against all shards and +gather the relevant term frequencies, and then, based on it, execute the +query. + +Also, because of the need to sort the results, getting back a large +document set, or even scrolling it, while maintaing the correct sorting +behavior can be a very expensive operation. For large result set +scrolling without sorting, the `scan` search type (explained below) is +also available. + +Elasticsearch is very flexible and allows to control the type of search +to execute on a *per search request* basis. The type can be configured +by setting the *search_type* parameter in the query string. The types +are: + +[[query-and-fetch]] +==== Query And Fetch + +Parameter value: *query_and_fetch*. + +The most naive (and possibly fastest) implementation is to simply +execute the query on all relevant shards and return the results. Each +shard returns `size` results. Since each shard already returns `size` +hits, this type actually returns `size` times `number of shards` results +back to the caller. + +[[query-then-fetch]] +==== Query Then Fetch + +Parameter value: *query_then_fetch*. + +The query is executed against all shards, but only enough information is +returned (*not the document content*). The results are then sorted and +ranked, and based on it, *only the relevant shards* are asked for the +actual document content. The return number of hits is exactly as +specified in `size`, since they are the only ones that are fetched. This +is very handy when the index has a lot of shards (not replicas, shard id +groups). + +NOTE: This is the default setting, if you do not specify a `search_type` + in your request. + +[[dfs-query-and-fetch]] +==== Dfs, Query And Fetch + +Parameter value: *dfs_query_and_fetch*. + +Same as "Query And Fetch", except for an initial scatter phase which +goes and computes the distributed term frequencies for more accurate +scoring. + +[[dfs-query-then-fetch]] +==== Dfs, Query Then Fetch + +Parameter value: *dfs_query_then_fetch*. + +Same as "Query Then Fetch", except for an initial scatter phase which +goes and computes the distributed term frequencies for more accurate +scoring. + +[[count]] +==== Count + +Parameter value: *count*. + +A special search type that returns the count that matched the search +request without any docs (represented in `total_hits`), and possibly, +including facets as well. In general, this is preferable to the `count` +API as it provides more options. + +[[scan]] +==== Scan + +Parameter value: *scan*. + +The `scan` search type allows to efficiently scroll a large result set. +It's used first by executing a search request with scrolling and a +query: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/_search?search_type=scan&scroll=10m&size=50' -d ' +{ + "query" : { + "match_all" : {} + } +} +' +-------------------------------------------------- + +The `scroll` parameter control the keep alive time of the scrolling +request and initiates the scrolling process. The timeout applies per +round trip (i.e. between the previous scan scroll request, to the next). + +The response will include no hits, with two important results, the +`total_hits` will include the total hits that match the query, and the +`scroll_id` that allows to start the scroll process. From this stage, +the `_search/scroll` endpoint should be used to scroll the hits, feeding +the next scroll request with the previous search result `scroll_id`. For +example: + +[source,js] +-------------------------------------------------- +curl -XGET 'localhost:9200/_search/scroll?scroll=10m' -d 'c2NhbjsxOjBLMzdpWEtqU2IyZHlmVURPeFJOZnc7MzowSzM3aVhLalNiMmR5ZlVET3hSTmZ3OzU6MEszN2lYS2pTYjJkeWZVRE94Uk5mdzsyOjBLMzdpWEtqU2IyZHlmVURPeFJOZnc7NDowSzM3aVhLalNiMmR5ZlVET3hSTmZ3Ow==' +-------------------------------------------------- + +Scroll requests will include a number of hits equal to the size +multiplied by the number of primary shards. + +The "breaking" condition out of a scroll is when no hits has been +returned. The total_hits will be maintained between scroll requests. + +Note, scan search type does not support sorting (either on score or a +field) or faceting. + +[[clear-scroll]] +===== Clear scroll api + +Besides consuming the scroll search until no hits has been returned a scroll +search can also be aborted by deleting the `scroll_id`. This can be done via +the clear scroll api. When the `scroll_id` has been deleted all the +resources to keep the view open will be released. Example usage: + +[source,js] +-------------------------------------------------- +curl -XDELETE 'localhost:9200/_search/scroll/c2NhbjsxOjBLMzdpWEtqU2IyZHlmVURPeFJOZnc7MzowSzM3aVhLalNiMmR5ZlVET3hSTmZ3OzU6MEszN2lYS2pTYjJkeWZVRE94Uk5mdzsyOjBLMzdpWEtqU2IyZHlmVURPeFJOZnc7NDowSzM3aVhLalNiMmR5ZlVET3hSTmZ3Ow==' +-------------------------------------------------- + +Multiple scroll ids can be specified in a comma separated manner. +If all scroll ids need to be cleared the reserved `_all` value can used instead of an actual `scroll_id`: + +[source,js] +-------------------------------------------------- +curl -XDELETE 'localhost:9200/_search/scroll/_all' +-------------------------------------------------- diff --git a/docs/reference/search/request/sort.asciidoc b/docs/reference/search/request/sort.asciidoc new file mode 100644 index 0000000..fa3d591 --- /dev/null +++ b/docs/reference/search/request/sort.asciidoc @@ -0,0 +1,319 @@ +[[search-request-sort]] +=== Sort + +Allows to add one or more sort on specific fields. Each sort can be +reversed as well. The sort is defined on a per field level, with special +field name for `_score` to sort by score. + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { "post_date" : {"order" : "asc"}}, + "user", + { "name" : "desc" }, + { "age" : "desc" }, + "_score" + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +==== Sort Values + +The sort values for each document returned are also returned as part of +the response. + +==== Sort mode option + +Elasticsearch supports sorting by array or multi-valued fields. The `mode` option +controls what array value is picked for sorting the document it belongs +to. The `mode` option can have the following values: + +[horizontal] +`min`:: Pick the lowest value. +`max`:: Pick the highest value. +`sum`:: Use the sum of all values as sort value. Only applicable for + number based array fields. +`avg`:: Use the average of all values as sort value. Only applicable + for number based array fields. + +===== Sort mode example usage + +In the example below the field price has multiple prices per document. +In this case the result hits will be sort by price ascending based on +the average price per document. + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/_search' -d '{ + "query" : { + ... + }, + "sort" : [ + {"price" : {"order" : "asc", "mode" : "avg"}} + ] +}' +-------------------------------------------------- + +==== Sorting within nested objects. + +Elasticsearch also supports sorting by +fields that are inside one or more nested objects. The sorting by nested +field support has the following parameters on top of the already +existing sort options: + +`nested_path`:: + Defines the on what nested object to sort. The actual + sort field must be a direct field inside this nested object. The default + is to use the most immediate inherited nested object from the sort + field. + +`nested_filter`:: + A filter the inner objects inside the nested path + should match with in order for its field values to be taken into account + by sorting. Common case is to repeat the query / filter inside the + nested filter or query. By default no `nested_filter` is active. + +===== Nested sorting example + +In the below example `offer` is a field of type `nested`. Because +`offer` is the closest inherited nested field, it is picked as +`nested_path`. Only the inner objects that have color blue will +participate in sorting. + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/_search' -d '{ + "query" : { + ... + }, + "sort" : [ + { + "offer.price" : { + "mode" : "avg", + "order" : "asc", + "nested_filter" : { + "term" : { "offer.color" : "blue" } + } + } + } + ] +}' +-------------------------------------------------- + +Nested sorting is also supported when sorting by +scripts and sorting by geo distance. + +==== Missing Values + +The `missing` parameter specifies how docs which are missing +the field should be treated: The `missing` value can be +set to `_last`, `_first`, or a custom value (that +will be used for missing docs as the sort value). For example: + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { "price" : {"missing" : "_last"} }, + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +NOTE: If a nested inner object doesn't match with +the `nested_filter` then a missing value is used. + +==== Ignoring Unmapped Fields + +By default, the search request will fail if there is no mapping +associated with a field. The `ignore_unmapped` option allows to ignore +fields that have no mapping and not sort by them. Here is an example of +how it can be used: + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { "price" : {"ignore_unmapped" : true} }, + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +==== Geo Distance Sorting + +Allow to sort by `_geo_distance`. Here is an example: + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { + "_geo_distance" : { + "pin.location" : [-70, 40], + "order" : "asc", + "unit" : "km" + } + } + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +Note: the geo distance sorting supports `sort_mode` options: `min`, +`max` and `avg`. + +The following formats are supported in providing the coordinates: + +===== Lat Lon as Properties + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { + "_geo_distance" : { + "pin.location" : { + "lat" : 40, + "lon" : -70 + }, + "order" : "asc", + "unit" : "km" + } + } + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +===== Lat Lon as String + +Format in `lat,lon`. + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { + "_geo_distance" : { + "pin.location" : "-70,40", + "order" : "asc", + "unit" : "km" + } + } + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +===== Geohash + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { + "_geo_distance" : { + "pin.location" : "drm3btev3e86", + "order" : "asc", + "unit" : "km" + } + } + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +===== Lat Lon as Array + +Format in `[lon, lat]`, note, the order of lon/lat here in order to +conform with http://geojson.org/[GeoJSON]. + +[source,js] +-------------------------------------------------- +{ + "sort" : [ + { + "_geo_distance" : { + "pin.location" : [-70, 40], + "order" : "asc", + "unit" : "km" + } + } + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +==== Script Based Sorting + +Allow to sort based on custom scripts, here is an example: + +[source,js] +-------------------------------------------------- +{ + "query" : { + .... + }, + "sort" : { + "_script" : { + "script" : "doc['field_name'].value * factor", + "type" : "number", + "params" : { + "factor" : 1.1 + }, + "order" : "asc" + } + } +} +-------------------------------------------------- + +Note, it is recommended, for single custom based script based sorting, +to use `function_score` query instead as sorting based on score is faster. + +==== Track Scores + +When sorting on a field, scores are not computed. By setting +`track_scores` to true, scores will still be computed and tracked. + +[source,js] +-------------------------------------------------- +{ + "track_scores": true, + "sort" : [ + { "post_date" : {"reverse" : true} }, + { "name" : "desc" }, + { "age" : "desc" } + ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +==== Memory Considerations + +When sorting, the relevant sorted field values are loaded into memory. +This means that per shard, there should be enough memory to contain +them. For string based types, the field sorted on should not be analyzed +/ tokenized. For numeric types, if possible, it is recommended to +explicitly set the type to six_hun types (like `short`, `integer` and +`float`). diff --git a/docs/reference/search/request/source-filtering.asciidoc b/docs/reference/search/request/source-filtering.asciidoc new file mode 100644 index 0000000..7b81742 --- /dev/null +++ b/docs/reference/search/request/source-filtering.asciidoc @@ -0,0 +1,65 @@ +[[search-request-source-filtering]] +=== Source filtering + +added[1.0.0.Beta1] + + +Allows to control how the `_source` field is returned with every hit. + +By default operations return the contents of the `_source` field unless +you have used the `fields` parameter or if the `_source` field is disabled. + +You can turn off `_source` retrieval by using the `_source` parameter: + +To disable `_source` retrieval set to `false`: + +[source,js] +-------------------------------------------------- +{ + "_source": false, + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +The `_source` also accepts one or more wildcard patterns to control what parts of the `_source` should be returned: + +For example: + +[source,js] +-------------------------------------------------- +{ + "_source": "obj.*", + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +Or + +[source,js] +-------------------------------------------------- +{ + "_source": [ "obj1.*", "obj2.*" ], + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- + +Finally, for complete control, you can specify both include and exclude patterns: + +[source,js] +-------------------------------------------------- +{ + "_source": { + "include": [ "obj1.*", "obj2.*" ], + "exclude": [ "*.description" ], + } + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/request/version.asciidoc b/docs/reference/search/request/version.asciidoc new file mode 100644 index 0000000..3b2329a --- /dev/null +++ b/docs/reference/search/request/version.asciidoc @@ -0,0 +1,14 @@ +[[search-request-version]] +=== Version + +Returns a version for each search hit. + +[source,js] +-------------------------------------------------- +{ + "version": true, + "query" : { + "term" : { "user" : "kimchy" } + } +} +-------------------------------------------------- diff --git a/docs/reference/search/search.asciidoc b/docs/reference/search/search.asciidoc new file mode 100644 index 0000000..5483c19 --- /dev/null +++ b/docs/reference/search/search.asciidoc @@ -0,0 +1,52 @@ +[[search-search]] +== Search + +The search API allows to execute a search query and get back search hits +that match the query. The query can either be provided using a simple +<<search-uri-request,query string as a parameter>>, or using a +<<search-request-body,request body>>. + +["float",id="search-multi-index-type"] +=== Multi-Index, Multi-Type + +All search APIs can be applied across multiple types within an index, and +across multiple indices with support for the +<<multi-index,multi index syntax>>. For +example, we can search on all documents across all types within the +twitter index: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/_search?q=user:kimchy' +-------------------------------------------------- + +We can also search within specific types: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/tweet,user/_search?q=user:kimchy' +-------------------------------------------------- + +We can also search all tweets with a certain tag across several indices +(for example, when each user has his own index): + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/kimchy,elasticsearch/tweet/_search?q=tag:wow' +-------------------------------------------------- + +Or we can search all tweets across all available indices using `_all` +placeholder: + +[source,js] +-------------------------------------------------- +$ curl - XGET 'http://localhost:9200/_all/tweet/_search?q=tag:wow' +-------------------------------------------------- + +Or even search across all indices and all types: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/_search?q=tag:wow' +-------------------------------------------------- + diff --git a/docs/reference/search/suggesters.asciidoc b/docs/reference/search/suggesters.asciidoc new file mode 100644 index 0000000..e753927 --- /dev/null +++ b/docs/reference/search/suggesters.asciidoc @@ -0,0 +1,275 @@ +[[search-suggesters]] +== Suggesters + +The suggest feature suggests similar looking terms based on a provided +text by using a suggester. Parts of the suggest feature are still under +development. + +The suggest request part is either defined alongside the query part in a +`_search` request or via the REST `_suggest` endpoint. + +[source,js] +-------------------------------------------------- +curl -s -XPOST 'localhost:9200/_search' -d '{ + "query" : { + ... + }, + "suggest" : { + ... + } +}' +-------------------------------------------------- + +Suggest requests executed against the `_suggest` endpoint should omit +the surrounding `suggest` element which is only used if the suggest +request is part of a search. + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/_suggest' -d '{ + "my-suggestion" : { + "text" : "the amsterdma meetpu", + "term" : { + "field" : "body" + } + } +}' +-------------------------------------------------- + +Several suggestions can be specified per request. Each suggestion is +identified with an arbitrary name. In the example below two suggestions +are requested. Both `my-suggest-1` and `my-suggest-2` suggestions use +the `term` suggester, but have a different `text`. + +[source,js] +-------------------------------------------------- +"suggest" : { + "my-suggest-1" : { + "text" : "the amsterdma meetpu", + "term" : { + "field" : "body" + } + }, + "my-suggest-2" : { + "text" : "the rottredam meetpu", + "term" : { + "field" : "title", + } + } +} +-------------------------------------------------- + +The below suggest response example includes the suggestion response for +`my-suggest-1` and `my-suggest-2`. Each suggestion part contains +entries. Each entry is effectively a token from the suggest text and +contains the suggestion entry text, the original start offset and length +in the suggest text and if found an arbitrary number of options. + +[source,js] +-------------------------------------------------- +{ + ... + "suggest": { + "my-suggest-1": [ + { + "text" : "amsterdma", + "offset": 4, + "length": 9, + "options": [ + ... + ] + }, + ... + ], + "my-suggest-2" : [ + ... + ] + } + ... +} +-------------------------------------------------- + +Each options array contains an option object that includes the +suggested text, its document frequency and score compared to the suggest +entry text. The meaning of the score depends on the used suggester. The +term suggester's score is based on the edit distance. + +[source,js] +-------------------------------------------------- +"options": [ + { + "text": "amsterdam", + "freq": 77, + "score": 0.8888889 + }, + ... +] +-------------------------------------------------- + +[float] +[[global-suggest]] +=== Global suggest text + +To avoid repetition of the suggest text, it is possible to define a +global text. In the example below the suggest text is defined globally +and applies to the `my-suggest-1` and `my-suggest-2` suggestions. + +[source,js] +-------------------------------------------------- +"suggest" : { + "text" : "the amsterdma meetpu" + "my-suggest-1" : { + "term" : { + "field" : "title" + } + }, + "my-suggest-2" : { + "term" : { + "field" : "body" + } + } +} +-------------------------------------------------- + +The suggest text can in the above example also be specified as +suggestion specific option. The suggest text specified on suggestion +level override the suggest text on the global level. + +[float] +=== Other suggest example. + +In the below example we request suggestions for the following suggest +text: `devloping distibutd saerch engies` on the `title` field with a +maximum of 3 suggestions per term inside the suggest text. Note that in +this example we use the `count` search type. This isn't required, but a +nice optimization. The suggestions are gather in the `query` phase and +in the case that we only care about suggestions (so no hits) we don't +need to execute the `fetch` phase. + +[source,js] +-------------------------------------------------- +curl -s -XPOST 'localhost:9200/_search?search_type=count' -d '{ + "suggest" : { + "my-title-suggestions-1" : { + "text" : "devloping distibutd saerch engies", + "term" : { + "size" : 3, + "field" : "title" + } + } + } +}' +-------------------------------------------------- + +The above request could yield the response as stated in the code example +below. As you can see if we take the first suggested options of each +suggestion entry we get `developing distributed search engines` as +result. + +[source,js] +-------------------------------------------------- +{ + ... + "suggest": { + "my-title-suggestions-1": [ + { + "text": "devloping", + "offset": 0, + "length": 9, + "options": [ + { + "text": "developing", + "freq": 77, + "score": 0.8888889 + }, + { + "text": "deloping", + "freq": 1, + "score": 0.875 + }, + { + "text": "deploying", + "freq": 2, + "score": 0.7777778 + } + ] + }, + { + "text": "distibutd", + "offset": 10, + "length": 9, + "options": [ + { + "text": "distributed", + "freq": 217, + "score": 0.7777778 + }, + { + "text": "disributed", + "freq": 1, + "score": 0.7777778 + }, + { + "text": "distribute", + "freq": 1, + "score": 0.7777778 + } + ] + }, + { + "text": "saerch", + "offset": 20, + "length": 6, + "options": [ + { + "text": "search", + "freq": 1038, + "score": 0.8333333 + }, + { + "text": "smerch", + "freq": 3, + "score": 0.8333333 + }, + { + "text": "serch", + "freq": 2, + "score": 0.8 + } + ] + }, + { + "text": "engies", + "offset": 27, + "length": 6, + "options": [ + { + "text": "engines", + "freq": 568, + "score": 0.8333333 + }, + { + "text": "engles", + "freq": 3, + "score": 0.8333333 + }, + { + "text": "eggies", + "freq": 1, + "score": 0.8333333 + } + ] + } + ] + } + ... +} +-------------------------------------------------- + +include::suggesters/term-suggest.asciidoc[] + +include::suggesters/phrase-suggest.asciidoc[] + +include::suggesters/completion-suggest.asciidoc[] + + diff --git a/docs/reference/search/suggesters/completion-suggest.asciidoc b/docs/reference/search/suggesters/completion-suggest.asciidoc new file mode 100644 index 0000000..41da0b5 --- /dev/null +++ b/docs/reference/search/suggesters/completion-suggest.asciidoc @@ -0,0 +1,231 @@ +[[search-suggesters-completion]] +=== Completion Suggester + +NOTE: In order to understand the format of suggestions, please +read the <<search-suggesters>> page first. + +The `completion` suggester is a so-called prefix suggester. It does not +do spell correction like the `term` or `phrase` suggesters but allows +basic `auto-complete` functionality. + +==== Why another suggester? Why not prefix queries? + +The first question which comes to mind when reading about a prefix +suggestion is, why you should use it all, if you have prefix queries +already. The answer is simple: Prefix suggestions are fast. + +The data structures are internally backed by Lucenes +`AnalyzingSuggester`, which uses FSTs to execute suggestions. Usually +these data structures are costly to create, stored in-memory and need to +be rebuilt every now and then to reflect changes in your indexed +documents. The `completion` suggester circumvents this by storing the +FST as part of your index during index time. This allows for really fast +loads and executions. + +[[completion-suggester-mapping]] +==== Mapping + +In order to use this feature, you have to specify a special mapping for +this field, which enables the special storage of the field. + +[source,js] +-------------------------------------------------- +curl -X PUT localhost:9200/music +curl -X PUT localhost:9200/music/song/_mapping -d '{ + "song" : { + "properties" : { + "name" : { "type" : "string" }, + "suggest" : { "type" : "completion", + "index_analyzer" : "simple", + "search_analyzer" : "simple", + "payloads" : true + } + } + } +}' +-------------------------------------------------- + +Mapping supports the following parameters: + +`index_analyzer`:: + The index analyzer to use, defaults to `simple`. + +`search_analyzer`:: + The search analyzer to use, defaults to `simple`. + In case you are wondering why we did not opt for the `standard` + analyzer: We try to have easy to understand behaviour here, and if you + index the field content `At the Drive-in`, you will not get any + suggestions for `a`, nor for `d` (the first non stopword). + + +`payloads`:: + Enables the storing of payloads, defaults to `false` + +`preserve_separators`:: + Preserves the separators, defaults to `true`. + If disabled, you could find a field starting with `Foo Fighters`, if you + suggest for `foof`. + +`preserve_position_increments`:: + Enables position increments, defaults + to `true`. If disabled and using stopwords analyzer, you could get a + field starting with `The Beatles`, if you suggest for `b`. *Note*: You + could also achieve this by indexing two inputs, `Beatles` and + `The Beatles`, no need to change a simple analyzer, if you are able to + enrich your data. + +`max_input_length`:: + Limits the length of a single input, defaults to `50` UTF-16 code points. + This limit is only used at index time to reduce the total number of + characters per input string in order to prevent massive inputs from + bloating the underlying datastructure. The most usecases won't be influenced + by the default value since prefix completions hardly grow beyond prefixes longer + than a handful of characters. (Old name "max_input_len" is deprecated) + +[[indexing]] +==== Indexing + +[source,js] +-------------------------------------------------- +curl -X PUT 'localhost:9200/music/song/1?refresh=true' -d '{ + "name" : "Nevermind", + "suggest" : { + "input": [ "Nevermind", "Nirvana" ], + "output": "Nirvana - Nevermind", + "payload" : { "artistId" : 2321 }, + "weight" : 34 + } +}' +-------------------------------------------------- + +The following parameters are supported: + +`input`:: + The input to store, this can be a an array of strings or just + a string. This field is mandatory. + +`output`:: + The string to return, if a suggestion matches. This is very + useful to normalize outputs (i.e. have them always in the format + `artist - songname`). The result is de-duplicated if several documents + have the same output, i.e. only one is returned as part of the + suggest result. This is optional. + +`payload`:: + An arbitrary JSON object, which is simply returned in the + suggest option. You could store data like the id of a document, in order + to load it from elasticsearch without executing another search (which + might not yield any results, if `input` and `output` differ strongly). + +`weight`:: + A positive integer, which defines a weight and allows you to + rank your suggestions. This field is optional. + +NOTE: Even though you are losing most of the features of the +completion suggest, you can opt in for the shortest form, which even +allows you to use inside of multi fields. But keep in mind, that you will +not be able to use several inputs, an output, payloads or weights. + +[source,js] +-------------------------------------------------- +{ + "suggest" : "Nirvana" +} +-------------------------------------------------- + +NOTE: The suggest data structure might not reflect deletes on +documents immediately. You may need to do an <<indices-optimize>> for that. +You can call optimize with the `only_expunge_deletes=true` to only cater for deletes +or alternatively call a <<index-modules-merge>> operation. + +[[querying]] +==== Querying + +Suggesting works as usual, except that you have to specify the suggest +type as `completion`. + +[source,js] +-------------------------------------------------- +curl -X POST 'localhost:9200/music/_suggest?pretty' -d '{ + "song-suggest" : { + "text" : "n", + "completion" : { + "field" : "suggest" + } + } +}' + +{ + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0 + }, + "song-suggest" : [ { + "text" : "n", + "offset" : 0, + "length" : 4, + "options" : [ { + "text" : "Nirvana - Nevermind", + "score" : 34.0, "payload" : {"artistId":2321} + } ] + } ] +} +-------------------------------------------------- + +As you can see, the payload is included in the response, if configured +appropriately. If you configured a weight for a suggestion, this weight +is used as `score`. Also the `text` field uses the `output` of your +indexed suggestion, if configured, otherwise the matched part of the +`input` field. + + +[[fuzzy]] +==== Fuzzy queries + +The completion suggester also supports fuzzy queries - this means, +you can actually have a typo in your search and still get results back. + +[source,js] +-------------------------------------------------- +curl -X POST 'localhost:9200/music/_suggest?pretty' -d '{ + "song-suggest" : { + "text" : "n", + "completion" : { + "field" : "suggest", + "fuzzy" : { + "fuzziness" : 2 + } + } + } +}' +-------------------------------------------------- + +The fuzzy query can take specific fuzzy parameters. +The following parameters are supported: + +[horizontal] +`fuzziness`:: + The fuzziness factor, defaults to `AUTO`. + See <<fuzziness>> for allowed settings. + +`transpositions`:: + Sets if transpositions should be counted + as one or two changes, defaults to `true` + +`min_length`:: + Minimum length of the input before fuzzy + suggestions are returned, defaults `3` + +`prefix_length`:: + Minimum length of the input, which is not + checked for fuzzy alternatives, defaults to `1` + +`unicode_aware`:: + Sets all are measurements (like edit distance, + transpositions and lengths) in unicode code points + (actual letters) instead of bytes. + +NOTE: If you want to stick with the default values, but + still use fuzzy, you can either use `fuzzy: {}` + or `fuzzy: true`. diff --git a/docs/reference/search/suggesters/phrase-suggest.asciidoc b/docs/reference/search/suggesters/phrase-suggest.asciidoc new file mode 100644 index 0000000..3dc305a --- /dev/null +++ b/docs/reference/search/suggesters/phrase-suggest.asciidoc @@ -0,0 +1,319 @@ +[[search-suggesters-phrase]] +=== Phrase Suggester + +NOTE: In order to understand the format of suggestions, please +read the <<search-suggesters>> page first. + +The `term` suggester provides a very convenient API to access word +alternatives on a per token basis within a certain string distance. The API +allows accessing each token in the stream individually while +suggest-selection is left to the API consumer. Yet, often pre-selected +suggestions are required in order to present to the end-user. The +`phrase` suggester adds additional logic on top of the `term` suggester +to select entire corrected phrases instead of individual tokens weighted +based on `ngram-langugage` models. In practice it this suggester will be +able to make better decision about which tokens to pick based on +co-occurence and frequencies. + +==== API Example + +The `phrase` request is defined along side the query part in the json +request: + +[source,js] +-------------------------------------------------- +curl -XPOST 'localhost:9200/_search' -d { + "suggest" : { + "text" : "Xor the Got-Jewel", + "simple_phrase" : { + "phrase" : { + "analyzer" : "body", + "field" : "bigram", + "size" : 1, + "real_word_error_likelihood" : 0.95, + "max_errors" : 0.5, + "gram_size" : 2, + "direct_generator" : [ { + "field" : "body", + "suggest_mode" : "always", + "min_word_length" : 1 + } ], + "highlight": { + "pre_tag": "<em>", + "post_tag": "</em>" + } + } + } + } +} +-------------------------------------------------- + +The response contains suggestions scored by the most likely spell +correction first. In this case we received the expected correction +`xorr the god jewel` first while the second correction is less +conservative where only one of the errors is corrected. Note, the +request is executed with `max_errors` set to `0.5` so 50% of the terms +can contain misspellings (See parameter descriptions below). + +[source,js] +-------------------------------------------------- + { + "took" : 5, + "timed_out" : false, + "_shards" : { + "total" : 5, + "successful" : 5, + "failed" : 0 + }, + "hits" : { + "total" : 2938, + "max_score" : 0.0, + "hits" : [ ] + }, + "suggest" : { + "simple_phrase" : [ { + "text" : "Xor the Got-Jewel", + "offset" : 0, + "length" : 17, + "options" : [ { + "text" : "xorr the god jewel", + "highlighted": "<em>xorr</em> the <em>god</em> jewel", + "score" : 0.17877324 + }, { + "text" : "xor the god jewel", + "highlighted": "xor the <em>god</em> jewel", + "score" : 0.14231323 + } ] + } ] + } +} +-------------------------------------------------- + +==== Basic Phrase suggest API parameters + +[horizontal] +`field`:: + the name of the field used to do n-gram lookups for the + language model, the suggester will use this field to gain statistics to + score corrections. This field is mandatory. + +`gram_size`:: + sets max size of the n-grams (shingles) in the `field`. + If the field doesn't contain n-grams (shingles) this should be omitted + or set to `1`. Note that Elasticsearch tries to detect the gram size + based on the specified `field`. If the field uses a `shingle` filter the + `gram_size` is set to the `max_shingle_size` if not explicitly set. + +`real_word_error_likelihood`:: + the likelihood of a term being a + misspelled even if the term exists in the dictionary. The default it + `0.95` corresponding to 5% or the real words are misspelled. + + +`confidence`:: + The confidence level defines a factor applied to the + input phrases score which is used as a threshold for other suggest + candidates. Only candidates that score higher than the threshold will be + included in the result. For instance a confidence level of `1.0` will + only return suggestions that score higher than the input phrase. If set + to `0.0` the top N candidates are returned. The default is `1.0`. + +`max_errors`:: + the maximum percentage of the terms that at most + considered to be misspellings in order to form a correction. This method + accepts a float value in the range `[0..1)` as a fraction of the actual + query terms a number `>=1` as an absolute number of query terms. The + default is set to `1.0` which corresponds to that only corrections with + at most 1 misspelled term are returned. Note that setting this too high + can negativly impact performance. Low values like `1` or `2` are recommended + otherwise the time spend in suggest calls might exceed the time spend in + query execution. + +`separator`:: + the separator that is used to separate terms in the + bigram field. If not set the whitespace character is used as a + separator. + +`size`:: + the number of candidates that are generated for each + individual query term Low numbers like `3` or `5` typically produce good + results. Raising this can bring up terms with higher edit distances. The + default is `5`. + +`analyzer`:: + Sets the analyzer to analyse to suggest text with. + Defaults to the search analyzer of the suggest field passed via `field`. + +`shard_size`:: + Sets the maximum number of suggested term to be + retrieved from each individual shard. During the reduce phase, only the + top N suggestions are returned based on the `size` option. Defaults to + `5`. + +`text`:: + Sets the text / query to provide suggestions for. + +`highlight`:: + Sets up suggestion highlighting. If not provided then + no `highlighted` field is returned. If provided must + contain exactly `pre_tag` and `post_tag` which are + wrapped around the changed tokens. If multiple tokens + in a row are changed the entire phrase of changed tokens + is wrapped rather than each token. + +==== Smoothing Models + +The `phrase` suggester supports multiple smoothing models to balance +weight between infrequent grams (grams (shingles) are not existing in +the index) and frequent grams (appear at least once in the index). + +[horizontal] +`stupid_backoff`:: + a simple backoff model that backs off to lower + order n-gram models if the higher order count is `0` and discounts the + lower order n-gram model by a constant factor. The default `discount` is + `0.4`. Stupid Backoff is the default model. + +`laplace`:: + a smoothing model that uses an additive smoothing where a + constant (typically `1.0` or smaller) is added to all counts to balance + weights, The default `alpha` is `0.5`. + +`linear_interpolation`:: + a smoothing model that takes the weighted + mean of the unigrams, bigrams and trigrams based on user supplied + weights (lambdas). Linear Interpolation doesn't have any default values. + All parameters (`trigram_lambda`, `bigram_lambda`, `unigram_lambda`) + must be supplied. + +==== Candidate Generators + +The `phrase` suggester uses candidate generators to produce a list of +possible terms per term in the given text. A single candidate generator +is similar to a `term` suggester called for each individual term in the +text. The output of the generators is subsequently scored in combination +with the candidates from the other terms to for suggestion candidates. + +Currently only one type of candidate generator is supported, the +`direct_generator`. The Phrase suggest API accepts a list of generators +under the key `direct_generator` each of the generators in the list are +called per term in the original text. + +==== Direct Generators + +The direct generators support the following parameters: + +[horizontal] +`field`:: + The field to fetch the candidate suggestions from. This is + an required option that either needs to be set globally or per + suggestion. + +`size`:: + The maximum corrections to be returned per suggest text token. + +`suggest_mode`:: + The suggest mode controls what suggestions are + included or controls for what suggest text terms, suggestions should be + suggested. Three possible values can be specified: + ** `missing`: Only suggest terms in the suggest text that aren't in the + index. This is the default. + ** `popular`: Only suggest suggestions that occur in more docs then the + original suggest text term. + ** `always`: Suggest any matching suggestions based on terms in the + suggest text. + +`max_edits`:: + The maximum edit distance candidate suggestions can have + in order to be considered as a suggestion. Can only be a value between 1 + and 2. Any other value result in an bad request error being thrown. + Defaults to 2. + +`prefix_length`:: + The number of minimal prefix characters that must + match in order be a candidate suggestions. Defaults to 1. Increasing + this number improves spellcheck performance. Usually misspellings don't + occur in the beginning of terms. (Old name "prefix_len" is deprecated) + +`min_word_length`:: + The minimum length a suggest text term must have in + order to be included. Defaults to 4. (Old name "min_word_len" is deprecated) + +`max_inspections`:: + A factor that is used to multiply with the + `shards_size` in order to inspect more candidate spell corrections on + the shard level. Can improve accuracy at the cost of performance. + Defaults to 5. + +`min_doc_freq`:: + The minimal threshold in number of documents a + suggestion should appear in. This can be specified as an absolute number + or as a relative percentage of number of documents. This can improve + quality by only suggesting high frequency terms. Defaults to 0f and is + not enabled. If a value higher than 1 is specified then the number + cannot be fractional. The shard level document frequencies are used for + this option. + +`max_term_freq`:: + The maximum threshold in number of documents a + suggest text token can exist in order to be included. Can be a relative + percentage number (e.g 0.4) or an absolute number to represent document + frequencies. If an value higher than 1 is specified then fractional can + not be specified. Defaults to 0.01f. This can be used to exclude high + frequency terms from being spellchecked. High frequency terms are + usually spelled correctly on top of this also improves the spellcheck + performance. The shard level document frequencies are used for this + option. + +`pre_filter`:: + a filter (analyzer) that is applied to each of the + tokens passed to this candidate generator. This filter is applied to the + original token before candidates are generated. + +`post_filter`:: + a filter (analyzer) that is applied to each of the + generated tokens before they are passed to the actual phrase scorer. + +The following example shows a `phrase` suggest call with two generators, +the first one is using a field containing ordinary indexed terms and the +second one uses a field that uses terms indexed with a `reverse` filter +(tokens are index in reverse order). This is used to overcome the limitation +of the direct generators to require a constant prefix to provide +high-performance suggestions. The `pre_filter` and `post_filter` options +accept ordinary analyzer names. + +[source,js] +-------------------------------------------------- +curl -s -XPOST 'localhost:9200/_search' -d { + "suggest" : { + "text" : "Xor the Got-Jewel", + "simple_phrase" : { + "phrase" : { + "analyzer" : "body", + "field" : "bigram", + "size" : 4, + "real_word_error_likelihood" : 0.95, + "confidence" : 2.0, + "gram_size" : 2, + "direct_generator" : [ { + "field" : "body", + "suggest_mode" : "always", + "min_word_length" : 1 + }, { + "field" : "reverse", + "suggest_mode" : "always", + "min_word_length" : 1, + "pre_filter" : "reverse", + "post_filter" : "reverse" + } ] + } + } + } +} +-------------------------------------------------- + +`pre_filter` and `post_filter` can also be used to inject synonyms after +candidates are generated. For instance for the query `captain usq` we +might generate a candidate `usa` for term `usq` which is a synonym for +`america` which allows to present `captain america` to the user if this +phrase scores high enough. diff --git a/docs/reference/search/suggesters/term-suggest.asciidoc b/docs/reference/search/suggesters/term-suggest.asciidoc new file mode 100644 index 0000000..f6331c1 --- /dev/null +++ b/docs/reference/search/suggesters/term-suggest.asciidoc @@ -0,0 +1,110 @@ +[[search-suggesters-term]] +=== Term suggester + +NOTE: In order to understand the format of suggestions, please +read the <<search-suggesters>> page first. + +The `term` suggester suggests terms based on edit distance. The provided +suggest text is analyzed before terms are suggested. The suggested terms +are provided per analyzed suggest text token. The `term` suggester +doesn't take the query into account that is part of request. + +==== Common suggest options: + +[horizontal] +`text`:: + The suggest text. The suggest text is a required option that + needs to be set globally or per suggestion. + +`field`:: + The field to fetch the candidate suggestions from. This is + an required option that either needs to be set globally or per + suggestion. + +`analyzer`:: + The analyzer to analyse the suggest text with. Defaults + to the search analyzer of the suggest field. + +`size`:: + The maximum corrections to be returned per suggest text + token. + +`sort`:: + Defines how suggestions should be sorted per suggest text + term. Two possible values: ++ + ** `score`: Sort by sore first, then document frequency and + then the term itself. + ** `frequency`: Sort by document frequency first, then similarity + score and then the term itself. ++ +`suggest_mode`:: + The suggest mode controls what suggestions are + included or controls for what suggest text terms, suggestions should be + suggested. Three possible values can be specified: ++ + ** `missing`: Only suggest terms in the suggest text that aren't in + the index. This is the default. + ** `popular`: Only suggest suggestions that occur in more docs then + the original suggest text term. + ** `always`: Suggest any matching suggestions based on terms in the + suggest text. + +==== Other term suggest options: + +[horizontal] +`lowercase_terms`:: + Lower cases the suggest text terms after text analysis. + +`max_edits`:: + The maximum edit distance candidate suggestions can + have in order to be considered as a suggestion. Can only be a value + between 1 and 2. Any other value result in an bad request error being + thrown. Defaults to 2. + +`prefix_length`:: + The number of minimal prefix characters that must + match in order be a candidate suggestions. Defaults to 1. Increasing + this number improves spellcheck performance. Usually misspellings don't + occur in the beginning of terms. (Old name "prefix_len" is deprecated) + +`min_word_length`:: + The minimum length a suggest text term must have in + order to be included. Defaults to 4. (Old name "min_word_len" is deprecated) + +`shard_size`:: + Sets the maximum number of suggestions to be retrieved + from each individual shard. During the reduce phase only the top N + suggestions are returned based on the `size` option. Defaults to the + `size` option. Setting this to a value higher than the `size` can be + useful in order to get a more accurate document frequency for spelling + corrections at the cost of performance. Due to the fact that terms are + partitioned amongst shards, the shard level document frequencies of + spelling corrections may not be precise. Increasing this will make these + document frequencies more precise. + +`max_inspections`:: + A factor that is used to multiply with the + `shards_size` in order to inspect more candidate spell corrections on + the shard level. Can improve accuracy at the cost of performance. + Defaults to 5. + +`min_doc_freq`:: + The minimal threshold in number of documents a + suggestion should appear in. This can be specified as an absolute number + or as a relative percentage of number of documents. This can improve + quality by only suggesting high frequency terms. Defaults to 0f and is + not enabled. If a value higher than 1 is specified then the number + cannot be fractional. The shard level document frequencies are used for + this option. + +`max_term_freq`:: + The maximum threshold in number of documents a + suggest text token can exist in order to be included. Can be a relative + percentage number (e.g 0.4) or an absolute number to represent document + frequencies. If an value higher than 1 is specified then fractional can + not be specified. Defaults to 0.01f. This can be used to exclude high + frequency terms from being spellchecked. High frequency terms are + usually spelled correctly on top of this also improves the spellcheck + performance. The shard level document frequencies are used for this + option. diff --git a/docs/reference/search/uri-request.asciidoc b/docs/reference/search/uri-request.asciidoc new file mode 100644 index 0000000..e5d1dbe --- /dev/null +++ b/docs/reference/search/uri-request.asciidoc @@ -0,0 +1,101 @@ +[[search-uri-request]] +== URI Search + +A search request can be executed purely using a URI by providing request +parameters. Not all search options are exposed when executing a search +using this mode, but it can be handy for quick "curl tests". Here is an +example: + +[source,js] +-------------------------------------------------- +$ curl -XGET 'http://localhost:9200/twitter/tweet/_search?q=user:kimchy' +-------------------------------------------------- + +And here is a sample response: + +[source,js] +-------------------------------------------------- +{ + "_shards":{ + "total" : 5, + "successful" : 5, + "failed" : 0 + }, + "hits":{ + "total" : 1, + "hits" : [ + { + "_index" : "twitter", + "_type" : "tweet", + "_id" : "1", + "_source" : { + "user" : "kimchy", + "postDate" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" + } + } + ] + } +} +-------------------------------------------------- + +[float] +=== Parameters + +The parameters allowed in the URI are: + +[cols="<,<",options="header",] +|======================================================================= +|Name |Description +|`q` |The query string (maps to the `query_string` query, see +<<query-dsl-query-string-query,_Query String +Query_>> for more details). + +|`df` |The default field to use when no field prefix is defined within the +query. + +|`analyzer` |The analyzer name to be used when analyzing the query string. + +|`default_operator` |The default operator to be used, can be `AND` or +`OR`. Defaults to `OR`. + +|`explain` |For each hit, contain an explanation of how scoring of the +hits was computed. + +|`_source`| added[1.0.0.Beta1]Set to `false` to disable retrieval of the `_source` field. You can also retrieve +part of the document by using `_source_include` & `_source_exclude` (see the <<search-request-source-filtering, request body>> +documentation for more details) + +|`fields` |The selective stored fields of the document to return for each hit, +comma delimited. Not specifying any value will cause no fields to return. + +|`sort` |Sorting to perform. Can either be in the form of `fieldName`, or +`fieldName:asc`/`fieldName:desc`. The fieldName can either be an actual +field within the document, or the special `_score` name to indicate +sorting based on scores. There can be several `sort` parameters (order +is important). + +|`track_scores` |When sorting, set to `true` in order to still track +scores and return them as part of each hit. + +|`timeout` |A search timeout, bounding the search request to be executed +within the specified time value and bail with the hits accumulated up to +that point when expired. Defaults to no timeout. + +|`from` |The starting from index of the hits to return. Defaults to `0`. + +|`size` |The number of hits to return. Defaults to `10`. + +|`search_type` |The type of the search operation to perform. Can be +`dfs_query_then_fetch`, `dfs_query_and_fetch`, `query_then_fetch`, +`query_and_fetch`, `count`, `scan`. Defaults to `query_then_fetch`. See +<<search-request-search-type,_Search Type_>> for +more details on the different types of search that can be performed. + +|`lowercase_expanded_terms` |Should terms be automatically lowercased or +not. Defaults to `true`. + +|`analyze_wildcard` |Should wildcard and prefix queries be analyzed or +not. Defaults to `false`. +|======================================================================= + diff --git a/docs/reference/search/validate.asciidoc b/docs/reference/search/validate.asciidoc new file mode 100644 index 0000000..cdf9981 --- /dev/null +++ b/docs/reference/search/validate.asciidoc @@ -0,0 +1,77 @@ +[[search-validate]] +== Validate API + +The validate API allows a user to validate a potentially expensive query +without executing it. The following example shows how it can be used: + +[source,js] +-------------------------------------------------- +curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{ + "user" : "kimchy", + "post_date" : "2009-11-15T14:12:12", + "message" : "trying out Elasticsearch" +}' +-------------------------------------------------- + +When the query is valid, the response contains `valid:true`: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/_validate/query?q=user:foo' +{"valid":true,"_shards":{"total":1,"successful":1,"failed":0}} +-------------------------------------------------- + +Or, with a request body: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/_validate/query' -d '{ + "query" : { + "filtered" : { + "query" : { + "query_string" : { + "query" : "*:*" + } + }, + "filter" : { + "term" : { "user" : "kimchy" } + } + } + } +}' +{"valid":true,"_shards":{"total":1,"successful":1,"failed":0}} +-------------------------------------------------- + +NOTE: The query being sent in the body must be nested in a `query` key, same as +the <<search-search,search api>> works added[1.0.0.RC1,The query was previously the top-level object]. + +If the query is invalid, `valid` will be `false`. Here the query is +invalid because Elasticsearch knows the post_date field should be a date +due to dynamic mapping, and 'foo' does not correctly parse into a date: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/_validate/query?q=post_date:foo' +{"valid":false,"_shards":{"total":1,"successful":1,"failed":0}} +-------------------------------------------------- + +An `explain` parameter can be specified to get more detailed information +about why a query failed: + +[source,js] +-------------------------------------------------- +curl -XGET 'http://localhost:9200/twitter/tweet/_validate/query?q=post_date:foo&pretty=true&explain=true' +{ + "valid" : false, + "_shards" : { + "total" : 1, + "successful" : 1, + "failed" : 0 + }, + "explanations" : [ { + "index" : "twitter", + "valid" : false, + "error" : "org.elasticsearch.index.query.QueryParsingException: [twitter] Failed to parse; org.elasticsearch.ElasticsearchParseException: failed to parse date field [foo], tried both date format [dateOptionalTime], and timestamp number; java.lang.IllegalArgumentException: Invalid format: \"foo\"" + } ] +} +-------------------------------------------------- diff --git a/docs/reference/setup.asciidoc b/docs/reference/setup.asciidoc new file mode 100644 index 0000000..cf413cd --- /dev/null +++ b/docs/reference/setup.asciidoc @@ -0,0 +1,63 @@ +[[setup]] += Setup + +[partintro] +-- +This section includes information on how to setup *elasticsearch* and +get it running. If you haven't already, http://www.elasticsearch.org/download[download] it, and +then check the <<setup-installation,installation>> docs. + +NOTE: Elasticsearch can also be installed from our repositories using `apt` or `yum`. +See <<setup-repositories>>. + +[[setup-installation]] +[float] +== Installation + +After link:/download[downloading] the latest release and extracting it, +*elasticsearch* can be started using: + +[source,sh] +-------------------------------------------------- +$ bin/elasticsearch +-------------------------------------------------- + +Under *nix system, the command will start the process in the foreground. +To run it in the background, add the `-d` switch to it: + +[source,sh] +-------------------------------------------------- +$ bin/elasticsearch -d +-------------------------------------------------- + +Elasticsearch is built using Java, and requires at least +http://java.sun.com/javase/downloads/index.jsp[Java 6] in order to run. +The version of Java that will be used can be set by setting the +`JAVA_HOME` environment variable. + +.*NIX +************************************************************************* +There are added features when using the `elasticsearch` shell script. +The first, which was explained earlier, is the ability to easily run the +process either in the foreground or the background. + +Another feature is the ability to pass `-X` and `-D` or getopt long style +configuration parameters directly to the script. When set, all override +anything set using either `JAVA_OPTS` or `ES_JAVA_OPTS`. For example: + +[source,sh] +-------------------------------------------------- +$ bin/elasticsearch -Xmx2g -Xms2g -Des.index.store.type=memory --node.name=my-node +-------------------------------------------------- +************************************************************************* +-- + +include::setup/configuration.asciidoc[] + +include::setup/as-a-service.asciidoc[] + +include::setup/as-a-service-win.asciidoc[] + +include::setup/dir-layout.asciidoc[] + +include::setup/repositories.asciidoc[] diff --git a/docs/reference/setup/as-a-service-win.asciidoc b/docs/reference/setup/as-a-service-win.asciidoc new file mode 100644 index 0000000..f77f194 --- /dev/null +++ b/docs/reference/setup/as-a-service-win.asciidoc @@ -0,0 +1,63 @@ +[[setup-service-win]] +== Running as a Service on Windows + +Windows users can configure Elasticsearch to run as a service to run in the background or start automatically +at startup without any user interaction. +This can be achieved through `service.bat` script under `bin/` folder which allows one to install, +remove, manage or configure the service and potentially start and stop the service, all from the command-line. + +[source,sh] +-------------------------------------------------- +c:\elasticsearch-0.90.5\bin>service + +Usage: service.bat install|remove|start|stop|manager [SERVICE_ID] +-------------------------------------------------- + +The script requires one parameter (the command to execute) followed by an optional one indicating the service +id (useful when installing multiple Elasticsearch services). + +The commands available are: + +[horizontal] +`install`:: Install Elasticsearch as a service + +`remove`:: Remove the installed Elasticsearch service (and stop the service if started) + +`start`:: Start the Elasticsearch service (if installed) + +`stop`:: Stop the Elasticsearch service (if started) + +`manager`:: Start a GUI for managing the installed service + +Note that the environment configuration options available during the installation are copied and will be used during +the service lifecycle. This means any changes made to them after the installation will not be picked up unless +the service is reinstalled. + +Based on the architecture of the available JDK/JRE (set through `JAVA_HOME`), the appropriate 64-bit(x64) or 32-bit(x86) +service will be installed. This information is made available during install: + +[source,sh] +-------------------------------------------------- +c:\elasticsearch-0.90.5\bin>service install +Installing service : "elasticsearch-service-x64" +Using JAVA_HOME (64-bit): "c:\jvm\jdk1.7" +The service 'elasticsearch-service-x64' has been installed. +-------------------------------------------------- + +NOTE: While a JRE can be used for the Elasticsearch service, due to its use of a client VM (as oppose to a server JVM which +offers better performance for long-running applications) its usage is discouraged and a warning will be issued. + +[float] +=== Customizing service settings + +There are two ways to customize the service settings: + +Manager GUI:: accessible through `manager` command, the GUI offers insight into the installed service including its status, startup type, +JVM, start and stop settings among other things. Simply invoking `service.bat` from the command-line with the aforementioned option +will open up the manager window: + +image::images/service-manager-win.png["Windows Service Manager GUI",align="center"] + +Customizing `service.bat`:: at its core, `service.bat` relies on http://commons.apache.org/proper/commons-daemon/[Apache Commons Daemon] project +to install the services. For full flexibility such as customizing the user under which the service runs, one can modify the installation +parameters to tweak all the parameters accordingly. Do note that this requires reinstalling the service for the new settings to be applied. diff --git a/docs/reference/setup/as-a-service.asciidoc b/docs/reference/setup/as-a-service.asciidoc new file mode 100644 index 0000000..71bf760 --- /dev/null +++ b/docs/reference/setup/as-a-service.asciidoc @@ -0,0 +1,86 @@ +[[setup-service]] +== Running As a Service on Linux + +In order to run elasticsearch as a service on your operating system, the provided packages try to make it as easy as possible for you to start and stop elasticsearch during reboot and upgrades. + +[float] +=== Linux + +Currently our build automatically creates a debian package and an RPM package, which is available on the download page. The package itself does not have any dependencies, but you have to make sure that you installed a JDK. + +Each package features a configuration file, which allows you to set the following parameters + +[horizontal] +`ES_USER`:: The user to run as, defaults to `elasticsearch` +`ES_GROUP`:: The group to run as, defaults to `elasticsearch` +`ES_HEAP_SIZE`:: The heap size to start with +`ES_HEAP_NEWSIZE`:: The size of the new generation heap +`ES_DIRECT_SIZE`:: The maximum size of the direct memory +`MAX_OPEN_FILES`:: Maximum number of open files, defaults to `65535` +`MAX_LOCKED_MEMORY`:: Maximum locked memory size. Set to "unlimited" if you use the bootstrap.mlockall option in elasticsearch.yml. You must also set ES_HEAP_SIZE. +`MAX_MAP_COUNT`:: Maximum number of memory map areas a process may have. If you use `mmapfs` as index store type, make sure this is set to a high value. For more information, check the https://github.com/torvalds/linux/blob/master/Documentation/sysctl/vm.txt[linux kernel documentation] about `max_map_count`. This is set via `sysctl` before starting elasticsearch. Defaults to `65535` +`LOG_DIR`:: Log directory, defaults to `/var/log/elasticsearch` +`DATA_DIR`:: Data directory, defaults to `/var/lib/elasticsearch` +`WORK_DIR`:: Work directory, defaults to `/tmp/elasticsearch` +`CONF_DIR`:: Configuration file directory (which needs to include `elasticsearch.yml` and `logging.yml` files), defaults to `/etc/elasticsearch` +`CONF_FILE`:: Path to configuration file, defaults to `/etc/elasticsearch/elasticsearch.yml` +`ES_JAVA_OPTS`:: Any additional java options you may want to apply. This may be useful, if you need to set the `node.name` property, but do not want to change the `elasticsearch.yml` configuration file, because it is distributed via a provisioning system like puppet or chef. Example: `ES_JAVA_OPTS="-Des.node.name=search-01"` +`RESTART_ON_UPGRADE`:: Configure restart on package upgrade, defaults to `false`. This means you will have to restart your elasticsearch instance after installing a package manually. The reason for this is to ensure, that upgrades in a cluster do not result in a continouos shard reallocation resulting in high network traffic and reducing the response times of your cluster. + +[float] +==== Debian/Ubuntu + +The debian package ships with everything you need as it uses standard debian tools like update `update-rc.d` to define the runlevels it runs on. The init script is placed at `/etc/init.d/elasticsearch` is you would expect it. The configuration file is placed at `/etc/default/elasticsearch`. + +The debian package does not start up the service by default. The reason for this is to prevent the instance to accidentally join a cluster, without being configured appropriately. After installing using `dpkg -i` you can use the following commands to ensure, that elasticsearch starts when the system is booted and then start up elasticsearch: + +[source,sh] +-------------------------------------------------- +sudo update-rc.d elasticsearch defaults 95 10 +sudo /etc/init.d/elasticsearch start +-------------------------------------------------- + +[float] +===== Installing the oracle JDK + +The usual recommendation is to run the Oracle JDK with elasticsearch. However Ubuntu and Debian only ship the OpenJDK due to license issues. You can easily install the oracle installer package though. In case you are missing the `add-apt-repository` command under Debian GNU/Linux, make sure have at least Debian Wheezy and the package `python-software-properties` installed + +[source,sh] +-------------------------------------------------- +sudo add-apt-repository ppa:webupd8team/java +sudo apt-get update +sudo apt-get install oracle-java7-installer +java -version +-------------------------------------------------- + +The last command should verify a successful installation of the Oracle JDK. + + +[float] +==== RPM based distributions + +[float] +===== Using chkconfig + +Some RPM based distributions are using `chkconfig` to enable and disable services. The init script is located at `/etc/init.d/elasticsearch`, where as the configuration file is placed at `/etc/sysconfig/elasticsearch`. Like the debian package the RPM package is not started by default after installation, you have to do this manually by entering the following commands + +[source,sh] +-------------------------------------------------- +sudo /sbin/chkconfig --add elasticsearch +sudo service elasticsearch start +-------------------------------------------------- + + +[float] +===== Using systemd + +Distributions like SUSE do not use the `chkconfig` tool to register services, but rather `systemd` and its command `/bin/systemctl` to start and stop services (at least in newer versions, otherwise use the `chkconfig` commands above). The configuration file is also placed at `/etc/sysconfig/elasticsearch`. After installing the RPM, you have to change the systemd configuration and then start up elasticsearch + +[source,sh] +-------------------------------------------------- +sudo /bin/systemctl daemon-reload +sudo /bin/systemctl enable elasticsearch.service +sudo /bin/systemctl start elasticsearch.service +-------------------------------------------------- + +Also note that changing the `MAX_MAP_COUNT` setting in `/etc/sysconfig/elasticsearch` does not have any effect, you will have to change it in `/usr/lib/sysctl.d/elasticsearch.conf` in order to have it applied at startup. diff --git a/docs/reference/setup/configuration.asciidoc b/docs/reference/setup/configuration.asciidoc new file mode 100644 index 0000000..885dd9f --- /dev/null +++ b/docs/reference/setup/configuration.asciidoc @@ -0,0 +1,237 @@ +[[setup-configuration]] +== Configuration + +[float] +=== Environment Variables + +Within the scripts, Elasticsearch comes with built in `JAVA_OPTS` passed +to the JVM started. The most important setting for that is the `-Xmx` to +control the maximum allowed memory for the process, and `-Xms` to +control the minimum allocated memory for the process (_in general, the +more memory allocated to the process, the better_). + +Most times it is better to leave the default `JAVA_OPTS` as they are, +and use the `ES_JAVA_OPTS` environment variable in order to set / change +JVM settings or arguments. + +The `ES_HEAP_SIZE` environment variable allows to set the heap memory +that will be allocated to elasticsearch java process. It will allocate +the same value to both min and max values, though those can be set +explicitly (not recommended) by setting `ES_MIN_MEM` (defaults to +`256m`), and `ES_MAX_MEM` (defaults to `1gb`). + +It is recommended to set the min and max memory to the same value, and +enable <<setup-configuration-memory,`mlockall`>>. + +[float] +[[system]] +=== System Configuration + +[float] +[[file-descriptors]] +==== File Descriptors + +Make sure to increase the number of open files descriptors on the +machine (or for the user running elasticsearch). Setting it to 32k or +even 64k is recommended. + +In order to test how many open files the process can open, start it with +`-Des.max-open-files` set to `true`. This will print the number of open +files the process can open on startup. + +Alternatively, you can retrieve the `max_file_descriptors` for each node +using the <<cluster-nodes-info>> API, with: + +[source,js] +-------------------------------------------------- +curl localhost:9200/_nodes/process?pretty +-------------------------------------------------- + + +[float] +[[setup-configuration-memory]] +==== Memory Settings + +There is an option to use +http://opengroup.org/onlinepubs/007908799/xsh/mlockall.html[mlockall] to +try to lock the process address space so it won't be swapped. For this +to work, the `bootstrap.mlockall` should be set to `true` and it is +recommended to set both the min and max memory allocation to be the +same. Note: This option is only available on Linux/Unix operating +systems. + +In order to see if this works or not, set the `common.jna` logging to +DEBUG level. A solution to "Unknown mlockall error 0" can be to set +`ulimit -l unlimited`. + +Note, `mlockall` might cause the JVM or shell +session to exit if it fails to allocate the memory (because not enough +memory is available on the machine). + +[float] +[[settings]] +=== Elasticsearch Settings + +*elasticsearch* configuration files can be found under `ES_HOME/config` +folder. The folder comes with two files, the `elasticsearch.yml` for +configuring Elasticsearch different +<<modules,modules>>, and `logging.yml` for +configuring the Elasticsearch logging. + +The configuration format is http://www.yaml.org/[YAML]. Here is an +example of changing the address all network based modules will use to +bind and publish to: + +[source,yaml] +-------------------------------------------------- +network : + host : 10.0.0.4 +-------------------------------------------------- + + +[float] +[[paths]] +==== Paths + +In production use, you will almost certainly want to change paths for +data and log files: + +[source,yaml] +-------------------------------------------------- +path: + logs: /var/log/elasticsearch + data: /var/data/elasticsearch +-------------------------------------------------- + +[float] +[[cluster-name]] +==== Cluster name + +Also, don't forget to give your production cluster a name, which is used +to discover and auto-join other nodes: + +[source,yaml] +-------------------------------------------------- +cluster: + name: <NAME OF YOUR CLUSTER> +-------------------------------------------------- + +[float] +[[node-name]] +==== Node name + +You may also want to change the default node name for each node to +something like the display hostname. By default Elasticsearch will +randomly pick a Marvel character name from a list of around 3000 names +when your node starts up. + +[source,yaml] +-------------------------------------------------- +node: + name: <NAME OF YOUR NODE> +-------------------------------------------------- + +Internally, all settings are collapsed into "namespaced" settings. For +example, the above gets collapsed into `node.name`. This means that +its easy to support other configuration formats, for example, +http://www.json.org[JSON]. If JSON is a preferred configuration format, +simply rename the `elasticsearch.yml` file to `elasticsearch.json` and +add: + +[float] +[[styles]] +==== Configuration styles + +[source,yaml] +-------------------------------------------------- +{ + "network" : { + "host" : "10.0.0.4" + } +} +-------------------------------------------------- + +It also means that its easy to provide the settings externally either +using the `ES_JAVA_OPTS` or as parameters to the `elasticsearch` +command, for example: + +[source,sh] +-------------------------------------------------- +$ elasticsearch -Des.network.host=10.0.0.4 +-------------------------------------------------- + +Another option is to set `es.default.` prefix instead of `es.` prefix, +which means the default setting will be used only if not explicitly set +in the configuration file. + +Another option is to use the `${...}` notation within the configuration +file which will resolve to an environment setting, for example: + +[source,js] +-------------------------------------------------- +{ + "network" : { + "host" : "${ES_NET_HOST}" + } +} +-------------------------------------------------- + +The location of the configuration file can be set externally using a +system property: + +[source,sh] +-------------------------------------------------- +$ elasticsearch -Des.config=/path/to/config/file +-------------------------------------------------- + +[float] +[[configuration-index-settings]] +=== Index Settings + +Indices created within the cluster can provide their own settings. For +example, the following creates an index with memory based storage +instead of the default file system based one (the format can be either +YAML or JSON): + +[source,sh] +-------------------------------------------------- +$ curl -XPUT http://localhost:9200/kimchy/ -d \ +' +index : + store: + type: memory +' +-------------------------------------------------- + +Index level settings can be set on the node level as well, for example, +within the `elasticsearch.yml` file, the following can be set: + +[source,yaml] +-------------------------------------------------- +index : + store: + type: memory +-------------------------------------------------- + +This means that every index that gets created on the specific node +started with the mentioned configuration will store the index in memory +*unless the index explicitly sets it*. In other words, any index level +settings override what is set in the node configuration. Of course, the +above can also be set as a "collapsed" setting, for example: + +[source,sh] +-------------------------------------------------- +$ elasticsearch -Des.index.store.type=memory +-------------------------------------------------- + +All of the index level configuration can be found within each +<<index-modules,index module>>. + +[float] +[[logging]] +=== Logging + +Elasticsearch uses an internal logging abstraction and comes, out of the +box, with http://logging.apache.org/log4j/[log4j]. It tries to simplify +log4j configuration by using http://www.yaml.org/[YAML] to configure it, +and the logging configuration file is `config/logging.yml` file. diff --git a/docs/reference/setup/dir-layout.asciidoc b/docs/reference/setup/dir-layout.asciidoc new file mode 100644 index 0000000..2971c45 --- /dev/null +++ b/docs/reference/setup/dir-layout.asciidoc @@ -0,0 +1,47 @@ +[[setup-dir-layout]] +== Directory Layout + +The directory layout of an installation is as follows: + +[cols="<,<,<,<",options="header",] +|======================================================================= +|Type |Description |Default Location |Setting +|*home* |Home of elasticsearch installation | | `path.home` + +|*bin* |Binary scripts including `elasticsearch` to start a node | `{path.home}/bin` | + +|*conf* |Configuration files including `elasticsearch.yml` |`{path.home}/config` |`path.conf` + +|*data* |The location of the data files of each index / shard allocated +on the node. Can hold multiple locations. |`{path.home}/data`|`path.data` + +|*work* |Temporal files that are used by different nodes. |`{path.home}/work` |`path.work` + +|*logs* |Log files location |`{path.home}/logs` |`path.logs` + +|*plugins* |Plugin files location. Each plugin will be contained in a subdirectory. |`{path.home}/plugins` |`path.plugins` +|======================================================================= + +The multiple data locations allows to stripe it. The striping is simple, +placing whole files in one of the locations, and deciding where to place +the file based on the value of the `index.store.distributor` setting: + +* `least_used` (default) always selects the directory with the most +available space + + * `random` selects directories at random. The probability of selecting +a particular directory is proportional to amount of available space in +this directory. + +Note, there are no multiple copies of the same data, in that, its +similar to RAID 0. Though simple, it should provide a good solution for +people that don't want to mess with RAID. Here is how it is configured: + +--------------------------------- +path.data: /mnt/first,/mnt/second +--------------------------------- + +Or the in an array format: + +---------------------------------------- +path.data: ["/mnt/first", "/mnt/second"] +---------------------------------------- diff --git a/docs/reference/setup/repositories.asciidoc b/docs/reference/setup/repositories.asciidoc new file mode 100644 index 0000000..aa0ae30 --- /dev/null +++ b/docs/reference/setup/repositories.asciidoc @@ -0,0 +1,52 @@ +[[setup-repositories]] +== Repositories + +We also have repositories available for APT and YUM based distributions. + +We have split the major versions in separate urls to avoid accidental upgrades across major version. +For all 0.90.x releases use 0.90 as version number, for 1.0.x use 1.0, etc. + +[float] +=== APT + +Download and install the Public Signing Key + +[source,sh] +-------------------------------------------------- +wget -O - http://packages.elasticsearch.org/GPG-KEY-elasticsearch | apt-key add - +-------------------------------------------------- + +Add the following to your /etc/apt/sources.list to enable the repository + +[source,sh] +-------------------------------------------------- +deb http://packages.elasticsearch.org/elasticsearch/0.90/debian stable main +-------------------------------------------------- + +Run apt-get update and the repository is ready for use. + + +[float] +=== YUM + +Download and install the Public Signing Key + +[source,sh] +-------------------------------------------------- +rpm --import http://packages.elasticsearch.org/GPG-KEY-elasticsearch +-------------------------------------------------- + +Add the following in your /etc/yum.repos.d/ directory + +[source,sh] +-------------------------------------------------- +[elasticsearch-0.90] +name=Elasticsearch repository for 0.90.x packages +baseurl=http://packages.elasticsearch.org/elasticsearch/0.90/centos +gpgcheck=1 +gpgkey=http://packages.elasticsearch.org/GPG-KEY-elasticsearch +enabled=1 +-------------------------------------------------- + +And your repository is ready for use. + diff --git a/docs/reference/testing.asciidoc b/docs/reference/testing.asciidoc new file mode 100644 index 0000000..fd1a460 --- /dev/null +++ b/docs/reference/testing.asciidoc @@ -0,0 +1,16 @@ +[[testing]] += Testing + +[partintro] +-- +This section is about utilizing elasticsearch as part of your testing infrastructure. + +[float] +[[testing-header]] +== Testing: + +* <<testing-framework>> + +-- + +include::testing/testing-framework.asciidoc[] diff --git a/docs/reference/testing/testing-framework.asciidoc b/docs/reference/testing/testing-framework.asciidoc new file mode 100644 index 0000000..3d9fa28 --- /dev/null +++ b/docs/reference/testing/testing-framework.asciidoc @@ -0,0 +1,230 @@ +[[testing-framework]] +== Java Testing Framework + +added[1.0.0.RC1] + +[[testing-intro]] + +Testing is a crucial part of your application, and as information retrieval itself is already a complex topic, there should not be any additional complexity in setting up a testing infrastructure, which uses elasticsearch. This is the main reason why we decided to release an additional file to the release, which allows you to use the same testing infrastructure we do in the elasticsearch core. The testing framework allows you to setup clusters with multiple nodes in order to check if your code covers everything needed to run in a cluster. The framework prevents you from writing complex code yourself to start, stop or manage several test nodes in a cluster. In addition there is another very important feature called randomized testing, which you are getting for free as it is part of the elasticsearch infrastructure. + + + +[[why-randomized-testing]] +=== why randomized testing? + +The key concept of randomized testing is not to use the same input values for every testcase, but still be able to reproduce it in case of a failure. This allows to test with vastly different input variables in order to make sure, that your implementation is actually independent from your provided test data. + +If you are interested in the implementation being used, check out the http://labs.carrotsearch.com/randomizedtesting.html[RandomizedTesting webpage]. + + +[[using-elasticsearch-test-classes]] +=== Using the elasticsearch test classes + +First, you need to include the testing dependency in your project. If you use maven and its `pom.xml` file, it looks like this + +[[source,xml]] +-------------------------------------------------- +<dependencies> + <dependency> + <groupId>org.apache.lucene</groupId> + <artifactId>lucene-test-framework</artifactId> + <version>${lucene.version}</version> + <scope>test</scope> + </dependency> + <dependency> + <groupId>org.elasticsearch</groupId> + <artifactId>elasticsearch</artifactId> + <version>${elasticsearch.version}</version> + <scope>test</scope> + <type>test-jar</type> + </dependency> + <dependency> + <groupId>org.elasticsearch</groupId> + <artifactId>elasticsearch</artifactId> + <version>${elasticsearch.version}</version> + <scope>test</scope> + </dependency> +</dependencies> +-------------------------------------------------- + +Replace the elasticsearch version and the lucene versions with the current elasticsearch version and its accompanying lucene release. + +There are already have a couple of classes, you can inherit from in your own test classes. The advantages of doing so is having already defined loggers, the whole randomized infrastructure is set up already. + + +[[unit-tests]] +=== unit tests + +In case you only need to execute a unit test, because your implementation can be isolated that good and does not require an up and running elasticsearch cluster, you can use the `ElasticsearchTestCase`. If you are testing lucene features, use `ElasticsearchLuceneTestCase` and if you are testing concrete token streams, use the `ElasticsearchTokenStreamTestCase` class. Those specific classes execute additional checks, which ensure that no resources leaks are happening, after the test has run. + + +[[integration-tests]] +=== integration tests + +These kind of tests require firing up a whole cluster of nodes, before the tests can actually be run. Compared to unit tests they are obviously way more time consuming, but the test infrastructure tries to minimize the time cost by only restarting the whole cluster, if this is configured explicitely. + +The class your tests have to inherit from is `ElasticsearchIntegrationTest`. As soon as you inherit, there is no need for you to start any elasticsearch nodes manually in your test anymore, though you might need to ensure that at least a certain amount of nodes is up running. + +[[helper-methods]] +==== generic helper methods + +There are a couple of helper methods in `ElasticsearchIntegrationTest`, which will make your tests shorter and more concise. + +[horizontal] +`refresh()`:: Refreshes all indices in a cluster +`ensureGreen()`:: Ensures a green health cluster state, waiting for relocations. Waits the default timeout of 30 seconds before failing. +`ensureYellow()`:: Ensures a yellow health cluster state, also waits for 30 seconds before failing. +`createIndex(name)`:: Creates an index with the specified name +`flush()`:: Flushes all indices in a cluster +`flushAndRefresh()`:: Combines `flush()` and `refresh()` calls +`optimize()`:: Waits for all relocations and optimized all indices in the cluster to one segment. +`indexExists(name)`:: Checks if given index exists +`admin()`:: Returns an `AdminClient` for administrative tasks +`clusterService()`:: Returns the cluster service java class +`cluster()`:: Returns the test cluster class, which is explained in the next paragraphs + + +[[test-cluster-methods]] +==== test cluster methods + +The `TestCluster` class is the heart of the cluster functionality in a randomized test and allows you to configure a specific setting or replay certain types of outages to check, how your custom code reacts. + +[horizontal] +`ensureAtLeastNumNodes(n)`:: Ensure at least the specified number of nodes is running in the cluster +`ensureAtMostNumNodes(n)`:: Ensure at most the specified number of nodes is running in the cluster +`getInstance()`:: Get a guice instantiated instance of a class from a random node +`getInstanceFromNode()`:: Get a guice instantiated instance of a class from a specified node +`stopRandomNode()`:: Stop a random node in your cluster to mimic an outage +`stopCurrentMasterNode()`:: Stop the current master node to force a new election +`stopRandomNonMaster()`:: Stop a random non master node to mimic an outage +`buildNode()`:: Create a new elasticsearch node +`startNode(settings)`:: Create and start a new elasticsearch node + + +[[accessing-clients]] +==== Accessing clients + +In order to execute any actions, you have to use a client. You can use the `ElasticsearchIntegrationTest.client()` method to get back a random client. This client can be a `TransportClient` or a `NodeClient` - and usually you do not need to care as long as the action gets executed. There are several more methods for client selection inside of the `TestCluster` class, which can be accessed using the `ElasticsearchIntegrationTest.cluster()` method. + +[horizontal] +`iterator()`:: An iterator over all available clients +`masterClient()`:: Returns a client which is connected to the master node +`nonMasterClient()`:: Returns a client which is not connected to the master node +`clientNodeClient()`:: Returns a client, which is running on a client node +`client(String nodeName)`:: Returns a client to a given node +`smartClient()`:: Returns a smart client + + +[[scoping]] +==== Scoping + +By default the tests are run without restarting the cluster between tests or test classes in order to be as fast as possible. Of course all indices and templates are deleted between each test. However, sometimes you need to start a new cluster for each test or for a whole test suite - for example, if you load a certain plugin, but you do not want to load it for every test. + +You can use the `@ClusterScope` annotation at class level to configure this behaviour + +[source,java] +----------------------------------------- +@ClusterScope(scope=SUITE, numNodes=1) +public class CustomSuggesterSearchTests extends ElasticsearchIntegrationTest { + // ... tests go here +} +----------------------------------------- + +The above sample configures an own cluster for this test suite, which is the class. Other values could be `GLOBAL` (the default) or `TEST` in order to spawn a new cluster for each test. The `numNodes` settings allows you to only start a certain number of nodes, which can speed up test execution, as starting a new node is a costly and time consuming operation and might not be needed for this test. + + +[[changing-node-configuration]] +==== Changing node configuration + +As elasticsearch is using JUnit 4, using the `@Before` and `@After` annotations is not a problem. However you should keep in mind, that this does not have any effect in your cluster setup, as the cluster is already up and running when those methods are run. So in case you want to configure settings - like loading a plugin on node startup - before the node is actually running, you should overwrite the `nodeSettings()` method from the `ElasticsearchIntegrationTest` class and change the cluster scope to `SUITE`. + +[source,java] +----------------------------------------- +@Override +protected Settings nodeSettings(int nodeOrdinal) { + return ImmutableSettings.settingsBuilder() + .put("plugin.types", CustomSuggesterPlugin.class.getName()) + .put(super.nodeSettings(nodeOrdinal)).build(); +} +----------------------------------------- + + + +[[randomized-testing]] +=== Randomized testing + +The code snippets you saw so far did not show any trace of randomized testing features, as they are carefully hidden under the hood. However when you are writing your own tests, you should make use of these features as well. Before starting with that, you should know, how to repeat a failed test with the same setup, how it failed. Luckily this is quite easy, as the whole mvn call is logged together with failed tests, which means you can simply copy and paste that line and run the test. + +[[generating-random-data]] +==== Generating random data + +The next step is to convert your test using static test data into a test using randomized test data. The kind of data you could randomize varies a lot with the functionality you are testing against. Take a look at the following examples (note, that this list could go on for pages, as a distributed system has many, many moving parts): + +* Searching for data using arbitrary UTF8 signs +* Changing your mapping configuration, index and field names with each run +* Changing your response sizes/configurable limits with each run +* Changing the number of shards/replicas when creating an index + +So, how can you create random data. The most important thing to know is, that you never should instantiate your own `Random` instance, but use the one provided in the `RandomizedTest`, from which all elasticsearch dependent test classes inherit from. + +[horizontal] +`getRandom()`:: Returns the random instance, which can recreated when calling the test with specific parameters +`randomBoolean()`:: Returns a random boolean +`randomByte()`:: Returns a random byte +`randomShort()`:: Returns a random short +`randomInt()`:: Returns a random integer +`randomLong()`:: Returns a random long +`randomFloat()`:: Returns a random float +`randomDouble()`:: Returns a random double + +`randomInt(max)`:: Returns a random integer between 0 and max +`between()`:: Returns a random between the supplied range +`atLeast()`:: Returns a random integer of at least the specified integer +`atMost()`:: Returns a random integer of at most the specified integer + +`randomLocale()`:: Returns a random locale +`randomTimeZone()`:: Returns a random timezone + +In addition, there are a couple of helper methods, allowing you to create random ASCII and Unicode strings, see methods beginning with `randomAscii`, `randomUnicode`, and `randomRealisticUnicode` in the random test class. The latter one tries to create more realistic unicode string by not being arbitrary random. + +If you want to debug a specific problem with a specific random seed, you can use the `@Seed` annotation to configure a specific seed for a test. If you want to run a test more than once, instead of starting the whole test suite over and over again, you can use the `@Repeat` annotation with an arbitrary value. Each iteration than gets run with a different seed. + + +[[assertions]] +=== Assertions + +As many elasticsearch tests are checking for a similar output, like the amount of hits or the first hit or special highlighting, a couple of predefined assertions have been created. Those have been put into the `ElasticsearchAssertions` class. + +[horizontal] +`assertHitCount()`:: Checks hit count of a search or count request +`assertAcked()`:: Ensure the a request has been ackknowledged by the master +`assertSearchHits()`:: Asserts a search response contains specific ids +`assertMatchCount()`:: Asserts a matching count from a percolation response +`assertFirstHit()`:: Asserts the first hit hits the specified matcher +`assertSecondHit()`:: Asserts the second hit hits the specified matcher +`assertThirdHit()`:: Asserts the third hits hits the specified matcher +`assertSearchHit()`:: Assert a certain element in a search response hits the specified matcher +`assertNoFailures()`:: Asserts that no shard failures have occured in the response +`assertHighlight()`:: Assert specific highlights matched +`assertSuggestion()`:: Assert for specific suggestions +`assertSuggestionSize()`:: Assert for specific suggestion count +`assertThrows()`:: Assert a specific exception has been thrown + +Common matchers + +[horizontal] +`hasId()`:: Matcher to check for a search hit id +`hasType()`:: Matcher to check for a search hit type +`hasIndex()`:: Matcher to check for a search hit index + +Usually, you would combine assertions and matchers in your test like this + +[source,java] +---------------------------- +SearchResponse seearchResponse = client().prepareSearch() ...; +assertHitCount(searchResponse, 4); +assertFirstHit(searchResponse, hasId("4")); +assertSearchHits(searchResponse, "1", "2", "3", "4"); +---------------------------- + + |
