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+[[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.