Imported Upstream version 1.0.3upstream/1.0.3

1 files changed, 11 insertions, 0 deletions

diff --git a/docs/reference/mapping/fields/uid-field.asciidoc b/docs/reference/mapping/fields/uid-field.asciidoc
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+[[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.