OpenSearch/docs/reference/mapping/fields/uid-field.asciidoc

[[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 for type based filtering, as well as for
lookups of `_id` and `_type`.
Migrated documentation into the main repo 2013-08-28 19:24:34 -04:00			`[[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).`

Docs: Cleanup meta field docs Meta fields were locked down to not allow exotic options to the underlying field types in #8143. This change fixes the docs to no longer refer to the old settings. closes #10879 2015-04-30 18:01:35 -04:00			The `_uid` field is for type based filtering, as well as for
			lookups of `_id` and `_type`.