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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.
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