12 lines
443 B
Plaintext
12 lines
443 B
Plaintext
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[[mapping-uid-field]]
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=== `_uid`
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Each document indexed is associated with an id and a type, the internal
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`_uid` field is the unique identifier of a document within an index and
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is composed of the type and the id (meaning that different types can
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have the same id and still maintain uniqueness).
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The `_uid` field is automatically used when `_type` is not indexed to
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perform type based filtering, and does not require the `_id` to be
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indexed.
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