11 lines
388 B
Plaintext
11 lines
388 B
Plaintext
[[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 for type based filtering, as well as for
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lookups of `_id` and `_type`.
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