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_uid
edit_uid
editEach 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.