Return distinct items from GetMany and SourceMany (#4353) #4400
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This commit fixes a bug where a GetMany or SourceMany API call
with a repeated id would return a cartesian product of id and documents.
enumerate only distinct ids when retrieving hits
or source from GetMany and SourceMany, so that the same id input
to either will return only a single document per target index.
fix a bug in the MultiGetRequestFormatter whereby
the document index is removed when a request index is specified,
without checking whether the document index matches the request index.
Fixes #4342
(cherry-picked from commit 8cbc1fe)