Stop terms agg from losing buckets (backport of #70493) #70670
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When the `terms` agg is at the top level it can run as a `filters` agg instead because that is typically faster. This was added in elastic#68871 and we mistakely made it so that a bucket without any hits could take up a slot on the way back to the coordinating node. You could trigger this by having a fairly precise `size` on the terms agg and a top level filter. This fixes the issue by properly mimicing the regular terms aggregator in the "as filters" version: only send back buckets without any matching documents if the min_doc_count is 0. Closes elastic#70449
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When the
termsagg is at the top level it can run as afiltersagginstead because that is typically faster. This was added in #68871 and
we mistakely made it so that a bucket without any hits could take up a
slot on the way back to the coordinating node. You could trigger this by
having a fairly precise
sizeon the terms agg and a top level filter.This fixes the issue by properly mimicing the regular terms aggregator
in the "as filters" version: only send back buckets without any matching
documents if the min_doc_count is 0.
Closes #70449