Fixup rare terms (backport of #64366) #64416
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In elastic#64016 I caused a bug in rare_terms where we would rewrite the current leaf and remove all hits from it, causing us to trip an assertion. This didn't happen before because previously we never rewrote the current leaf. The fix involves cleaning up the state that the deferring collector uses if we end up removing all hits. This requires some super intimate knowledge of how `BestBucketsDeferringCollector` works so I decided to move the implementation of that mergin from `MergingBucketsDeferringCollector` into `BestBucketsDeferringCollector`. This means that `MergingBucketsDeferringCollector` is pretty much empty now. So I've deprecated it and will remove it entirely in an subsequent change. Closes elastic#64356
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In #64016 I caused a bug in rare_terms where we would rewrite the
current leaf and remove all hits from it, causing us to trip an
assertion. This didn't happen before because previously we never rewrote
the current leaf. The fix involves cleaning up the state that the
deferring collector uses if we end up removing all hits.
This requires some super intimate knowledge of how
BestBucketsDeferringCollectorworks so I decided to move theimplementation of that mergin from
MergingBucketsDeferringCollectorinto
BestBucketsDeferringCollector. This means thatMergingBucketsDeferringCollectoris pretty much empty now. So I'vedeprecated it and will remove it entirely in an subsequent change.
Closes #64356