Fix broken parent and child aggregator (backport #63811) #63892
Merged
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In #57892 I broke some sub-aggregations inside of the
parent
andchild
aggregator, specifically any sub-aggregations that do work inthe
postCollect
phase. This fixes it by delaying the post collectphase of aggs under
parent
andchild
untilbeforeBuildingBuckets
because, well, we haven't done any collection until after that phase.