Fix broken parent and child aggregator (backport #63811)#63892

Merged

nik9000 merged 1 commit intoelastic:7.10from nik9000:parent_child_aggs_busted_7_10

Oct 19, 2020

+147-66

Commits on Oct 19, 2020

Fix broken parent and child aggregator (elastic#63811 )
nik9000
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