[7.x] Add value_count mode to rate agg (#63687)#63847

Merged

imotov merged 1 commit intoelastic:7.xfrom imotov:issue-63575-value-count-rate-7.x

Oct 19, 2020

+293-29

Commits on Oct 16, 2020

Add value_count mode to rate agg (elastic#63687 )
imotov
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