Cherry-pick #17759 to 7.x: Add fields validation for histogram subfields#17785

Merged

jsoriano merged 1 commit intoelastic:7.xfrom jsoriano:backport_17759_7.x

Apr 21, 2020

+13-7

Commits on Apr 17, 2020

Add fields validation for histogram subfields (elastic#17759 )
jsoriano
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