[7.x] Disallow duplicate percentiles (#57444) (#58299)#59360

Merged

ThomThomson merged 1 commit intoelastic:7.xfrom ThomThomson:backport/7.x/pr-58299

Mar 5, 2020

+199-73

Commits on Mar 4, 2020

Disallow duplicate percentiles (elastic#57444 ) (elastic#58299 )
ThomThomson
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