[7.x] [TSVB] Fix percentiles band mode (#60741)#60924

Merged

sulemanof merged 1 commit intoelastic:7.xfrom sulemanof:backport/7.x/pr-60741

Mar 24, 2020

+61-57

Commits on Mar 23, 2020

[TSVB] Fix percentiles band mode (elastic#60741 )
sulemanof
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