Cherry-pick to 7.x: Report if index is hidden in index stats (#18706)#19746

Merged

ycombinator merged 1 commit intoelastic:7.xfrom ycombinator:backport/7.x/pr-18706

Jul 9, 2020

+70-1

Commits on Jul 8, 2020

Report if index is hidden in index stats (#18706 )
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