[7.8] [DOCS] Adds documentation for drilldowns (#68122)#68661

Merged

gchaps merged 1 commit intoelastic:7.8from gchaps:backport/7.8/pr-68122

Jun 9, 2020

+110

Commits on Jun 9, 2020

[DOCS] Adds documentation for drilldowns (elastic#68122 )

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