[DOCS] Adds documentation for drilldowns#68122

Merged

gchaps merged 5 commits intoelastic:masterfrom gchaps:docs/drilldowns

Jun 9, 2020

+110

Commits on Jun 3, 2020

[DOCS] Adds documentation for drilldowns
gchaps
committed

Commits on Jun 5, 2020

Commits on Jun 8, 2020

[DOCS] Adds image of drilldowns and other tweaks to text
gchaps
committed