[7.x][docs] Backport: Clarify privileges required for the writer role (#15604)#15665

Merged

dedemorton merged 1 commit intoelastic:7.xfrom dedemorton:backport_15604_7.x

Jan 21, 2020

+3-2

Commits on Jan 18, 2020

[docs] Clarify privileges required for the writer role (elastic#15604 )
dedemorton
committed