[8.x] [Index Management + ML] Remove unused code from index management and ml (#211266)#212591

Samiul-TheSoccerFan merged 2 commits intoelastic:8.xelastic/kibana:8.xfrom

Samiul-TheSoccerFan:backport/8.x/pr-211266Samiul-TheSoccerFan/kibana:backport/8.x/pr-211266Copy head branch name to clipboard