Apply cluster states in system context#53819

DaveCTurner wants to merge 2 commits intoelastic:7.xelastic/elasticsearch:7.xfrom

DaveCTurner:2020-03-19-system-context-in-applier-7xDaveCTurner/elasticsearch:2020-03-19-system-context-in-applier-7xCopy head branch name to clipboard