Fail force-merges on read-only engines (#64756)#66490

Merged

DaveCTurner merged 3 commits intoelastic:7.xfrom DaveCTurner:2020-12-17-backport-64756

Dec 17, 2020

+88

Commits on Dec 17, 2020

Fail force-merges on read-only engines (elastic#64756 )

howardhuanghua
authored and
DaveCTurner
committed
Fix comments in docs
DaveCTurner
committed
Say it's a bug
DaveCTurner
committed