Cherry-pick #21444 to 7.x: Add implementation of FSWatcher and FSScanner for filestream#21468

Merged

kvch merged 2 commits intoelastic:7.xfrom kvch:backport_21444_7.x

Oct 5, 2020

+787

Commits on Oct 2, 2020

Add implementation of FSWatcher and FSScanner for filestream (elastic#21444 )
kvch
committed

Commits on Oct 5, 2020

Do not run symlink tests on Windows (elastic#21472 )
kvch
committed