This PR contains the deprecation notice that `create`, `create_doc`, `index` and
`write` ingest privileges do not permit mapping updates in version 8. It also
updates the docs description of said privileges.
This should've been part of #58784
Backport of #58898.
Part of #48366. Now that there is a dedicated API for dangling indices, the auto-import
behaviour can default to off. Also add a note to the breaking changes for 7.9.0.
Albert Zaharovits
Rory Hunter
Stuart Tettemer