* [DOCS] Fix styling of deprecation message
Fixes the alignment and display of the deprecation messages on the index-level data tier allocation filtering page.
* Add quotes to deprecation string
* Deprecate single-tier allocation filtering settings
`(index|cluster).routing.allocation.(include|exclude|require)._tier` settings are now deprecated in
favor of using `index.routing.allocation.include._tier_preference`.
* Update deprecation message
This adds general overview documentation for data tiers,
the data tiers specific node roles, and their application in
ILM.
Co-authored-by: Lee Hinman <dakrone@users.noreply.github.com>
Co-authored-by: debadair <debadair@elastic.co>
(cherry picked from commit d588cab747)
Signed-off-by: Andrei Dan <andrei.dan@elastic.co>
Co-authored-by: Lee Hinman <dakrone@users.noreply.github.com>
Co-authored-by: debadair <debadair@elastic.co>
