Return 429 status code on read_only_allow_delete index block (#50166) #52672
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We consider index level read_only_allow_delete blocks temporary since
the DiskThresholdMonitor can automatically release those when an index
is no longer allocated on nodes above high threshold.
The rest status has therefore been changed to 429 when encountering this
index block to signal retryability to clients.
Related to #49393
This is a backport PR - only to get full CI. If successful I intend to just close it and push original change.