Simon Willnauer 1cae850cf5 Add a cluster block that allows to delete indices that are read-only (#24678)
Today when an index is `read-only` the index is also blocked from
being deleted which sometimes is undesired since in-order to make
changes to a cluster indices must be deleted to free up space. This is
a likely scenario in a hosted environment when disk-space is limited to switch
indices read-only but allow deletions to free up space.
2017-05-16 17:34:37 +02:00
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