elasticsearch/elasticsearch — pull request #7763 by kimchy (2014-09-17 08:55:00+00:00)
Title: Add missing cluster blocks handling for master operations

Master node related operations were missing proper handling of cluster blocks, allowing for example to perform cluster level update settings even before the state was fully restored on initial cluster startup

Note, the change allows to change read only related settings without checking for blocks on update settings, as without it, it means one can't re-enable metadata/write. Also, it doesn't check for blocks on cluster state and health API, as those are allowed to be used even when blocked to figure out what causes the block.