[7.x] Do not remove flood block from indices on nodes undergoing replacement (#78942) #79008
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elastic#78942) This commit enhances `DiskThresholdMonitor` so that indices that have a flood-stage block will not have the block removed while they reside on a node that is part of a "REPLACE"-type node shutdown. This prevents a situation where a node is blocked due to disk usage, then during the replacement the block is removed while shards are relocating to the target node, indexing occurs, and then the target runs out of space due to the additional documents. Relates to elastic#70338 and elastic#76247 # Conflicts: # server/src/test/java/org/elasticsearch/cluster/routing/allocation/DiskThresholdMonitorTests.java
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Backports the following commits to 7.x: