[8.18] Add read-block to source index during data stream reindex (#122887) #123186
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…2887) When reindexing a data stream, we currently add a write block to the source indices so that new documents cannot be added to the index while it is being reindexed. A write block still allows the index to be deleted and for the metadata to be updated. It is possible that ILM could delete a backing index or update a backing index's lifecycle metadata while it is being reindexed. To avoid this, this PR sets a read-only block on the source index. This block must be removed before source index can be deleted after it is replaced with the destination index. (cherry picked from commit 2cc86b3) # Conflicts: # x-pack/plugin/migrate/src/internalClusterTest/java/org/elasticsearch/xpack/migrate/action/ReindexDatastreamIndexTransportActionIT.java # x-pack/plugin/migrate/src/main/java/org/elasticsearch/xpack/migrate/action/ReindexDataStreamIndexTransportAction.java
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