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db04288d14
When following the steps mentioned in upgrade guide https://www.elastic.co/guide/en/elastic-stack/6.6/upgrading-elastic-stack.html if we disable the cluster shard allocation but fail to enable it after upgrading the nodes and plugins, the next step of upgrading internal indices fails. As we did not check the bulk request response for reindexing, we delete the old index assuming it has been created. This is fatal as we cannot recover from this state. This commit adds a pre-upgrade check to test the cluster shard allocation setting and fail upgrade if it is disabled. In case there are search or bulk failures then we remove the read-only block and fail the upgrade index request. Closes #39339
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