Unexpected failure during cluster state update – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.9-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while updating the cluster state. This could be due to a variety of reasons such as network issues, node failures, or insufficient resources. To resolve this issue, you can try the following: 1) Check the health of your nodes and ensure they are all functioning correctly. 2) Verify your network connectivity. 3) Ensure your cluster has sufficient resources (CPU, memory, disk space). 4) Check your Elasticsearch logs for more detailed error messages that can help pinpoint the problem.

This guide will help you check for common problems that cause the log ” Unexpected failure during cluster state update ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “Unexpected failure during cluster state update” classname is SnapshotsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                assert snapshotDeletionListeners.isEmpty() : "No new listeners should have been added but saw " + snapshotDeletionListeners;
            } else {
                assert false
                    : new AssertionError("Modifying snapshot state should only ever fail because we failed to publish new state"; e);
                logger.error("Unexpected failure during cluster state update"; e);


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