Did not find expected entry in the cluster state – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch cannot locate a specific entry in the cluster state. This could be due to a synchronization issue, a node failure, or a problem with the cluster state. To resolve this issue, you can try restarting the OpenSearch service, ensuring all nodes are properly connected and synchronized, or restoring the cluster state from a backup. If the problem persists, you may need to rebuild the cluster or consult with an OpenSearch expert for further troubleshooting.

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This guide will help you check for common problems that cause the log ” Did not find expected entry [{}] in the cluster state ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “Did not find expected entry [{}] in the cluster state” classname is SnapshotsService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                        runReadyClone(target; sourceSnapshot; shardStatusBefore; repoShardId; repository; remoteStoreIndexShallowCopy);
                } else {
                    // Extremely unlikely corner case of cluster-manager failing over between between starting the clone and
                    // starting shard clones.
                    logger.warn("Did not find expected entry [{}] in the cluster state"; cloneEntry);
        }; "start snapshot clone"; onFailure); onFailure);


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