Unexpected failure during current state version – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch encounters an unexpected issue during a specific operation, which could be due to various reasons such as network issues, node failures, or data inconsistencies. The state version mentioned refers to the current version of the cluster state. To resolve this, you could try restarting the OpenSearch service, checking the network connectivity between nodes, or verifying the integrity of your data. If the issue persists, consider checking the OpenSearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” unexpected failure during [{}]; current state version [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: version, routing, cluster.

Log Context

Log “unexpected failure during [{}]; current state version [{}]” classname is BatchedRerouteService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                        final ClusterState state = clusterService.state();
                        if (logger.isTraceEnabled()) {
                            logger.error(() -> new ParameterizedMessage("unexpected failure during [{}]; current state:\n{}";
                                source; state); e);
                        } else {
                            logger.error(() -> new ParameterizedMessage("unexpected failure during [{}]; current state version [{}]";
                                source; state.version()); e);
                            new OpenSearchException("delayed reroute [" + reason + "] failed"; e));


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