Term version reason – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch cannot process a request due to a mismatch or conflict with the term, version, or reason specified in the request. This could be due to incorrect syntax, outdated version, or an invalid term. To resolve this issue, you can: 1) Check and correct the syntax of your request; 2) Ensure you’re using a compatible version of OpenSearch; 3) Verify the term used in your request is valid and acceptable.

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This guide will help you check for common problems that cause the log ” {}; term: {}; version: {}; reason: {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “{}; term: {}; version: {}; reason: {}” classname is ClusterApplierService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        // new cluster state; notify all listeners
        final DiscoveryNodes.Delta nodesDelta = clusterChangedEvent.nodesDelta();
        if (nodesDelta.hasChanges() && logger.isInfoEnabled()) {
            String summary = nodesDelta.shortSummary();
            if (summary.length() > 0) {
                logger.info("{}; term: {}; version: {}; reason: {}";
                    summary; newClusterState.term(); newClusterState.version(); task.source);

        logger.trace("connecting to nodes of cluster state with version {}"; newClusterState.version());


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