No longer cluster-manager while failing shard – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2-2.9

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Briefly, this error occurs when a node that was previously acting as the cluster manager loses its status while trying to fail a shard. This could be due to network issues, resource constraints, or a configuration problem. To resolve this, you can try the following: 1) Check the cluster health and network connectivity between nodes. 2) Ensure that the node has sufficient resources (CPU, memory, disk space). 3) Review the cluster settings and node configurations to ensure they are correct. 4) If the problem persists, consider restarting the node or the entire cluster.

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This guide will help you check for common problems that cause the log ” {} no longer cluster-manager while failing shard [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster, shard.

Log Context

Log “{} no longer cluster-manager while failing shard [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


                    public void onNoLongerClusterManager(String source) {
                        logger.error("{} no longer cluster-manager while failing shard [{}]"; request.shardId; request);
                        try {
                            channel.sendResponse(new NotClusterManagerException(source));
                        } catch (Exception channelException) {
                                () -> new ParameterizedMessage(


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