No longer master while failing shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8

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Briefly, this error occurs when a node that was previously the master is no longer the master, and it tries to fail a shard. This could be due to network issues, heavy load, or a configuration problem causing a new master to be elected. To resolve this, you can check the cluster health and logs to identify any network or load issues. If it’s a configuration issue, ensure that the discovery.zen.minimum_master_nodes setting is correctly configured. Also, consider increasing the timeout settings if the cluster is under heavy load.

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

Log Context

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


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


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