Exception thrown by listener while notifying no longer master – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.1-8.2

Briefly, this error occurs when a node in an Elasticsearch cluster believes it is no longer the master node. This can happen due to network issues, heavy load, or configuration problems causing the node to lose its master status. To resolve this, you can try the following: 1) Check and improve your network connectivity, 2) Balance the load across the cluster nodes, 3) Review and correct your cluster’s configuration settings, and 4) Increase the ‘discovery.zen.ping_timeout’ value to allow more time for the master to respond.

This guide will help you check for common problems that cause the log ” exception thrown by listener while notifying no longer master ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, master.

Log Context

Log “exception thrown by listener while notifying no longer master” classname is MasterService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            public void onNoLongerMaster() {
                try (ThreadContext.StoredContext ignore = threadContextSupplier.get()) {
                } catch (Exception e) {
                    logger.error("exception thrown by listener while notifying no longer master"; e);

            public ContextPreservingAckListener wrapInTaskContext(@Nullable ClusterStateAckListener clusterStateAckListener) {


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