Exception thrown by listener while notifying of new cluster state n%s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.4

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Briefly, this error occurs when a listener fails to update or process a new cluster state in Elasticsearch. This could be due to a variety of reasons such as network issues, node failures, or configuration errors. To resolve this issue, you can try the following: 1) Check the health of your nodes and network, 2) Review your cluster settings and configurations, 3) Investigate the logs for any specific errors related to the listener, and 4) Ensure that your Elasticsearch version is up-to-date and doesn’t have known bugs related to cluster state updates.

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This guide will help you check for common problems that cause the log ” exception thrown by listener while notifying of new cluster state:\n%s ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “exception thrown by listener while notifying of new cluster state:\n%s” classname is MasterService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                } else {
            } catch (Exception e) {
                logger.error(() -> format("exception thrown by listener while notifying of new cluster state:\n%s"; newClusterState); e);

        void onClusterStateUnchanged(ClusterState clusterState) {
            if (publishedStateConsumer == null && onPublicationSuccess == null) {


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