Failed to notify ClusterStateListener – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while notifying a ClusterStateListener about changes in the cluster state. This could be due to a network issue, a node failure, or a problem with the listener itself. To resolve this issue, you can try restarting the Elasticsearch node, checking the network connectivity between nodes, or debugging the listener to identify any issues. If the problem persists, consider checking the Elasticsearch logs for more detailed error messages that can help pinpoint the exact cause of the issue.

This guide will help you check for common problems that cause the log ” failed to notify ClusterStateListener ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “failed to notify ClusterStateListener” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                final String name = listener.toString();
                try (Releasable ignored = stopWatch.record(name)) {
            } catch (Exception ex) {
                logger.warn("failed to notify ClusterStateListener"; ex);
            // TODO assert "ClusterStateApplier must not set response headers in the ClusterStateListener"


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