Exception in cluster coordination info request to master node – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.4

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Briefly, this error occurs when a node in the Elasticsearch cluster is unable to communicate with the master node. This could be due to network issues, the master node being down, or the cluster state being too large. To resolve this issue, you can check the network connectivity between the nodes, ensure the master node is up and running, or reduce the size of the cluster state by deleting unnecessary indices or reducing the number of shards.

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This guide will help you check for common problems that cause the log ” Exception in cluster coordination info request to master node ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: request, cluster, node, master.

Log Context

Log “Exception in cluster coordination info request to master node” classname is CoordinationDiagnosticsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        fetchClusterInfoListener.whenComplete(response -> {
            long endTime = System.nanoTime();
            logger.trace("Received cluster coordination info from {} in {}"; node; TimeValue.timeValueNanos(endTime - startTime));
            responseConsumer.accept(new ClusterFormationStateOrException(response.getClusterFormationState()));
        }; e -> {
            logger.warn("Exception in cluster coordination info request to master node"; e);
            responseConsumer.accept(new ClusterFormationStateOrException(e));

        return transportService.getThreadPool().schedule(() -> {
            Version minSupportedVersion = Version.V_8_4_0;


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