Can t send mapping refresh for no cluster-manager known – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2-2.9

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Briefly, this error occurs when OpenSearch is unable to refresh the mapping because it can’t identify the cluster manager. This could be due to network issues, incorrect configuration, or the cluster manager being down. To resolve this, ensure that the cluster manager is running and reachable. Check your network settings and OpenSearch configuration for any errors. If the issue persists, consider restarting the OpenSearch service or the entire cluster to reset the connections.

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This guide will help you check for common problems that cause the log ” can’t send mapping refresh for [{}]; no cluster-manager known. ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: refresh, cluster, index, mapping.

Log Context

Log “can’t send mapping refresh for [{}]; no cluster-manager known.” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


    public void nodeMappingRefresh(final DiscoveryNode clusterManagerNode; final NodeMappingRefreshRequest request) {
        if (clusterManagerNode == null) {
            logger.warn("can't send mapping refresh for [{}]; no cluster-manager known."; request.index());
        transportService.sendRequest(clusterManagerNode; ACTION_NAME; request; EmptyTransportResponseHandler.INSTANCE_SAME);


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