Node stats response received is null empty – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.4-2.9

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Briefly, this error occurs when the OpenSearch cluster fails to retrieve node statistics due to issues like network problems, node unavailability, or insufficient permissions. To resolve this, ensure that all nodes are up and running properly, check network connectivity between nodes, and verify that the user has the necessary permissions to access node stats. Additionally, check for any issues with the OpenSearch service itself, and consider restarting it if necessary.

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This guide will help you check for common problems that cause the log ” Node stats response received is null/empty. ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: response, cluster, node.

Log Context

Log “Node stats response received is null/empty.” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


    private void logActiveConnections(NodesStatsResponse nodesStatsResponse) {
        if (nodesStatsResponse == null || nodesStatsResponse.getNodes() == null) {
  "Node stats response received is null/empty.");

        Map nodeActiveConnectionMap = new HashMap();
        List responseNodes = nodesStatsResponse.getNodes();


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