Attempt to execute a cluster health operation without a task – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when a user tries to perform a cluster health operation without assigning a specific task. This could be due to a misconfiguration or a missing parameter in the request. To resolve this issue, ensure that the correct task is specified when executing the cluster health operation. Also, check the OpenSearch configuration to ensure that all necessary parameters are correctly set. If the error persists, it may be necessary to debug the OpenSearch code to identify the root cause.

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This guide will help you check for common problems that cause the log ” attempt to execute a cluster health operation without a task ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster, task, admin.

Log Context

Log “attempt to execute a cluster health operation without a task” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    protected final void clusterManagerOperation(
        ClusterHealthRequest request;
        ClusterState state;
        ActionListener listener
    ) throws Exception {
        logger.warn("attempt to execute a cluster health operation without a task");
        throw new UnsupportedOperationException("task parameter is required for this operation");

    protected void clusterManagerOperation(


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