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

Opster Team

Aug-23, Version: 6.8-7.17

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Briefly, this error occurs when a user tries to perform a cluster health operation without assigning a task. This could be due to a misconfiguration or a bug in the Elasticsearch software. To resolve this issue, you can try the following: 1) Ensure that the cluster health operation is correctly configured and that a task is assigned. 2) Check for any known bugs in the Elasticsearch version you are using and upgrade if necessary. 3) If the problem persists, consider seeking help from the Elasticsearch community or support.

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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 Elasticsearch concepts: task, cluster, admin.

Log Context

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


    protected final void masterOperation(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 masterOperation(


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