Attempt to execute a master node operation without task – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

Briefly, this error occurs when a task is attempted to be executed on the master node without a task. This usually happens when there is a misconfiguration or a bug in the code. To resolve this issue, you can try the following: 1) Check your code for any bugs or errors that might be causing this issue. 2) Ensure that your Elasticsearch cluster is properly configured and that all nodes are correctly connected. 3) Update your Elasticsearch version to the latest one, as this might be a bug that has been fixed in a newer version.

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

Log Context

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

    protected abstract ClusterBlockException checkBlock(Request request; ClusterState state);

    protected final void doExecute(final Request request; ActionListener listener) {
        logger.warn("attempt to execute a master node operation without task");
        throw new UnsupportedOperationException("task parameter is required for this operation");

    protected void doExecute(Task task; final Request request; ActionListener listener) {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?