Task cancelled – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.12-8.9

Briefly, this error occurs when an Elasticsearch task is cancelled before it can be completed. This could be due to a timeout, a manual cancellation, or a system shutdown. To resolve this issue, you can increase the timeout limit, ensure that tasks are not manually cancelled prematurely, or check for any system instability that could be causing unexpected shutdowns. Additionally, you can monitor your Elasticsearch cluster to identify any long-running tasks that may be causing issues.

This guide will help you check for common problems that cause the log ” task cancelled [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: task.

Log Context

Log “task cancelled [” class name is CancellableTask.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 private TaskCancelledException getTaskCancelledException() {
 assert Thread.holdsLock(this);
 assert isCancelled;
 assert reason != null;
 return new TaskCancelledException("task cancelled [" + reason + ']');
 }  /**
 * This interface is implemented by any class that needs to react to the cancellation of this task.


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