Task cancelled with reason %s – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.4-8.9

Briefly, this error occurs when an Elasticsearch task is cancelled due to a specific reason, denoted by [%s]. This could be due to a variety of reasons such as a timeout, a node failure, or a manual cancellation. To resolve this issue, you can increase the timeout limit, ensure the health of your nodes, or check for any manual interruptions. Additionally, you can also check the Elasticsearch logs for more details about the cancellation reason.

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

Log Context

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

 ) {
 CategoryDefinition categoryDefinition = CategoryDefinition.LENIENT_PARSER.apply(parser; null);
 // Check if parent task is cancelled as augmentation of many categories is a non-trivial task
 if (parentTask != null && parentTask.isCancelled()) {
 new TaskCancelledException(format("task cancelled with reason [%s]"; parentTask.getReasonCancelled()))
 if (augment) {


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