Task doesn t support this operation – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when you try to perform an operation on a task in Elasticsearch that is not supported by that specific task. This could be due to a variety of reasons such as trying to cancel a task that cannot be cancelled or trying to retrieve information that the task does not provide. To resolve this issue, you should first identify the task and the operation you are trying to perform. Then, check the Elasticsearch documentation to ensure that the operation is supported for that task. If it is not, you will need to find an alternative way to achieve your goal.

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This guide will help you check for common problems that cause the log ” task [{}] doesn’t support this operation ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: task.

Log Context

Log “task [{}] doesn’t support this operation” class name is TransportTasksAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Task task = taskManager.getTask(request.getTargetTaskId().getId());
 if (task != null) {
 if (request.match(task)) {
 return List.of((OperationTask) task);
 } else {
 throw new ResourceNotFoundException("task [{}] doesn't support this operation"; request.getTargetTaskId());
 } else {
 throw new ResourceNotFoundException("task [{}] is missing"; request.getTargetTaskId());
 } else {


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