Task is not found – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is trying to access a task that doesn’t exist or has been deleted. This could be due to a timing issue, where the task was deleted before it could be accessed, or a misconfiguration in the task settings. To resolve this issue, you can try the following: 1) Check the task ID for any errors and correct them if necessary. 2) Ensure that the task is not being deleted before it’s accessed. 3) Review the task configuration settings to ensure they’re correct. 4) If the error persists, consider recreating the task.

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This guide will help you check for common problems that cause the log ” task [{}] is not found ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: node, cluster, task, admin.

Log Context

Log “task [{}] is not found” class name is TransportCancelTasksAction.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 } else {
 if (taskManager.getTask(request.getTaskId().getId()) != null) {
 // The task exists; but doesn't support cancellation
 throw new IllegalArgumentException("task [" + request.getTaskId() + "] doesn't support cancellation");
 } else {
 throw new ResourceNotFoundException("task [{}] is not found"; request.getTaskId());
 } else {
 for (CancellableTask task : taskManager.getCancellableTasks().values()) {
 if (request.match(task)) {


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