Task is missing – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to find a specific task that it’s supposed to execute. This could be due to the task being deleted, or it might not have been created properly. To resolve this issue, you can try the following: 1) Check if the task was correctly created and is still present in the system. 2) If the task was deleted, recreate it. 3) If the task is not executing as expected, check the task’s configuration and make sure it’s set up correctly.

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

Log Context

Log “task [{}] is missing” class name is TransportTasksAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 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 {
 final var tasks = new ArrayList();
 for (Task task : taskManager.getTasks().values()) {
 if (request.match(task)) {


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