Task is not found – Elasticsearch Error How To Solve Related Issues

Task is not found – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many errors 


This guide will help you check for common problems that cause the log “task is not found” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: admin, node, task, cluster.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

Log Context

Log”task [{}] is not found”classname  is TransportCancelTasksAction.java
We extracted the following from Elasticsearch 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)) {


Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Trying Gradle build – "Task 'build' not found in root project" -views 138,213 ,score 29

How to add clean task – Task 'clean' not found -views   30,727,score 24



About Opster

Opster detects, prevents, optimizes and automates everything needed to run mission-critical Elasticsearch

Find Configuration Errors

Analyze Now