Failed to clean up task – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when Elasticsearch is unable to remove a task from its task management system. This could be due to a variety of reasons such as insufficient permissions, a full disk, or a network issue. To resolve this issue, you can try the following: 1) Check and adjust the permissions of the Elasticsearch user, 2) Free up some disk space, 3) Check the network connectivity and settings, 4) Restart the Elasticsearch service, or 5) Upgrade Elasticsearch to the latest version as it might be a bug that has been fixed in newer versions.

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

Log Context

Log “failed to clean up task [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        logger.debug("task [{}] cleaned up"; persistentTask.getId());

                    public void onFailure(Exception e) {
                        logger.warn(new ParameterizedMessage("failed to clean up task [{}]"; persistentTask.getId()); e);


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