Failed to clean async result taskId getEncoded – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch fails to clean up the results of an asynchronous task due to an internal issue, such as a problem with the task management system or a network glitch. To resolve this issue, you can try restarting the Elasticsearch node, checking the network connection, or increasing the timeout settings. If the problem persists, you may need to investigate the task management system for any potential bugs or issues.

This guide will help you check for common problems that cause the log ” failed to clean async result [” + taskId.getEncoded() + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, task.

Log Context

Log “failed to clean async result [” + taskId.getEncoded() + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            // the index may not be there (no initial async search response stored yet?): we still want to return 200
            // note that index missing comes back as 200 hence it's handled in the onResponse callback
            if (status == RestStatus.NOT_FOUND && taskWasFound) {
            } else {
                logger.error(() -> "failed to clean async result [" + taskId.getEncoded() + "]"; exc);
                listener.onFailure(new ResourceNotFoundException(taskId.getEncoded()));


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