Failed to handle exception for action handler – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch encounters an issue while processing a request due to a problem with the action handler. This could be due to a variety of reasons such as incorrect configuration, insufficient resources, or a bug in the code. To resolve this issue, you can try the following: 1) Check and correct the configuration settings, 2) Ensure that the system has enough resources (CPU, memory, disk space), 3) Update Elasticsearch to the latest version to fix any potential bugs, and 4) Review the code for any errors or inconsistencies.

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

Log Context

Log “failed to handle exception for action [{}]; handler [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        protected void processException(final TransportResponseHandler handler; final RemoteTransportException rtx) {
            try {
            } catch (Throwable e) {
                logger.error("failed to handle exception for action [{}]; handler [{}]"; e; action; handler);

        public long getRequestId() {


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