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

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to process a specific action due to an exception. This could be due to a variety of reasons such as incorrect query syntax, insufficient resources, or a bug in the Elasticsearch code. To resolve this issue, you can try the following: 1) Check the syntax of your query for any errors. 2) Ensure that Elasticsearch has enough resources (CPU, memory, disk space). 3) Update Elasticsearch to the latest version to fix any potential bugs. 4) Check the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” failed to handle exception for action [%s]; handler [%s] ” 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 [%s]; handler [%s]” 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 (Exception e) {
                logger.error(() -> format("failed to handle exception for action [%s]; handler [%s]"; action; handler); e);

        public String getChannelType() {


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