Failed to handle exception response – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Failed to handle exception response ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: response.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

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

         final RemoteTransportException rtx = (RemoteTransportException) error;
        threadPool.executor(handler.executor()).execute(() -> {
            try {
            } catch (Exception e) {
                logger.error(() -> new ParameterizedMessage("failed to handle exception response [{}]"; handler); e);

    protected void handleRequest(TcpChannel channel; InboundMessage.RequestMessage message; int messageLengthBytes) throws IOException {


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