Failed to send error message back to client for action – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

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Briefly, this error occurs when Elasticsearch encounters an issue while trying to send an error message back to the client. This could be due to network issues, client disconnection, or internal server problems. To resolve this, you can check the network connection between the client and the server, ensure the client is properly connected and receiving responses, and inspect the server logs for any internal issues. If the problem persists, consider restarting the Elasticsearch server or the client application.

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This guide will help you check for common problems that cause the log ” Failed to send error message back to client for action [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: client.

Log Context

Log “Failed to send error message back to client for action [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    private static void sendErrorResponse(String actionName; TransportChannel transportChannel; Exception e) {
        try {
        } catch (Exception inner) {
            logger.warn(() -> new ParameterizedMessage("Failed to send error message back to client for action [{}]"; actionName); inner);

    private  void handleResponse(
        InetSocketAddress remoteAddress;


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