Sending extension request type – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.9

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Briefly, this error occurs when OpenSearch is trying to send an extension request but encounters an issue. This could be due to network problems, incorrect configuration, or the extension not being properly installed or supported. To resolve this, you can check your network connection, verify the configuration settings, or ensure the extension is correctly installed and compatible with your OpenSearch version. If the problem persists, consider disabling the extension temporarily to see if it’s the cause of the issue.

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This guide will help you check for common problems that cause the log ” Sending extension request type: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: request.

Log Context

Log “Sending extension request type:” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            public String executor() {
                return ThreadPool.Names.GENERIC;
        };"Sending extension request type: " + REQUEST_EXTENSION_ACTION_NAME);
        transportService.getThreadPool().generic().execute(new AbstractRunnable() {
            public void onFailure(Exception e) {
                if (e.getCause() instanceof ConnectTransportException) {


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