Initialized extension – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.9

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Briefly, this error occurs when an extension is successfully initialized in OpenSearch. It’s not an error message but an informational log indicating that a particular extension has been loaded correctly. If you’re seeing this message frequently and it’s cluttering your logs, you might want to adjust your logging level to WARN or ERROR. Alternatively, if the extension is not needed, you can disable it in your OpenSearch configuration.

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

Log Context

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

            public void handleResponse(InitializeExtensionResponse response) {
                for (DiscoveryExtensionNode extension : extensionIdMap.values()) {
                    if (extension.getName().equals(response.getName())) {
                        initializedExtensions.put(extension.getId(); extension);
              "Initialized extension: " + extension.getName());


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