Loaded extension – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when an extension that has been loaded into OpenSearch is causing issues. This could be due to compatibility problems, incorrect configuration, or the extension itself might be faulty. To resolve this issue, you can try the following: 1) Check if the extension is compatible with your current version of OpenSearch. 2) Review the configuration settings of the extension to ensure they are correct. 3) Try disabling the extension to see if the error persists. If it doesn’t, the extension might be the problem and you may need to find an alternative or update it.

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

Log Context

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

            if (remoteReindexExtensionList.size() > 1) {
                logger.warn("More than one implementation found: " + remoteReindexExtensionList);
            // We shouldn't have more than one extension. Incase there is; we simply pick the first one.
            TransportReindexAction.remoteExtension = Optional.ofNullable(remoteReindexExtensionList.get(0));
            logger.info("Loaded extension " + TransportReindexAction.remoteExtension);


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