Unable to find any implementation for RemoteReindexExtension – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch cannot find any implementation for the RemoteReindexExtension. This usually happens when there’s a misconfiguration or missing dependencies in your OpenSearch setup. To resolve this issue, you can try the following steps: 1) Ensure that all necessary plugins are installed and correctly configured. 2) Check your OpenSearch configuration files for any errors or missing entries related to RemoteReindexExtension. 3) Update or reinstall OpenSearch to ensure you have the latest version with all necessary components.

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

Log Context

Log “Unable to find any implementation for RemoteReindexExtension” classname is ReindexPlugin.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        logger.info("ReindexPlugin reloadSPI called");
        Iterable iterable = loader.loadExtensions(RemoteReindexExtension.class);
        List remoteReindexExtensionList = new ArrayList();
        if (remoteReindexExtensionList.isEmpty()) {
            logger.info("Unable to find any implementation for RemoteReindexExtension");
        } else {
            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.


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