More than one implementation found – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch discovers multiple implementations for a specific feature or plugin. This can happen if there are duplicate plugins installed or if there’s a conflict between different versions of the same plugin. To resolve this issue, you can 1) Check your plugins directory and remove any duplicates or outdated versions. 2) If you’re using custom plugins, ensure they’re correctly implemented and not conflicting with existing ones. 3) Restart OpenSearch after making changes to ensure they take effect.

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

Log Context

Log “More than one implementation found:” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        if (remoteReindexExtensionList.isEmpty()) {
  "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.
            TransportReindexAction.remoteExtension = Optional.ofNullable(remoteReindexExtensionList.get(0));
  "Loaded extension " + TransportReindexAction.remoteExtension);


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