Duplicate uniqueId extension getUniqueId Did not load extension – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.8

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Briefly, this error occurs when two or more extensions in OpenSearch have the same unique ID. This is problematic because each extension should have a unique identifier for proper functioning. To resolve this issue, you can follow these steps: 1) Identify the extensions with the duplicate IDs. 2) Change the unique ID of one of the extensions to a different value. 3) Reload the extensions. This should resolve the conflict and allow the extensions to load correctly.

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This guide will help you check for common problems that cause the log ” Duplicate uniqueId ” + extension.getUniqueId() + “. Did not load extension: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “Duplicate uniqueId ” + extension.getUniqueId() + “. Did not load extension: ” classname is ExtensionsManager.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

     * Loads a single extension
     * @param extension The extension to be loaded
    private void loadExtension(Extension extension) throws IOException {
        if (extensionIdMap.containsKey(extension.getUniqueId())) {
            logger.info("Duplicate uniqueId " + extension.getUniqueId() + ". Did not load extension: " + extension);
        } else {
            try {
                DiscoveryExtensionNode discoveryExtensionNode = new DiscoveryExtensionNode(


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