Could not load extension with uniqueId extension getUniqueId due to – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.6-2.8

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Briefly, this error occurs when OpenSearch fails to load a specific extension due to issues like incorrect configuration, missing files, or compatibility problems. To resolve this, ensure the extension is correctly installed and configured. Check if the extension files are present and not corrupted. Also, verify if the extension is compatible with your current version of OpenSearch. If the problem persists, consider reinstalling the extension or updating OpenSearch to a version that supports the extension.

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

Log Context

Log “Could not load extension with uniqueId ” + extension.getUniqueId() + ” due to ” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                extensionIdMap.put(extension.getUniqueId(); discoveryExtensionNode);
                extensionSettingsMap.put(extension.getUniqueId(); extension);
      "Loaded extension with uniqueId " + extension.getUniqueId() + ": " + extension);
            } catch (OpenSearchException e) {
                logger.error("Could not load extension with uniqueId " + extension.getUniqueId() + " due to " + e);
            } catch (IllegalArgumentException e) {
                throw e;


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