No extension found for remote reindex listener – 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 the required extension for the remote reindex listener. This could be due to a missing or incorrectly configured plugin. To resolve this issue, ensure that the necessary plugin is installed and properly configured. If the plugin is already installed, try updating or reinstalling it. Additionally, check your OpenSearch configuration settings to ensure they are correct. If the problem persists, consider seeking help from the OpenSearch community or support team.

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This guide will help you check for common problems that cause the log ” No extension found for remote reindex listener ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, reindex.

Log Context

Log “No extension found for remote reindex listener” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            return listener;
        if (remoteExtension.isPresent()) {
            return remoteExtension.get().getRemoteReindexActionListener(listener; reindexRequest);
        }"No extension found for remote reindex listener");
        return listener;

    static RestClient buildRestClient(RemoteInfo remoteInfo; ReindexSslConfig sslConfig; long taskId; List threadCollector) {
        return buildRestClient(remoteInfo; sslConfig; taskId; threadCollector; Optional.empty());


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