PluginService onIndexModule index – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.9

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Briefly, this error occurs when there’s an issue with a plugin interacting with an index module in OpenSearch. It could be due to an incompatible plugin version, incorrect plugin configuration, or a faulty plugin. To resolve this, you can try updating the plugin to its latest version, reconfiguring the plugin settings, or disabling and re-enabling the plugin. If the error persists, consider removing the plugin and reinstalling it. If the issue is still not resolved, it might be necessary to check the plugin’s code for any potential bugs.

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This guide will help you check for common problems that cause the log ” PluginService:onIndexModule index: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: plugins, index, plugin.

Log Context

Log “PluginService:onIndexModule index:” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        return services;

    public void onIndexModule(IndexModule indexModule) {"PluginService:onIndexModule index:" + indexModule.getIndex());
        for (Tuple plugin : plugins) {


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