No type s loaded – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to find or load a specific type of plugin or module, indicated by the variable “type”. This could be due to incorrect configuration, missing files, or compatibility issues. To resolve this, ensure that the required plugins or modules are properly installed and configured. Check the OpenSearch logs for more detailed error messages. If the issue persists, try reinstalling the plugin or module, or consider upgrading OpenSearch to a version that is compatible with the plugin or module.

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This guide will help you check for common problems that cause the log ” no ” + type + “s loaded ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: plugins.

Log Context

Log “no ” + type + “s loaded” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


    private static void logPluginInfo(final List pluginInfos; final String type; final Logger logger) {
        assert pluginInfos != null;
        if (pluginInfos.isEmpty()) {
  "no " + type + "s loaded");
        } else {
            for (final String name : {
      "loaded " + type + " [" + name + "]");


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