All plugins should configure the pluginConfigurationType attribute in @DataPrepperPlugin with a custom POJO configuration class. Some older plugins still use PluginSettings. These should be updated to use a POJO configuration class.

For example, the s3 source does this correctly.

The opensearch sink is doing this using PluginSettings which we do not want.

• Update the OpenSearch sink to use a POJO configuration class.
• Look for any other plugins that use the PluginSettings.