The purpose of this plugin is to edit the content of the document at .synonyms/_doc/synonyms. For more information on this document and how it is used please visit : https://github.com/Telicent-io/telicent-opensearch
To install the plugin you need to install the packaged version in /build to your opensearch dashboard instance like that
opensearch-dashboards-plugin install "file://path/synonymEditingPlugin-3.2.0.zip"
Then the developed plugin can be found at bottom of the context menu, under the name "synonymEditingPlugin". From there, you'll be presented with 2 screens allowing you to edit explicit and equivalent synonyms lists.