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There isn't alot of documentation around Related Searches web part. This web part seems be related to populate suggestions dictionary. It can be populated initially from a static list of values. Then click-through will continue to add values to this list (when the same value has been entered 6 or more times).
Use this link to see how this can be tested.
https://www.sharemuch.com/2011/02/23/adding-related-searches-in-sharepoint-2010-search/