The scenario (2016 on prem): I have a set of lists which all contains some items. I have set up a search query which limits results to items from selected lists within the same site.
I would like to present some refiners for the user to easily filter the search results. For instance I have a list called companies and another called plants. Can anyone please explain (farily detailed) how I would set up custom refiners in order for the user to be able to click "companies" and only see results from the company list?