I have a document library in SharePoint 2013 on premise. I have added a 'Document Type' site column of Choice type in the document library. Now I will add 'Document Type' as refiners in the search page.
My document library will have many records(more than 20k). So if I add 'Document Type' as index column in my document library then will it help as refiner in a search page or not.
Should I add 'Document Type' as index column to improve the performance as refiner or it will not help as refiner?