SharePoint Online Search Caching Controls
SharePoint Online Search cache displays "You've seen this result before" or "You've seen these results before". The information often represents content that has been removed or permissions changed -causing users to receive an error. Removing the URL from the tenant search settings doesn't help. There are other times when caching causes an issue with search results as well. However, at the very least, we need the ability to easily remove the "you've seen this result before" section out of the search results page without having to completely reset the search index for the entire tenant.