In on-premises SharePoint 2016, I was having trouble getting results based on a content type that I had created when trying to configure a result source to search for that type of content . I finally decided to see what I had done on a working SharePoint 2013 site, when I realized that using the result source query generator in 2016 , when I choose "ContentType" and click "Add a property filter", the query generator actually inserted "ContentTypeId", not "ContentType". It baffled me a little. I just wanted to post this, in case someone has a similar problem. Once I manually edited the inserted text to simply delete the "Id" at the end of "ContentType", the source of the results worked as I expected. Is this a bug in SharePoint 2016 or is it expected to be in one way or another? If so, where do you report bugs in SharePoint to Microsoft?