But if I change it to (LastModifiedTime>) (IsDocument:True) (FileExtension=pdf) then I get ONLY PDFs Consider reaching out to Mighty Citizen to determine which targeted keywords should be used for search optimization. No matter what you're looking for, start with a simple search like where's the closest airport?. Control plane operations are accessed through aThis would return only for PDF files related to your search query. For example to specify that the search engine should only look in title