Full Page Cache matches the content of the disquallifiers with the whole page content and if it finds the string in the whole page content then it will exclude that page from the cache. To make a catalogue search result page out of cache, first add any unique string on that page, and make sure it is unique otherwise it will exclude all the pages which has that string present.

You can go to the corresponding html and put <!--------pagename------>  (replace page with unique string ) and then put this same string in the disquallifiers. That should do it!