Have tried to search in the JPG files for the search terms in the so-called IPTC data. With the trick you described on Feb 21, 2018 from the integration EXIV2 in the program FLPro I also succeeded.
However, if you have many photos, several gigabytes, the search takes infinitely long. At the point indexing IPTC and possibly Exif data would have been a super solution.
Is it in the new version of FLPro 9 this function sometime to expect.
Thanks in advance