You should add this option to filter shorts: https://www.youtube.com/results?search_query=%s&sp=CAI%253D

Also, related project: https://filmot.com/search/radiohead%20/1/1?sortField=uploadd...

It allows you to do text to full search on youtube videos. The project obviously didn't index ALL youtube videos subtitles, but it easily index millions of youtube subtitles.