How is the massive documentation for Unreal not searchable?!!

Hi, I’m trying my best to search through the documentation for specific subjects and I can’t find a way to properly search and show sections of where to find these subjects…ya know, like a glossary?! Am I just missing something or did Epic really not create this basic function that even the most basic of sites can do. It’s hard to believe that they could develop such an amazing engine with some of the most brilliant engineers and even have a massive learning capability but failed to provide an easy navigation of said resources. Please help, or is there a downloadable pdf I can search with?