Question on bento box search tools

Hello All, I am looking to implement a bento box search tool similar to what is on https://libraries.indiana.edu/ or https://www.lib.umich.edu/ when you search something.

Does anyone know where I can find a good site to learn this or how to implement it.
The UI/UX elements of a bento box are relatively simple and straight forward. Pulling the search results (intelligently sorted by relevancy) is very difficult and non-trivial.

I am trying to find what current bento box search tools exist….

Question on bento box search tools