What kinda thing do you want to search? Text I guess? But there are search engines for images, gifs, video, all kinds of stuff.
I'm working at an open-source project that builds an AI-powered search framework [0], and I've built some examples in very few lines of code (for searching fashion products via image or text [1], PDF text/images/tables search [2]) and one of our community members built a protein search engine [3].
A good place to start might be with a no-code solution like (shameless self-plug time) Jina NOW [4], which lets you build a search engine and GUI with just one CLI command.
[0] https://github.com/jina-ai/jina/
[1] https://examples.jina.ai/fashion/
[2] https://colab.research.google.com/github/jina-ai/workshops/b...