Do you know of any client-side search solutions for static sites?

I'm looking for a way to add search to a fully static site (think technical documentation) without any server side compute or API.

My idea was to implement one that generates a static index that can be queried by client-side javascript when doing a search, and have the index be organized in such a way that it can be used without having to download the entire thing.

I feel like this should exist already, but I have zero experience here. So, can anyone share suggestions?