Yeah, and I think it actually uses a pretty old (0.x) version of lunr. You could definitely grab data over the network and then feed it into lunr's indexer, you'd just have to do it manually. I'd prefer to do it more like Cloudflare's stackexchange search (build the index locally, and publish the index to IPFS), rather than having the client have to fetch the data and build the index itself.

Your tool looks cool! If I find the time, maybe I'll try to dig in a bit and see if I can help with anything!