Fast, typo tolerant search engine for building delightful search experiences. Has an API and a number of protocol modules for different languages. Written in C and C++.

Designed for people who don't want to fuck with Elasticsearch, they just want a document search engine. Lightweight, powerful, scalable. Tries to have smart defaults. Single executable. Uses far less memory than the usual Java-based search systems do. Tries to be flexible so you can build the search engine you need.

Looks like you define a JSON document with the stuff you want to be able to search and throw it over to the engine. Means you'll need to write some front-end tooling to extract the data you want to index, which might not be that big a deal. It could just be some shell scripts.