https://news.ycombinator.com/item?id=39119198
https://news.ycombinator.com/item?id=38971221
https://github.blog/2023-02-06-the-technology-behind-githubs-new-code-search/
https://github.blog/2021-12-15-a-brief-history-of-code-search-at-github/
Meilisearch 1.0 – Open-source search engine built in Rust
https://news.ycombinator.com/item?id=34707727
Mantiscore is an opensource fork of Sphinx Search (C++)
https://news.ycombinator.com/item?id=34741018
ZincSearch alternative to elasticsearch that requires minimal resources, written in Go. https://github.com/zinclabs/zinc
TypeSence - About Open Source alternative to Algolia and an Easier-to-Use alternative to ElasticSearch https://github.com/typesense/typesense