BM25

Probabilistic ranking function for information retrieval scoring document relevance to a query.

Database Integration

pg_textsearch: Open-source PostgreSQL extension implementing state-of-the-art BM25, eliminating need for external search engines (e.g., Elasticsearch) in many use cases.
Particularly effective for RAG (Retrieval Augmented Generation) applications by enabling database-native text search with relevance scoring.
Reduces infrastructure complexity while maintaining search relevance for AI-driven workflows.