Hybrid Search and Reranking for Production RAG: An ADR
Hybrid BM25 plus dense retrieval with reranking: architecture, fusion methods, latency and cost, and when to skip reranking. A 2026 decision record.
Hybrid Search Architecture: Dense + Sparse Fusion with RRF (2026)
Hybrid search architecture explained: fusing BM25 sparse retrieval with dense vector search using Reciprocal Rank Fusion - indexing, scoring, rerankers, latency and failure modes for production RAG in 2026.