May 20, 2026 · DB

Replacing Elasticsearch with PostgreSQL for Korean Search — An 8-Phase Study

textsearch_ko (MeCab) + pg_textsearch BM25 + pgvector HNSW + DB-side RRF matches Elasticsearch on Korean search quality and runs 2–5× faster on a single node. Eight phases of measurement, head-to-head against ES, Qdrant, and Vespa.