Xiaolin Talks Programming

Aug 14, 2026 · Backend Development

Spring Boot + OpenSearch: Building Hybrid Search with Full-Text, Vector Recall & RRF Ranking

This guide walks through building a production-ready hybrid search system using Spring Boot and OpenSearch, covering mapping design for BM25 and k-NN vector search, synonym configuration, RRF-based score fusion, connection pool tuning, multi-tenant security with DLS/FLS, CDC data sync, and cluster operations including ISM lifecycle policies.