Overview

Design Elasticsearch 9 vector search and RAG systems that stay fast, accurate, and predictable in production. Elasticsearch 9 changes how vector search, quantization, and hybrid retrieval behave under real load, yet many teams still ship clusters that fall over when traffic or data grows. Guesswork around HNSW settings, BBQ, DiskBBQ, and filtered ANN often leads to fragile systems and painful outages. This book walks you through the full lifecycle of Elasticsearch 9 search workloads, from upgrade planning and data modeling to dense vectors, BBQ and DiskBBQ, ESQL workflows, and production playbooks, so you can reason about behavior instead of tuning by accident. Understand Elasticsearch 9 search architecture, shards, segments, and upgrade paths for vector heavy clusters Model documents and chunks for hybrid retrieval and RAG with clean metadata for filters multi tenant access and citations Choose and tune dense_vector mappings similarity functions and HNSW parameters for balanced recall and latency Apply Better Binary Quantization and DiskBBQ to cut memory and storage while keeping quality with oversampling and rescoring Design filtered vector search that actually works using ACORN concepts and patterns for ACL and time sliced data Build maintainable hybrid search that combines lexical search vectors RRF fusion and rerankers without unreadable queries Use retrievers as the primary query interface and wire them into ESQL FORK and FUSE pipelines Map and query semantic_text fields and roll out semantic retrieval safely across models and indices Integrate inference endpoints for embeddings and reranking with clear security observability and fallback paths Adopt ESQL LOOKUP JOIN for in cluster enrichment and cleaner joins between chunk and source indices Run relevance experiments, Rally style benchmarks, and capacity planning focused on recall latency and cost per query Follow concrete production playbooks and reference implementations for hybrid retrieval, RAG services, and ESQL based search stacks You also get practical add ons, including deployment checklists, reference pipelines using retrievers, rerankers, and ESQL LOOKUP JOIN, plus a benchmark harness with Rally style tests and a capacity sizing worksheet that you can adapt to your own environment. Throughout the chapters you work through realistic JSON mappings, curl examples, Docker and configuration snippets, and ESQL queries that you can lift into your own clusters with minimal adjustment. Grab your copy today and build Elasticsearch 9 search systems you can trust in production.

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