Vector isn't enough: Elastic workshop on hybrid search and retrieval for agents
AI Engineer · youtube · 2026-10-11
Elastic's Jeff Vestal and James Williams work backward from agent behavior to the retrieval layer. Hands-on labs compare semantic search with BM25, showing why similar meaning misses exact identifiers and vice versa. Covers reciprocal rank fusion, linear combination with tunable weights, filtering, judgment sets, search templates for query routing, and reranking tradeoffs. Through line: improve and measure the evidence reaching an agent before expecting the model to rescue poor retrieval.
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