Hybrid Search

What is Hybrid Search?

Hybrid search merges lexical (BM25/phrases) and vector signals in recall or ranking. It protects exact brands/SKUs while rescuing paraphrased queries.

How It Works (quick)

• Dual recall: Run BM25 and vector recall in parallel.
• Merge: De-duplicate and union candidates.
• Re-rank: Score with features (lexical, vector, business) via LTR/neural.
• Guardrails: Hard filters and diversity caps.

Why It Matters in E-commerce

• Best of both: Exact matches + semantic coverage.
• Reduces zero-results without noisy expansions.

Best Practices

• Keep exact fields (brand/SKU) prioritized.
• Calibrate per category/locale.
• Cap vector influence; log contributions.

Summary

Hybrid search is the pragmatic default: lexical precision plus semantic reach, under clear caps.