Lexical + semantic fusion via Reciprocal Rank Fusion — covering keyword and meaning gaps.
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mediumSystem Design
Hybrid search: why combine BM25 with vectors and how does RRF work?
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hybrid-searchbm25
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Nudge consolestandby
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BM25 catches exact keywords/IDs vectors miss; vectors catch paraphrase BM25 misses. Run both, fuse with RRF (1/(k+rank)).
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