docs: add hybrid search (FT.HYBRID) section to the user guide#40
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Document hybrid_vector_search() in the vector-search how-to (RRF and LINEAR fusion, knobs, and vector-leg tuning), and relabel the existing filter-then-KNN section as "pre-filter hybrid search" to distinguish it from true fusion. Update the README capability list to list both. Jira: RAAE-1322
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Summary
Follow-up to the FT.HYBRID feature (#37, shipped in v0.7.0): adds user-facing docs for
hybrid_vector_search().docs/user_guide/how_to_guides/vector-search.md: new Hybrid fusion (FT.HYBRID) section coveringhybrid_vector_search(cosine_distance(...), fulltext(...), rrf()|linear()), the RRF/LINEAR fusion methods and their knobs (constant/window,alpha), text scorer, and vector-leg tuning (ef_runtime,vector_range). Requires Redis 8.4+ and redis-py >= 7.1.0.hybrid_vector_search(...)toFT.HYBRID)" separately.Docs only, no code changes.
Jira: RAAE-1322