feat(qdrant): expose RRF k and weights parameters in QdrantHybridRetriever

[SyedShahmeerAli12]

Related Issues

• closes Qdrant: Add RRF parameters to hybrid search #3701

Proposed Changes

Exposes the k and weights RRF parameters introduced in Qdrant v1.16/v1.17 in QdrantHybridRetriever and the underlying _query_hybrid / _query_hybrid_async methods of QdrantDocumentStore.

• Added rrf_k: int | None and rrf_weights: list[float] | None to QdrantHybridRetriever.__init__, run, and run_async
• Added same params to QdrantDocumentStore._query_hybrid and _query_hybrid_async
• Added _build_rrf_query() helper that returns rest.RrfQuery when either param is set, falling back to rest.FusionQuery(fusion=rest.Fusion.RRF) for backward compatibility
• Runtime params in run / run_async override init-time defaults
• Bumped qdrant-client minimum from >=1.12.0 to >=1.14.2 (when RrfQuery was introduced)

Testing

• All 259 tests pass (118 unit + 141 integration), all run locally against :memory: mode no Docker required
• Added test_to_dict_with_rrf_params, test_run_passes_rrf_params, test_run_runtime_rrf_params_override_init

[github-actions]

Hi @SyedShahmeerAli12, thanks for your interest in contributing to Haystack! 🙏

⚠️ You currently have 4 open pull requests in this repository (#3565, #3483, #3254 and this one). Our review capacity is limited, so please hold off opening more PRs until we've had a chance to review your first 2 open PRs. This helps us give each contribution the attention it deserves. Thank you!

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[github-actions]

Coverage report (qdrant)

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
integrations/qdrant/src/haystack_integrations/components/retrievers/qdrant
retriever.py
integrations/qdrant/src/haystack_integrations/document_stores/qdrant
document_store.py					1690-1694, 1717, 1952-1954, 1977-1978
Project Total

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