Qdrant 1.19 Fixes Multi-Tenant BM25 Scoring Interference

qdrant_engine · x · 2026-08-10

Qdrant version 1.19 resolves an issue with BM25 scoring in multi-tenant collections. Previously, IDF (Inverse Document Frequency) was calculated globally across all tenants. If tenants used vastly different vocabularies, their statistics were mixed, degrading search accuracy.

The new version allows calculating IDF statistics per tenant. Each tenant's BM25 score is now based solely on their own data, ensuring more accurate lexical search without the need for separate collections.

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