Qdrant 1.15 - Smarter Quantization & better Text Filtering - Qdrant

Introduced 1.5-bit and 2-bit quantization for improved accuracy and compression, and asymmetric quantization for smarter memory use by allowing different encoding for stored vectors and queries. Enhanced the text index with multilingual tokenization, stop words, stemming, and phrase matching capabilities. Added Maximal Marginal Relevance (MMR) reranking to balance relevance and diversity in search results. Implemented HNSW healing for index reuse and migration to Gridstore for faster ingestion.