Qdrant 1.13.1 release notes, 23 Jan 2025

https://github.com/qdrant/qdrant/pull/5820 - Improve performance and memory usage of segment merging in optimizers

https://github.com/qdrant/qdrant/pull/5848 - Fix potential panic in search after GPU HNSW building
https://github.com/qdrant/qdrant/pull/5847 - Fix potential panic in GPU HNSW building when having empty payload index
https://github.com/qdrant/qdrant/pull/5819 - Fix set payload by key on in-memory payload storage not persisting properly
https://github.com/qdrant/qdrant/pull/5861 - Fix memory mapped sparse vector storage not flushing mappings properly
https://github.com/qdrant/qdrant/pull/5838 - Fix user-defined sharding not persisting numeric shard keys properly
https://github.com/qdrant/qdrant/pull/5842 - Do not flush empty memory maps to prevent panic on macOS
https://github.com/qdrant/qdrant/pull/5843 - Do not flush explicitly when unloading blob storage
https://github.com/qdrant/qdrant/pull/5845 - Fix potential panic in full text index due to missed bound check