Qdrant 1.15.5 release notes, 30 Sep 2025

https://github.com/qdrant/qdrant/pull/7157 - Acknowledge update/delete by filter operations on flush, preventing very slow restart
https://github.com/qdrant/qdrant/pull/7217, https://github.com/qdrant/qdrant/pull/7218, https://github.com/qdrant/qdrant/pull/7219, https://github.com/qdrant/qdrant/pull/7220, https://github.com/qdrant/qdrant/pull/7221 - Add API validation to min_should, filters, point update batch and others
https://github.com/qdrant/qdrant/pull/7235 - Add timeout parameter to remove peer operation
https://github.com/qdrant/qdrant/pull/7320 - Decrease internal update batch sizes to minimize search latency spikes on large user batches
https://github.com/qdrant/qdrant/pull/7233 - Limit number of segments loaded in parallel, preventing potential OOM on large clusters
https://github.com/qdrant/qdrant/pull/7222 - Add strict mode configuration to specify max number of payload indices
https://github.com/qdrant/qdrant/pull/7240 - Improve error reporting on mutable ID tracker load errors
https://github.com/qdrant/qdrant/pull/7151 - Improve error reporting on flush problems
https://github.com/qdrant/qdrant/pull/7244 - Remove vector count field from collection info
https://github.com/qdrant/qdrant/pull/7177 - Do not anonymize peer ID in telemetry data

https://github.com/qdrant/qdrant/pull/7263 - Fix not flushing mutable ID tracker files after creation, potentially causing segment corruption
https://github.com/qdrant/qdrant/pull/7248 - Fix data race at the end of snapshot creation causing missing points
https://github.com/qdrant/qdrant/pull/7298, https://github.com/qdrant/qdrant/pull/7306 - Fix data race during snapshots corrupting point data if a point is moved
https://github.com/qdrant/qdrant/pull/7241, https://github.com/qdrant/qdrant/pull/7265, https://github.com/qdrant/qdrant/pull/7267, https://github.com/qdrant/qdrant/pull/7269, https://github.com/qdrant/qdrant/pull/7277 - Fix potential deadlock in REST runtime while streaming shard snapshot
https://github.com/qdrant/qdrant/pull/7015 - Fix potential deadlock on REST server runtime
https://github.com/qdrant/qdrant/pull/7172 - Fix potential recursive deadlock when fetching all vectors
https://github.com/qdrant/qdrant/pull/7203 - Fix potential deadlock in scroll API
https://github.com/qdrant/qdrant/pull/7303 - Fix incorrectly deleting old point versions from segments
https://github.com/qdrant/qdrant/pull/7194 - Fix upsert operations with duplicate point IDs not being applied properly
https://github.com/qdrant/qdrant/pull/7252 - Fix phrase matching ignoring unknown tokens
https://github.com/qdrant/qdrant/pull/7264 - Fix strict mode validation on nested filters