v2.5.15

## v2.5.15

Release date: July 23, 2025

| Milvus version | Python SDK version | Node.js SDK version | Java SDK version |
|----------------|--------------------|---------------------|------------------|
| 2.5.15          | 2.5.14            | 2.5.12              | 2.5.11           |

We're excited to announce Milvus 2.5.15! This version enhances your experience by fixing a series of functionality bugs, including ones that may severely damage the metadata causing data loss when collection is renamed. It also delivers a range of general performance and stability enhancements, while resolving numerous bugs to ensure a more robust system. **We encourage you to upgrade to 2.5.15, especially if you are currently on 2.5.14, and explore these latest updates!**

### Improvements

- Updated Knowhere version to fix a sparse vector brute force bug ([#43398](https://github.com/milvus-io/milvus/pull/43398)).
- Implemented meta saving with txn limits ([#43287](https://github.com/milvus-io/milvus/pull/43287)).
- Applied load config changes after QueryCoord restart ([#43236](https://github.com/milvus-io/milvus/pull/43236)).
- Refined variable-length-type memory usage ([#43093](https://github.com/milvus-io/milvus/pull/43093)).
- Reordered RootCoord shutdown to be last in coordinator stop sequence ([#43024](https://github.com/milvus-io/milvus/pull/43024)).
- Updated CMake version to 3.31.8 ([#43004](https://github.com/milvus-io/milvus/pull/43004)).

### Bug fixes

- Skipped remove operation if key exists in save set ([#43426](https://github.com/milvus-io/milvus/pull/43426)).
- Fixed null bitmap offset alignment when loading multi-chunk data ([#43411](https://github.com/milvus-io/milvus/pull/43411), [#43342](https://github.com/milvus-io/milvus/pull/43342)).
- Updated Tantivy to fix directory removing race condition ([#43401](https://github.com/milvus-io/milvus/pull/43401)).
- Fixed an issue by calling `AlterCollection` only when renaming collections ([#43421](https://github.com/milvus-io/milvus/pull/43421)).
- Made `MultiSaveAndRemove` execute removal operations first ([#43409](https://github.com/milvus-io/milvus/pull/43409)).
- Used disk segment max size for collections with both sparse and dense vectors ([#43195](https://github.com/milvus-io/milvus/pull/43195)).
- Fixed text match bug by adapting to multi-chunk model ([#43297](https://github.com/milvus-io/milvus/pull/43297)).
- Fixed incorrect bitset for division comparison when the right operand is negative ([#43180](https://github.com/milvus-io/milvus/pull/43180)).
- Voided unnecessary copying when getting JSON chunks ([#43183](https://github.com/milvus-io/milvus/pull/43183), [#43202](https://github.com/milvus-io/milvus/pull/43202)).
- Prevented delegator from becoming unserviceable due to shard leader changes ([#43309](https://github.com/milvus-io/milvus/pull/43309)).
- Fixed text match index and JSON key stats index leaks when segments are released ([#43308](https://github.com/milvus-io/milvus/pull/43308)).
- Fixed `RegeneratePartitionStats` failure after restoring clustering compaction tasks ([#43206](https://github.com/milvus-io/milvus/pull/43206)).
- Added error handling for invalid function parameters to prevent panics ([#43190](https://github.com/milvus-io/milvus/pull/43190)).
- Removed space trimming logic when validating collection names ([#43138](https://github.com/milvus-io/milvus/pull/43138)).
- Added field mmap property checks before applying collection-level settings ([#43091](https://github.com/milvus-io/milvus/pull/43091)).
- Fixed index creation being blocked by failed sort stats ([#43061](https://github.com/milvus-io/milvus/pull/43061)).
- Fixed exclude nodes clearing logic in load balancer retry mechanism ([#43002](https://github.com/milvus-io/milvus/pull/43002)).