v2.5.18

## v2.5.18

Release date: September 19, 2025

| Milvus version | Python SDK version | Node.js SDK version | Java SDK version |
|----------------|--------------------|---------------------|------------------|
| 2.5.18          | 2.5.16            | 2.5.12              | 2.5.13           |

We were excited to announce Milvus 2.5.18! This release delivered critical performance enhancements and stability improvements. We strongly encouraged all users to upgrade to benefit from these optimizations.

### Improvements

- Removed timeout for compaction task ([#44278](https://github.com/milvus-io/milvus/pull/44278))
- Forbade panic when tantivy index path did not exist ([#44136](https://github.com/milvus-io/milvus/pull/44136))
- Updated knowhere version ([#44292](https://github.com/milvus-io/milvus/pull/44292))
- Added param to modify delete snapshot size ([#44213](https://github.com/milvus-io/milvus/pull/44213))
- Added mutex and range check to prevent concurrent delete ([#44202](https://github.com/milvus-io/milvus/pull/44202))
- Removed name check for alter index task ([#44056](https://github.com/milvus-io/milvus/pull/44056))
- Returned collection metadata from cache ([#43911](https://github.com/milvus-io/milvus/pull/43911))
- Supported expr result cache ([#43882](https://github.com/milvus-io/milvus/pull/43882))
- Made build ratio of interim index configurable ([#43938](https://github.com/milvus-io/milvus/pull/43938))
- Used function def determine field IsFunctionOutput only ([#44009](https://github.com/milvus-io/milvus/pull/44009))
- Used rlock for list privilege groups ([#44006](https://github.com/milvus-io/milvus/pull/44006))
- Added param item forcing all indices ready for segment ([#44329](https://github.com/milvus-io/milvus/pull/44329))

### Bug fixes

- Fixed a bug that caused incorrect metrics for compaction tasks ([#44280](https://github.com/milvus-io/milvus/pull/44280))
- Resolved an issue with invalid pre-allocated segment IDs during compaction ([#44351](https://github.com/milvus-io/milvus/pull/44351))
- Corrected a bug where GetCompactionTo incorrectly returned empty results during clustering compaction ([#44271](https://github.com/milvus-io/milvus/pull/44271))
- Added a nil check for arraydata to prevent a system panic ([#44333](https://github.com/milvus-io/milvus/pull/44333))
- Implemented a UTF-8 check in BM25FunctionRunner to handle non-UTF-8 strings ([#44221](https://github.com/milvus-io/milvus/pull/44221))
- Expanded the lock range for dump\_snapshot to prevent coredumps during delete operations ([#44131](https://github.com/milvus-io/milvus/pull/44131))
- Invalidated the proxy cache for alias creation to ensure updates were immediately reflected ([#44073](https://github.com/milvus-io/milvus/pull/44073))