milvus-sdk-cpp-2.6.2

Release date: 2026-04-14

Compatible with Milvus v2.6.x

Improvement

• Use conan to manage dependencies
• Set grpc keepalive interval to 10s with 5s timeout
• Support TruncateCollection() interface
• Add AISAQ and RTREE index type

Bug

• Set limit to -1 for QueryIterator/SearchIterator so that they can iterate entire collection by default
• Fix a bug in ListIndexes() when listing indexes in an empty collection
• Fix a bug in DropIndex()

milvus-sdk-cpp-2.6.1

Release date: 2026-01-20

Compatible with Milvus v2.6.x

Feature

• Add CreateSimpleCollectionRequest for quickly creating a simple collection
• Add Get() interface
• Compatible with zilliz cloud instance, supports connecting with uri
• Support Multi-language Analyzers
• Support partial update

Improvement

• Pass collection_name/description to CreateCollectionRequest instead of CollectionSchema
• Pass num_shards to CreateCollectionRequest instead of CollectionSchema
• DescribeIndex/DropIndex supports both field_name and index_name
• Add multi-vector methods for SearchRequest/SubSearchRequest
• Refine the request classes to reduce duplicate source code
• SearchResult can return recalls if enable_recall_calculation is true for zilliz cloud instance
• Add a method AddTypeParam() for the FieldSchema class

Bug

• AlterIndexProperties/DropIndexProperties cannot handle field_name, use index_name as input
• Fix a bug that CreateIndexRequest sync mode is not correctly work to wait index
• Fix a bug that SearchRequest.AddSparseVector() miss sparse vector when the size is unequal to the first vector
• Fix a bug that search response might treat collection name as primary key name

milvus-sdk-cpp-2.5.4

Release date: 2026-01-20

Compatible with Milvus v2.5.x

Feature

• Add CreateSimpleCollectionRequest for quickly creating a simple collection
• Add Get() interface
• Compatible with zilliz cloud instance, supports connecting with URI

Improvement

• Pass collection_name/description to CreateCollectionRequest instead of CollectionSchema
• Pass num_shards to CreateCollectionRequest instead of CollectionSchema
• DescribeIndex/DropIndex support both field_name and index_name
• Add multi-vector methods for SearchRequest/SubSearchRequest
• Refine the request classes to reduce duplicate source code
• SearchResult can return recalls if enable_recall_calculation is true for zilliz cloud instance

Bug

• AlterIndexProperties/DropIndexProperties cannot handle field_name, use index_name as input
• Fix a bug that CreateIndexRequest sync mode is not correctly work to wait index
• Fix a bug in SearchRequest.AddSparseVector() miss sparse vector when the size is unequal to the first vector
• Fix a bug that search response might treat collection name as primary key name

milvus-sdk-cpp-2.6.0

Release date: 2025-12-22

Compatible with Milvus v2.6.x

Feature

• Support Int8Vector field
• Support Struct field
• Support Geometry field
• Support Timestamptz field
• Support index types: HNSW_SQ/HNSW_PQ/HNSW_PRQ/IVF_RABITQ/MINHASH_LSH/NGRAM
• Support metric types: MHJACCARD/MAX_SIM_COSINE/MAX_SIM_IP/MAX_SIM_L2/MAX_SIM_JACCARD/MAX_SIM_HAMMING
• Support AddCollectionField()
• Support CreateCollection with indexes
• Support Rerank for SearchRequest

Improvement

• Replace AddXXXVector(fieldName, vector) of SearchRequest/SubSearchRequest with WithFieldName() + AddXXXVector(vector)
• LoadCollection/LoadPartitions with timeout setting, for waiting loading progress
• CreateIndex with timeout setting, for waiting index progress
• Flush with timeout setting, for waiting flush action complete
• DescribeCollection outputs properties
• GetLoadState returns loading progress percent
• Change default value of enable_dynamic_schema from false to true

Bug

• Fix a bug that DescribeIndex() always returns all indexes no matter field_name is specified or not

milvus-sdk-cpp-2.5.3

Release date: 2025-12-22

Compatible with Milvus v2.5.x

Feature

• Support CreateCollection with indexes

Improvement

• Replace AddXXXVector(fieldName, vector) of SearchRequest/SubSearchRequest with WithFieldName() + AddXXXVector(vector)
• LoadCollection/LoadPartitions with timeout setting, for waiting loading progress
• CreateIndex with timeout setting, for waiting index progress
• Flush with timeout setting, for waiting flush action complete
• DescribeCollection outputs properties
• GetLoadState returns loading progress percent
• Change default value of enable_dynamic_schema from false to true

Bug

• Fix a bug that DescribeIndex() always returns all indexes no matter field_name is specified or not

milvus-sdk-cpp-2.5.2

Release date: 2025-12-04

Compatible with Milvus v2.5.x

Feature

• Introduce MilvusClientV2 for clean/expandable interfaces

milvus-sdk-cpp-2.5.1

Release date: 2025-11-21

Compatible with Milvus v2.5.x

Feature

• Support RunAnalyzer()

milvus-sdk-cpp-2.5.0

Release date: 2025-11-11

Compatible with Milvus v2.5.x

Feature

• Support nullable field
• Support default value for field
• Support clustering key
• Support BM25 full text search
• Support text match
• Support BITMAP/HNSW_SQ/HNSW_PQ/HNSW_PRQ index types

Improvement

• Support group_size and strict_group_size for Search() and HybridSearch()

milvus-sdk-cpp-2.4.1

Release date: 2025-11-11

Compatible with Milvus v2.4.x

Feature

• Support partition key

Bug

• Fix a bug that dynamic fields are missed for row-based insert/upsert
• Fix a bug that all dynamic fields are displayed for search/query even if the output_fields only contain some of them
• Fix a bug of dynamic field that describeCollection missed enable_dynamic
• Fix a bug for insert that incorrect range check of float values

Improvement

• Allow to insert dynamic fields for column-based insert/upsert
• Change default value of shards_num to 1

milvus-sdk-cpp-2.4.0

Release date: 2025-09-19

Compatible with Milvus v2.4.x

Feature

• Add new index types(DISKANN/AUTOINDEX/SCANN/GPU_IVF_FLAT/GPU_IVF_PQ/GPU_BRUTE_FORCE/GPU_CAGRA/TRIE/STL_SORT/INVERTED/SPARSE_INVERTED_INDEX/SPARSE_WAND)
• Add new metric types(COSINE)
• Support CreateDatabase/DropDatabase/ListDatabases/AlterDatabase/DescribeDatabase/UsingDatabase interfaces
• Support JSON field
• Support Array field
• Support dynamic field
• Support SparseVector field
• Support Float16Vector/BFloat16Vector field
• Support Upsert interface
• Support Consistency level
• Support query by count(*)
• Support GetLoadState interface
• Support HybridSearch interface
• Support row-based insert/upsert
• Support DescribeAlias/ListAliases interfaces
• Support AlterCollection/AlterCollectionField interfaces
• Support AlterIndexProperties/DropIndexProperties interfaces
• Support CreateResourceGroup/DropResourceGroup/UpdateResourceGroups/ListResourceGroups/DescribeResourceGroup interfaces
• Support TransferNode/TransferReplica interfaces
• Support CreateUser/UpdatePassword/DropUser/DescribeUser/ListUsers interfaces
• Support CreateRole/DropRole/DescribeRole/ListRoles/GrantRole/RevokeRole interfaces
• Support GrantPrivilege/RevokePrivilege/CreatePrivilegeGroup/DropPrivilegeGroup/ListPrivilegeGroups/AddPrivilegesToGroup/RemovePrivilegesFromGroup interfaces
• Support QueryIterator/SearchIterator
• Support CreateImportJobs/ListImportJobs/GetImportJobProgress interfaces

Improvement

• Support connection with dbname
• DropIndex() interface accepts index_name instead of field_name
• Cache collection schema to reduce DescribeCollection call
• Support search with grouping by field
• Add retry machinery for rpc call
• Add CurrentUsedDatabase method for MilvusClient
• Add methods for QuertResults/SearchResults to return row-based results

Other changes

• Remove unsupported index types(IVF_HNSW/RHNSW_FLAT/RHNSW_SQ/RHNSW_PQ/ANNOY)
• Remove unsupported metric types(TANIMOTO/SUBSTRUCTURE/SUPERSTRUCTURE)
• Remove CalcDistance interface, not supported by milvus 2.4
• Remove Flush call in GetCollectionStats/GetPartitionStats/CreateIndex, milvus 2.4 doesn't allow calling Flush constantly
• Directly pass radius/range_filter for range search, no need to verify them on the client side
• CreateIndex() internally calls DescribeIndex() to check index state instead of GetIndexState()
• Remove client-side checks for index parameters and search parameters, let milvus server validate
• Deprecate ShowCollections, replaced by ListCollections
• Deprecate ShowPartitions, replaced by ListPartitions
• Rename GetVersion to GetServerVersion
• Link gRPC as a shared library instead of a static link
• Optional to build with external pre-installed gRPC lib
• Add more examples
• Simplify the project to reduce dependencies, only one dependency(gRPC) now