[Bug]: Describe index on a vector field but lists indexes on all vector fields

[ThreadDao]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

1. create collection with 4 vector fields: float32, fp16, bf16, vector
2. insert data and flush
3. create index on all vector fields
4. describe index on float32 vector field, but return all vector fields's index

16:30:34 milvus_client.go:14: (ApiRequest): func [DescribeIndex], args: [context.Background.WithDeadline(2024-03-29 16:34:18.036644095 +0800 CST m=+240.003684713 [3m43.604197212s]) aFfC floatVec []]
2024/03/29 16:30:34 milvus_client.go:21: (ApiResponse): func [DescribeIndex], results: [[{{HNSW floatVec} map[index_type:HNSW metric_type:L2 params:{"M":"8","efConstruction":"96"}]} {{BIN_IVF_FLAT binaryVec} map[index_type:BIN_IVF_FLAT metric_type:JACCARD params:{"nlist":"64"}]} {{HNSW fp16Vec} map[index_type:HNSW metric_type:L2 params:{"M":"8","efConstruction":"96"}]} {{HNSW bf16Vec} map[index_type:HNSW metric_type:L2 params:{"M":"8","efConstruction":"96"}]}]]
2024/03/29 16:30:34 index_test.go:124: map[index_type:HNSW metric_type:L2 params:{"M":"8","efConstruction":"96"}] HNSW
2024/03/29 16:30:34 index_test.go:124: map[index_type:BIN_IVF_FLAT metric_type:JACCARD params:{"nlist":"64"}] BIN_IVF_FLAT
2024/03/29 16:30:34 index_test.go:124: map[index_type:HNSW metric_type:L2 params:{"M":"8","efConstruction":"96"}] HNSW
2024/03/29 16:30:34 index_test.go:124: map[index_type:HNSW metric_type:L2 params:{"M":"8","efConstruction":"96"}] HNSW

• case:

func TestDescribeIndexMultiVectors(t *testing.T) {
	ctx := createContext(t, time.Second*common.DefaultTimeout*2)
	// connect
	mc := createMilvusClient(ctx, t)
	// create -> insert [0, 3000) -> flush -> index -> load
	cp := CollectionParams{CollectionFieldsType: AllFields, AutoID: false, EnableDynamicField: true,
		ShardsNum: common.DefaultShards, Dim: common.DefaultDim}

	dp := DataParams{DoInsert: true, CollectionFieldsType: AllFields, start: 0, nb: common.DefaultNb * 2,
		dim: common.DefaultDim, EnableDynamicField: true}

	// create index for all vector fields
	ips := GenDefaultIndexParamsForAllVectors()

	collName := prepareCollection(ctx, t, mc, cp, WithDataParams(dp), WithIndexParams(ips), WithCreateOption(client.WithConsistencyLevel(entity.ClStrong)))
	indexes, err := mc.DescribeIndex(ctx, collName, common.DefaultFloatVecFieldName)
	common.CheckErr(t, err, true)
	for _, idx := range indexes {
		log.Println(idx.Params(), idx.IndexType())
	}
}

Expected Behavior

No response

Steps To Reproduce

No response

Environment

4am pods:

zong-go-master-2-etcd-0                                           1/1     Running                           0               24h
zong-go-master-2-kafka-0                                          1/1     Running                           0               24h
zong-go-master-2-kafka-1                                          1/1     Running                           0               24h
zong-go-master-2-kafka-2                                          1/1     Running                           0               24h
zong-go-master-2-kafka-zookeeper-0                                1/1     Running                           0               24h
zong-go-master-2-kafka-zookeeper-1                                1/1     Running                           0               24h
zong-go-master-2-kafka-zookeeper-2                                1/1     Running                           0               24h
zong-go-master-2-milvus-standalone-dbc9cf5b4-6k222                1/1     Running                           3 (45m ago)     24h
zong-go-master-2-minio-669b58dcd8-gw7zz                           1/1     Running                           0               24h

### Anything else?

_No response_

[ThreadDao]

/assign @congqixia

[ThreadDao]

fixed