[Bug]: [milvus_client] Get interface returns empty when "ids" is a list of string for string primary key

[binbinlv]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Get interface returns empty when "ids" is a list of string for string primary key

[2024-04-26 15:51:44 - DEBUG - ci_test]: (api_request)  : [MilvusClient.get] args: ['milvus_client_api_query_TIafVN0a', ['0'], None], kwargs: {'timeout': 120} (api_request.py:62)
[2024-04-26 15:51:44 - DEBUG - ci_test]: (api_response) : []  (api_request.py:37)

Expected Behavior

Return filtered entities successfully

Steps/Code To Reproduce behavior

@pytest.mark.tags(CaseLabel.L1)
    def test_milvus_client_get_normal_string(self):
        """
        target: test get interface for string field
        method: create connection, collection, insert delete, and search
        expected: search/query successfully without deleted data
        """
        client = self._connect(enable_milvus_client_api=True)
        collection_name = cf.gen_unique_str(prefix)
        # 1. create collection
        client_w.create_collection(client, collection_name, default_dim, id_type="string", max_length=ct.default_length)
        # 2. insert
        rng = np.random.default_rng(seed=19530)
        rows = [
            {default_primary_key_field_name: str(i), default_vector_field_name: list(rng.random((1, default_dim))[0]),
             default_float_field_name: i * 1.0, default_string_field_name: str(i)} for i in range(default_nb)]
        client_w.insert(client, collection_name, rows)[0]
        pks = [str(i) for i in range(default_nb)]
        log.debug(pks)
        # 3. get first primary key
        first_pk_data = client_w.get(client, collection_name, ids=pks[0:1])[0]
        assert len(first_pk_data) == len(pks[0:1])
        first_pk_data_1 = client_w.get(client, collection_name, ids="0")[0]
        assert first_pk_data == first_pk_data_1

        client_w.drop_collection(client, collection_name)

Environment details

- Hardware/Softward conditions (OS, CPU, GPU, Memory):
- Method of installation (Docker, or from source):
- Milvus version (v0.3.1, or v0.4.0): master latest
- pymilvus version: 2.5.0rc17
- Milvus configuration (Settings you made in `server_config.yaml`):

Anything else?

No response

[binbinlv]

/assign @czs007