Fix asyncio bug in test fixtures

Author: JoshMock

test_elasticsearch_serverless/test_async/test_server/conftest.py

@@ -16,6 +16,7 @@
 #  under the License.
 
 import pytest
+import pytest_asyncio
 
 import elasticsearch_serverless
 
@@ -24,7 +25,7 @@
 pytestmark = pytest.mark.asyncio
 
 
-@pytest.fixture(scope="function")
+@pytest_asyncio.fixture(scope="function")
 @pytest.mark.usefixtures("sync_client")
 async def async_client(elasticsearch_url):
     # 'sync_client' fixture is used for the guaranteed wipe_cluster() call.