test: Use Strong consistency level verifying count(*) (milvus-io#32031)

See also milvus-io#32030

Signed-off-by: Congqi Xia <[email protected]>

tests/restful_client_v2/testcases/test_vector_operations.py

@@ -2036,8 +2036,7 @@ def test_delete_vector_by_custom_pk_field(self):
         rsp = self.vector_client.vector_delete(payload)
 
         # query data after delete
-        time.sleep(1)
-        res = c.query(expr="", output_fields=["count(*)"])
+        res = c.query(expr="", output_fields=["count(*)"], consistency_level="Strong")
         logger.info(f"res: {res}")
         assert res[0]["count(*)"] == 0
 
@@ -2097,8 +2096,7 @@ def test_delete_vector_by_filter_custom_field(self):
         rsp = self.vector_client.vector_delete(payload)
 
         # query data after delete
-        time.sleep(1)
-        res = c.query(expr="", output_fields=["count(*)"])
+        res = c.query(expr="", output_fields=["count(*)"], consistency_level="Strong")
         logger.info(f"res: {res}")
         assert res[0]["count(*)"] == 0