diff --git a/internal/proxy/task_index.go b/internal/proxy/task_index.go
index b10feece36074..43add9b112f61 100644
--- a/internal/proxy/task_index.go
+++ b/internal/proxy/task_index.go
@@ -171,7 +171,7 @@ func (cit *createIndexTask) parseIndexParams() error {
 		} else {
 			return merr.WrapErrParameterInvalid("supported field",
 				fmt.Sprintf("create index on %s field", cit.fieldSchema.DataType.String()),
-				"create index on json field is not supported")
+				fmt.Sprintf("create index on %s field is not supported", cit.fieldSchema.DataType.String()))
 		}
 	}
 
diff --git a/tests/python_client/testcases/test_index.py b/tests/python_client/testcases/test_index.py
index c951c2300a705..fe094538ae443 100644
--- a/tests/python_client/testcases/test_index.py
+++ b/tests/python_client/testcases/test_index.py
@@ -1343,8 +1343,8 @@ def test_create_index_json(self):
                                                                       dim=ct.default_dim, is_index=False)[0:4]
         collection_w.create_index(ct.default_json_field_name, index_params=ct.default_flat_index,
                                   check_task=CheckTasks.err_res,
-                                  check_items={ct.err_code: 1,
-                                               ct.err_msg: "create index on json field is not supported"})
+                                  check_items={ct.err_code: 1100,
+                                               ct.err_msg: "create index on JSON field is not supported"})
 
 
 @pytest.mark.tags(CaseLabel.GPU)