Revert "feat: store split modulestore's course indexes in Django/MySQL"

This reverts commit 96e5ff8dce.

lms/djangoapps/instructor/tests/test_tools.py

@@ -252,12 +252,12 @@ class TestSetDueDateExtension(ModuleStoreTestCase):
 
     def test_set_due_date_extension_invalid_date(self):
         extended = datetime.datetime(2009, 1, 1, 0, 0, tzinfo=UTC)
-        with pytest.raises(tools.DashboardError), self.allow_transaction_exception():
+        with pytest.raises(tools.DashboardError):
             tools.set_due_date_extension(self.course, self.week1, self.user, extended)
 
     def test_set_due_date_extension_no_date(self):
         extended = datetime.datetime(2013, 12, 25, 0, 0, tzinfo=UTC)
-        with pytest.raises(tools.DashboardError), self.allow_transaction_exception():
+        with pytest.raises(tools.DashboardError):
             tools.set_due_date_extension(self.course, self.week3, self.user, extended)
 
     def test_reset_due_date_extension(self):

lms/djangoapps/instructor/tests/views/test_instructor_dashboard.py

@@ -673,6 +673,6 @@ class TestInstructorDashboardPerformance(ModuleStoreTestCase, LoginEnrollmentTes
 
         # check MongoDB calls count
         url = reverse('spoc_gradebook', kwargs={'course_id': self.course.id})
-        with check_mongo_calls(6):
+        with check_mongo_calls(9):
             response = self.client.get(url)
             assert response.status_code == 200