[2021/06/22 23:23:53.032] ERROR [0.031s]: test_Unacknowledged_write_using_dollar-prefixed_or_dotted_keys_may_be_silently_rejected_on_pre-5_0_server (test_crud_unified.TestUnifiedReplaceOneDotsAndDollars)
 [2021/06/22 23:23:53.032] ----------------------------------------------------------------------
 [2021/06/22 23:23:53.032] Traceback (most recent call last):
 [2021/06/22 23:23:53.032]   File "/data/mci/048e1cba14b827a845d0ff7a90a41169/src/test/unified_format.py", line 1114, in test_case
 [2021/06/22 23:23:53.032]     self.run_scenario(spec)
 [2021/06/22 23:23:53.032]   File "/data/mci/048e1cba14b827a845d0ff7a90a41169/src/test/unified_format.py", line 1098, in run_scenario
 [2021/06/22 23:23:53.032]     self.run_operations(spec['operations'])
 [2021/06/22 23:23:53.032]   File "/data/mci/048e1cba14b827a845d0ff7a90a41169/src/test/unified_format.py", line 1030, in run_operations
 [2021/06/22 23:23:53.032]     self.run_entity_operation(op)
 [2021/06/22 23:23:53.032]   File "/data/mci/048e1cba14b827a845d0ff7a90a41169/src/test/unified_format.py", line 914, in run_entity_operation
 [2021/06/22 23:23:53.032]     actual = coerce_result(opname, result)
 [2021/06/22 23:23:53.032]   File "/data/mci/048e1cba14b827a845d0ff7a90a41169/src/test/unified_format.py", line 619, in coerce_result
 [2021/06/22 23:23:53.032]     'matchedCount': result.matched_count,
 [2021/06/22 23:23:53.032]   File "/data/mci/048e1cba14b827a845d0ff7a90a41169/src/pymongo/results.py", line 114, in matched_count
 [2021/06/22 23:23:53.032]     self._raise_if_unacknowledged("matched_count")
 [2021/06/22 23:23:53.032]   File "/data/mci/048e1cba14b827a845d0ff7a90a41169/src/pymongo/results.py", line 31, in _raise_if_unacknowledged
 [2021/06/22 23:23:53.032]     raise InvalidOperation("A value for %s is not available when "
 [2021/06/22 23:23:53.032] pymongo.errors.InvalidOperation: A value for matched_count is not available when the write is unacknowledged. Check the acknowledged attribute to avoid this error.