Fix coverage miss when running tests under ES 7

h/search/core.py

@@ -156,7 +156,7 @@ def _parse_aggregation_results(self, aggregations):
     @staticmethod
     def _get_total_hits(response):
         total = response["hits"]["total"]
-        if isinstance(total, int):
+        if isinstance(total, int):  # pragma: nocover
             # ES 6.x
             return total