Merge branch 'stale-read-create-elements' into 'master'

Fix stale read on CreateElements

Closes #813

See merge request !1443

arkindex/documents/api/elements.py

@@ -1343,6 +1343,7 @@ class ElementBulkCreate(CreateAPIView):
             return Element.objects.none()
         return Element \
             .objects \
+            .using('default') \
             .filter(corpus__in=Corpus.objects.writable(self.request.user)) \
             .only('id', 'corpus_id', 'image_id')