Fixup tests

arkindex/project/tests/test_elastic.py

@@ -42,4 +42,4 @@ class TestESDocuments(FixtureAPITestCase):
         element = self.corpus.elements.get(name='Volume 1')
         element.metadatas.create(type=MetaType.Reference, name='ref.', value='123ABC')
         es_document = ESElement.from_model(element)
-        self.assertCountEqual(es_document.reference, ['123abc'])
+        self.assertCountEqual(es_document.references, ['123abc'])