Restrict IIIF search to words

Add type filtering on transcription search

arkindex/documents/api.py

@@ -336,7 +336,7 @@ class TranscriptionSearchAnnotationList(RetrieveAPIView):
         return ESQuerySet(
             query=ESQuerySet.make_query(
                 'elastic/search_transcriptions.json',
-                ctx={'query': self.request.query_params.get('q')},
+                ctx={'query': self.request.query_params.get('q'), 'type': 'word'},
             ),
             es_index=settings.ES_INDEX_TRANSCRIPTIONS,
             es_type=Transcription.INDEX_TYPE,