[skip ci] extension: change signal registration to comply with new invenio-indexer version

cern_search_rest_api/modules/cernsearch/ext.py

@@ -7,7 +7,7 @@
 # granted to it by virtue of its status as Intergovernmental Organization
 # or submit itself to any jurisdiction.
 
-from invenio_indexer.signals import before_record_index_arguments
+from invenio_indexer.signals import before_record_index
 
 from cern_search_rest_api.modules.cernsearch.indexer import csas_indexer_receiver
 from cern_search_rest_api.modules.cernsearch.views import build_blueprint
@@ -26,7 +26,7 @@ class CERNSearch(object):
         self.init_config(app)
         blueprint = build_blueprint(app)
         app.register_blueprint(blueprint)
-        before_record_index_arguments.connect(csas_indexer_receiver, sender=app)
+        before_record_index.connect(csas_indexer_receiver, sender=app)
         app.extensions["cern-search"] = self
 
     def init_config(self, app):