docs: def searchable_object_types(self):
          """List of (object_types, friendly name) present in the index."""
          try:
              idx = self.index()
          except KeyError:
              # index does not exists: service never started, may happens during
              # tests
              return []
  
          with idx.reader() as r:
              indexed = sorted(set(r.field_terms("object_type")))
          app_indexed = self.app_state.indexed_fqcn
  
          return [(name, friendly_fqcn(name)) for name in indexed if name in app_indexed]