docs: def _indexable_tags(self):
          """Index tag ids for tags defined in this Entity's default tags
          namespace."""
          tags = current_app.extensions.get("tags")
          if not tags or not tags.supports_taggings(self):
              return ""
  
          default_ns = tags.entity_default_ns(self)
          return [t for t in tags.entity_tags(self) if t.ns == default_ns]