code: private void updateAttributeInBackend(Attribute attr, Attribute updatedAttr) {
      MetaDataService meta = dataService.getMeta();
      meta.getConcreteChildren(attr.getEntity())
          .forEach(
              entityType ->
                  meta.getBackend(entityType).updateAttribute(entityType, attr, updatedAttr));
    }
docs: Updates an attribute's representation in the backend for each concrete {@link EntityType} that
  has the {@link Attribute}.
  
  @param attr current version of the attribute
  @param updatedAttr new version of the attribute