code: def reindex_multifiles(portal):
      
      logger.info("Reindexing Multifiles ...")
  
      brains = api.search(dict(portal_type="Multifile"), "bika_setup_catalog")
      total = len(brains)
  
      for num, brain in enumerate(brains):
          if num % 100 == 0:
              logger.info("Reindexing Multifile: {0}/{1}".format(num, total))
          obj = api.get_object(brain)
          obj.reindexObject()
docs: Reindex Multifiles to be searchable by the catalog