docs: def reindex(clear: bool, progressive: bool, batch_size: int):
      """Reindex all content; optionally clear index before.
  
      All is done in asingle transaction by default.
  
      :param clear: clear index content.
      :param progressive: don't run in a single transaction.
      :param batch_size: number of documents to process before writing to the
                       index. Unused in single transaction mode. If `None` then
                       all documents of same content type are written at once.
      """
      reindexer = Reindexer(clear, progressive, batch_size)
      reindexer.reindex_all()