# File lib/ferret/index.rb, line 588
588:     def persist(directory, create = true)
589:       synchronize do
590:         flush()
591:         old_dir = @dir
592:         if directory.is_a?(String)
593:           @dir = FSDirectory.new(directory, create)
594:         elsif directory.is_a?(Ferret::Store::Directory)
595:           @dir = directory
596:         end
597:         @dir.extend(MonitorMixin)
598:         @options[:dir] = @dir
599:         @options[:create_if_missing] = true
600:         add_indexes([old_dir])
601:       end
602:     end