# File lib/ferret/index.rb, line 449
449:     def query_delete(query)
450:       @dir.synchrolock do
451:         ensure_writer_open()
452:         ensure_searcher_open()
453:         query = do_process_query(query)
454:         @searcher.search_each(query) do |doc, score|
455:           @reader.delete(doc)
456:         end
457:         flush() if @auto_flush
458:       end
459:     end