         # File lib/ferret/index.rb, line 194
    194:     def highlight(query, doc_id, options = {})
    195:       @dir.synchronize do
    196:         ensure_searcher_open()
    197:         @searcher.highlight(do_process_query(query),
    198:                             doc_id,
    199:                             options[:field]||@options[:default_field],
    200:                             options)
    201:       end
    202:     end