code: def advanced_search(args)
        raise ArgumentError.new("Args cannot be blank") if args.nil? || args.empty?
  
        request_path = "#{base_url}/advanced_search?#{Rack::Utils.build_nested_query(args)}"
        get_json(request_path)
      end
docs: Advanced search.
  
   @deprecated Only in use by Whitehall. Use the `#search` method.