code: public S3 format(S3OutputFormat format) {
          String strFormat;
          switch (format) {
              case JSON_ARRAY:
                  strFormat = "json_array";
                  break;
              case JSON_NEW_LINE:
                  strFormat = "json_new_line";
                  break;
              case JSON_META:
              default:
                  strFormat = "json_meta";
                  break;
          }
          setParam("format", strFormat);
          return this;
      }
docs: /*
  Sets the output format for your data
  
  @param format one of the allowed S3 formats, defaults to json_meta
  @return this