code: function (subType) {
          var series = this._componentsMap.get('series');
          return filter(series, function (oneSeries) {
              return oneSeries.subType === subType;
          });
      }
docs: Get series list before filtered by type.
  FIXME: rename to getRawSeriesByType?
  
  @param {string} subType
  @return {Array.<module:echarts/model/Series>}