docs: function (activeState) {
          var coordSys = this.coordinateSystem;
          var data = this.getData();
          var indices = [];
  
          coordSys.eachActiveState(data, function (theActiveState, dataIndex) {
              if (activeState === theActiveState) {
                  indices.push(data.getRawIndex(dataIndex));
              }
          });
  
          return indices;
      }