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To display indexLabel only for specific index value (in your case 1), you can check the index of the indexLabel in indexLabelFormatter function and display the same. Please take a look at the code snippet below.

indexLabelFormatter: function ( e ) {
          if(e.index === 1 && e.dataPoint.dataPointLabel)
            return e.dataPoint.dataPointLabel;
            return " ";

Also, take a look at this JSFiddle for complete code.

Hide indexLabel value for specific index of Range Area Chart

Manoj Mohan
Team CanvasJS