how to hide stackLabels for non column series type in Highchart js?

how to hide stackLabel for spline in this example Как скрыть вывод суммы для сплайна?

Highcharts.chart("container", {
  title: {
        text: '$name'
    },
     tooltip: {
        headerFormat: '<b>{point.x}</b><br/>',
        pointFormat: '{series.name}: <b>{point.y}</b>'
    },
    xAxis: {
      categories: ['item 1', 'item 2', 'item 3', 'item 4', 'item 5']
    },
    yAxis: {
        min: 0,
        title: {
            text: ''
        },
        stackLabels: {
                type:'column',
            enabled: true,
            style: {
                fontWeight: 'bold',
                color: (Highcharts.theme && Highcharts.theme.textColor) || 'gray'
            }
        }
    },
    plotOptions: {
      series: {
        stacking: 'normal'
      }
    },
    series: [{
      type: 'column',
      name: 'Item 1 of stacked bar charts',
      data: [3, 2, 1, 3, 4]
    }, {
      type: 'column',
      name: 'Item 2 of stacked bar charts',
      data: [2, 3, 5, 7, 6]
    }, {
      type: 'column',
      name: 'Item 3 of stacked bar charts',
      data: [4, 3, 3, 9, 2]
    }, {
      type: 'spline',
      name:"Revenue",
      data: [15, 2, 3, 4, 5]
    }],
});