Highcharts - 如何强制dataLabels在重叠内容时显示标签

Question

我需要显示所有数据（即使一个数据与另一个重叠），但是当框非常接近时，自动消失：

documentation推荐allowOverlap，但是当我使用时出现两个值Min和Max，但我只需要Min：

plotOptions: {
    series: {
        dataLabels: {
            enabled: true,
            allowOverlap: true
        }
    }
}

完整代码：

$(function() {

  $('#container').highcharts({

    chart: {
      type: 'columnrange',
      inverted: false,
    },

    xAxis: {
      categories: ['Title 1', 'Title 2', 'Title 3', 'Title 4', 'Title 5'],
      alternateGridColor: '#F6F9FC',
    },

    tooltip: {
      shared: true,
      width: 20,
      formatter: function() {
        var retorno = '<strong>Prices</strong>';

        $.each(this.points, function(i, point) {
          if (point.series.name == 'Min' || point.series.name == 'Med' || point.series.name == 'Max') {
            retorno += '<br /><span style="color:' + point.color + '">u25CF</span> ' + point.series.name + ': ' + point.y;
          }
        });

        return retorno;
      }
    },

    plotOptions: {
      columnrange: {
        grouping: false,
        pointWidth: 70
      },
      series: {
        lineWidth: 0.5
      }
    },

    series: [

      // Min
      {
        name: 'Min',
        color: '#C30000',
        minPointLength: 25,
        data: [
          [2000, 2001],
          [5000, 5001],
          [1000, 1001],
          [8000, 8001],
          [3500, 3501]
        ],
        dataLabels: {
          inside: true,
          enabled: true,
          align: 'right',
          format: '{point.y}',
        }
      }, {
        name: 'Min (Line)',
        color: '#C30000',
        type: 'spline',
        dashStyle: 'shortdot',
        data: [
          [2000],
          [5000],
          [1000],
          [8000],
          [3500]
        ]
      },

      // Med
      {
        name: 'Med',
        color: '#215994',
        minPointLength: 25,
        data: [
          [3000, 3001],
          [6001, 6002],
          [3001, 3002],
          [9001, 9002],
          [4001, 4160]
        ],
        dataLabels: {
          enabled: true,
          inside: true,
          align: 'center',
          format: '{point.y}'

        }
      }, {
        name: 'Med (Line)',
        color: '#215994',
        type: 'spline',
        dashStyle: 'shortdot',
        data: [
          [3000],
          [6001],
          [3001],
          [9001],
          [4001]
        ]
      },

      // Max
      {
        name: 'Max',
        color: '#ECEC09',
        minPointLength: 25,
        data: [
          [4000, 4001],
          [7001, 7002],
          [5001, 5002],
          [9501, 9502],
          [4501, 4502]
        ],
        dataLabels: {
          enabled: true,
          inside: true,
          align: 'left',
          format: '{point.y}'
        }
      }, {
        name: 'Max (Line)',
        color: '#ECEC09',
        type: 'spline',
        dashStyle: 'shortdot',
        data: [
          [4000],
          [7001],
          [5001],
          [9501],
          [4501]
        ]
      }

    ]

  });

});