1 AmCharts.addInitHandler( function(chart){
 2     if (chart.orderByField === undefined){
 3         return;
 4     }
 5     chart.dataProvider.sort(function(a,b){
 6         if (a[ chart.orderByField ] > b[ chart.orderByField ]){
 7             return -1;
 8         }
 9         else if ( a[ chart.orderByField ] == b[ chart.orderByField ]){
10             return 0;
11         }
12         return 1;
13     });
14 }, ["serial"]);

var chart = AmCharts.makeChart( "chartdiv", {
  "type": "serial",
  "theme": "light",
  "dataProvider": data,
  "categoryField": "key",
  "sortColumns": true,
  "orderByField": "doc_count",
  "graphs": [ {
    "balloonText": "[[category]]: <b> [[value]] </b>",
    "valueField": "doc_count",
    "fillColorsField": "color",
    "fillAlphas": 0.9,
    "fillAlpha": 0.2,
    "type": "column"
  } ],
  "categoryAxis": {
    "gridPosition": "start",
    "labelRotation": 45
  }
});