grafana/public/app/plugins/datasource/elasticsearch/metricAgg.js

define([
  'angular',
  'lodash',
  './queryDef'
],
function (angular, _, queryDef) {
  'use strict';

  var module = angular.module('grafana.directives');

  module.controller('ElasticMetricAggCtrl', function($scope, uiSegmentSrv, $q) {
    var metricAggs = $scope.target.metrics;

    $scope.metricAggTypes = queryDef.metricAggTypes;

    $scope.init = function() {
      $scope.agg = metricAggs[$scope.index];
      if (!$scope.agg.field) {
        $scope.agg.field = 'select field';
      }
    }

    $scope.$watchCollection("target.metrics", function() {
      $scope.isFirst = $scope.index === 0;
      $scope.isLast = $scope.index === metricAggs.length - 1;
      $scope.isSingle = metricAggs.length === 1;
    });

    $scope.toggleOptions = function() {
      $scope.showOptions = !$scope.showOptions;
    }

    $scope.addMetricAgg = function() {
      var addIndex = metricAggs.length;

      var id = _.reduce($scope.target.bucketAggs.concat($scope.target.metrics), function(max, val) {
        return parseInt(val.id) > max ? parseInt(val.id) : max;
      }, 0);

      metricAggs.splice(addIndex, 0, {type: "count", field: "select field", id: (id+1).toString()});
    };

    $scope.removeMetricAgg = function() {
      metricAggs.splice($scope.index, 1);
      $scope.onChange();
    };

    $scope.init();

  });

});