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

define([
  'angular',
],
function (angular) {
  'use strict';

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

  module.controller('ElasticQueryCtrl', function($scope, $timeout, uiSegmentSrv) {

    $scope.init = function() {
      var target = $scope.target;
      if (!target) { return; }

      $scope.queryUpdated();
    };

    $scope.getFields = function(type) {
      var jsonStr = angular.toJson({find: 'fields', type: type});
      return $scope.datasource.metricFindQuery(jsonStr)
      .then(uiSegmentSrv.transformToSegments(false))
      .then(null, $scope.handleQueryError);
    };

    $scope.queryUpdated = function() {
      var newJson = angular.toJson($scope.datasource.queryBuilder.build($scope.target), true);
      if (newJson !== $scope.oldQueryRaw) {
        $scope.rawQueryOld = newJson;
        $scope.get_data();
      }

      $scope.appEvent('elastic-query-updated');
    };

    $scope.handleQueryError = function(err) {
      $scope.parserError = err.message || 'Failed to issue metric query';
      return [];
    };

    $scope.init();

  });

});