grafana/public/app/plugins/datasource/elasticsearch/config_ctrl.ts

import _ from 'lodash';

export class ElasticConfigCtrl {
  static templateUrl = 'public/app/plugins/datasource/elasticsearch/partials/config.html';
  current: any;

  /** @ngInject */
  constructor($scope) {
    this.current.jsonData.timeField = this.current.jsonData.timeField || '@timestamp';
    this.current.jsonData.esVersion = this.current.jsonData.esVersion || 5;
    this.current.jsonData.maxConcurrentShardRequests = this.current.jsonData.maxConcurrentShardRequests || 256;
  }

  indexPatternTypes = [
    {name: 'No pattern',  value: undefined},
    {name: 'Hourly',      value: 'Hourly',  example: '[logstash-]YYYY.MM.DD.HH'},
    {name: 'Daily',       value: 'Daily',   example: '[logstash-]YYYY.MM.DD'},
    {name: 'Weekly',      value: 'Weekly',  example: '[logstash-]GGGG.WW'},
    {name: 'Monthly',     value: 'Monthly', example: '[logstash-]YYYY.MM'},
    {name: 'Yearly',      value: 'Yearly',  example: '[logstash-]YYYY'},
  ];

  esVersions = [
    {name: '2.x', value: 2},
    {name: '5.x', value: 5},
    {name: '5.6+', value: 56},
  ];

  indexPatternTypeChanged() {
    var def = _.find(this.indexPatternTypes, {value: this.current.jsonData.interval});
    this.current.database = def.example || 'es-index-name';
  }
}