fix(cleanup): removed unused js file

public/app/plugins/datasource/elasticsearch/directives.js

-define([
-  'angular',
-  './bucket_agg',
-  './metric_agg',
-],
-function (angular) {
-  'use strict';
-
-  var module = angular.module('grafana.directives');
-
-  module.directive('metricQueryEditorElasticsearch', function() {
-    return {controller: 'ElasticQueryCtrl', templateUrl: 'app/plugins/datasource/elasticsearch/partials/query.editor.html'};
-  });
-
-  module.directive('metricQueryOptionsElasticsearch', function() {
-    return {templateUrl: 'app/plugins/datasource/elasticsearch/partials/query.options.html'};
-  });
-
-  module.directive('annotationsQueryEditorElasticsearch', function() {
-    return {templateUrl: 'app/plugins/datasource/elasticsearch/partials/annotations.editor.html'};
-  });
-
-  module.directive('elastic', function() {
-    return {templateUrl: 'app/plugins/datasource/elasticsearch/partials/config.html'};
-  });
-
-  module.directive('elasticMetricAgg', function() {
-    return {
-      templateUrl: 'app/plugins/datasource/elasticsearch/partials/metric_agg.html',
-      controller: 'ElasticMetricAggCtrl',
-      restrict: 'E',
-      scope: {
-        target: "=",
-        index: "=",
-        onChange: "&",
-        getFields: "&",
-        esVersion: '='
-      }
-    };
-  });
-
-  module.directive('elasticBucketAgg', function() {
-    return {
-      templateUrl: 'app/plugins/datasource/elasticsearch/partials/bucket_agg.html',
-      controller: 'ElasticBucketAggCtrl',
-      restrict: 'E',
-      scope: {
-        target: "=",
-        index: "=",
-        onChange: "&",
-        getFields: "&",
-      }
-    };
-  });
-
-});