refactor(elasticsearch): mavg naming -> pipeline agg

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

@@ -22,7 +22,7 @@ function (angular, _, queryDef) {
     };
 
     $scope.updatePipelineAggOptions = function() {
-      $scope.pipelineAggOptions = queryDef.getMovingAverageOptions($scope.target);
+      $scope.pipelineAggOptions = queryDef.getPipelineAggOptions($scope.target);
     };
 
     $rootScope.onAppEvent('elastic-query-updated', function() {

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

@@ -92,7 +92,7 @@ function (_) {
       return false;
     },
 
-    getMovingAverageOptions: function(targets) {
+    getPipelineAggOptions: function(targets) {
       var self = this;
       var result = [];
       _.each(targets.metrics, function(metric) {

public/app/plugins/datasource/elasticsearch/specs/query_def_specs.ts

@@ -8,9 +8,9 @@ declare var QueryDef: any;
 
 describe('ElasticQueryDef', function() {
 
-  describe('getMovingAverageOptions', function() {
+  describe('getPipelineAggOptions', function() {
     describe('with zero targets', function() {
-      var response = QueryDef.getMovingAverageOptions([]);
+      var response = QueryDef.getPipelineAggOptions([]);
 
       it('should return zero', function() {
         expect(response.length).to.be(0);
@@ -25,7 +25,7 @@ describe('ElasticQueryDef', function() {
         ]
       };
 
-      var response = QueryDef.getMovingAverageOptions(targets);
+      var response = QueryDef.getPipelineAggOptions(targets);
 
       it('should return zero', function() {
         expect(response.length).to.be(2);
@@ -40,7 +40,7 @@ describe('ElasticQueryDef', function() {
         ]
       };
 
-      var response = QueryDef.getMovingAverageOptions(targets);
+      var response = QueryDef.getPipelineAggOptions(targets);
 
       it('should return zero', function() {
         expect(response.length).to.be(1);