- do not set a default value for the aggregate with property since it is

dependent on the field
- added tooltips for "aggregate with" and "size" parameters

src/core_plugins/metric_vis/public/__tests__/metric_vis_controller.js

@@ -21,14 +21,7 @@ describe('metric vis', function () {
     $scope.processTableGroups({
       tables: [{
         columns: [{ title: 'Count' }],
-        rows: [[ { toString: () => formatter(4301021) } ]],
-        aggConfig: function () {
-          return {
-            fieldFormatter: function () {
-              return formatter;
-            }
-          };
-        }
+        rows: [[ { toString: () => formatter(4301021) } ]]
       }]
     });
 
@@ -44,14 +37,7 @@ describe('metric vis', function () {
           { title: '1st percentile of bytes' },
           { title: '99th percentile of bytes' }
         ],
-        rows: [[ { toString: () => formatter(182) }, { toString: () => formatter(445842.4634666484) } ]],
-        aggConfig: function () {
-          return {
-            fieldFormatter: function () {
-              return formatter;
-            }
-          };
-        }
+        rows: [[ { toString: () => formatter(182) }, { toString: () => formatter(445842.4634666484) } ]]
       }]
     });
 

src/ui/public/agg_types/controls/top_aggregate_and_size.html

@@ -2,18 +2,28 @@
   <div class="form-group">
     <label>
       Aggregate With
+      <kbn-info
+       info="Choose a strategy for combining multiple hits or a multi-valued field into a single metric."
+       placement="right">
+      </kbn-info>
     </label>
 
     <select
       required
       name="aggregate"
       ng-model="agg.params.aggregate"
-      ng-options="opt as opt.display disable when opt.disabled for opt in options| orderBy: 'display'"
+      ng-options="opt as opt.display disable when opt.disabled for opt in options| orderBy: 'display' track by opt.val"
       class="form-control"
     ></select>
   </div>
   <div class="form-group">
-    <label>Size</label>
+    <label>
+      Size
+      <kbn-info
+       info="Request top-K hits. Multiple hits will be combined via 'aggregate with'."
+       placement="right">
+      </kbn-info>
+    </label>
 
     <input
        required

src/ui/public/agg_types/controls/top_sort.html

@@ -23,7 +23,7 @@
      name="sortOrder"
      ng-model="agg.params.sortOrder"
      required
-     ng-options="opt as opt.display for opt in aggParam.options"
+     ng-options="opt as opt.display for opt in aggParam.options track by opt.val"
      class="form-control">
   </select>
 </div>

src/ui/public/agg_types/metrics/top_hit.js

@@ -57,7 +57,6 @@ export default function AggTypeMetricTopProvider(Private) {
       {
         name: 'aggregate',
         type: 'optioned',
-        default: 'concat',
         editor: aggregateAndSizeEditor,
         options: [
           {
@@ -169,16 +168,13 @@ export default function AggTypeMetricTopProvider(Private) {
         return null;
       }
       const path = agg.params.field.name;
-      let values = [];
 
-      for (const hit of hits) {
-        const hitValues = path === '_source' ? hit._source : agg.vis.indexPattern.flattenHit(hit, true)[path];
-        if (_.isArray(hitValues)) {
-          values.push(...hitValues);
-        } else {
-          values.push(hitValues);
-        }
-      }
+      let values = _(hits).map(hit => {
+        return path === '_source' ? hit._source : agg.vis.indexPattern.flattenHit(hit, true)[path];
+      })
+      .flatten()
+      .value();
+
       if (values.length === 1) {
         values = values[0];
       }