[indexPatterns/field] show the conflict indices as a list, not JSON

src/ui/public/field_editor/field_editor.html

@@ -179,7 +179,7 @@
 
   <div  ng-if="editor.conflictDescriptionsLength > 0">
     <p>
-      <i class="fa fa-warning text-warning"></i> 
+      <i class="fa fa-warning text-warning"></i>
       <strong>Field Type Conflict:</strong>
       The type of this field changes across indices. It is unavailable for many analysis functions. The indices per type are as follows:
       <table class="table">
@@ -189,7 +189,7 @@
       </thead>
       <tbody>
       <tr ng-repeat="(type, indices) in editor.field.conflictDescriptions">
-        <td>{{type}}</td> <td>{{indices}}</td>
+        <td>{{type}}</td> <td>{{indices.join(', ')}}</td>
       </tr>
       </tbody>
       </table>