I'm trying to update the **comment\_delete = 'false'** to **'true'** on the second object within an array. Help Please .... 

```html

"_id" : "jLkRdxocZzheefWF3",
 "comments" : [
  {
   "comment_id" : "\u0003624334",
   "comment" : " test",
   "user" : "peter pan",
   "userId" : "MQtp4i8bZeLYSLbr5",
   "comment_delete" : "false"
  },
  {
   "comment_id" : "\u0007973101",
   "comment" : " add",
   "user" : "peter pan",
   "userId" : "MQtp4i8bZeLYSLbr5",
   "comment_delete" : "false"
  }
 ],

}
```