anchor.diff:  --------------------------------------------------
   {
     "bytes": {
  -    "field": "foo"
  +    "field": "file.size"
     }
   }
   --------------------------------------------------
  
positive.code: .Set Options
  [options="header"]
  |======
  | Name      | Required  | Default  | Description
  | `field`   | yes       | -        | The field to insert, upsert, or update
  | `value`   | yes       | -        | The value to be set for the field
  | `override`| no        | true     | If processor will update fields with pre-existing non-null-valued field. When set to `false`, such fields will not be touched.
  |======
  
  [source,js]
  --------------------------------------------------
  {
    "set": {
      "field": "field1",
      "value": 582.1
    }
  }
  --------------------------------------------------
  
negative.code: --------------------------------------------------
  {
    "remove": {
      "field": ["user_agent", "url"]
    }
  }
  --------------------------------------------------
  