is there a way to split a logstash (1.4.2) event into multiple other events?

My input looks like this:

```
{ "parts" => ["one", "two"],
  "timestamp" => "2014-09-27T12:29:17.601Z"
  "one.key=> "1", "one.value"=>"foo",
  "two.key" => "2", "two.value"=>"bar"
}

```

And I'd like to create two events with the following content:

```
{ "key" => "1", "value" => "foo", "timestamp" => "2014-09-27T12:29:17.601Z" }
{ "key" => "2", "value" => "bar", "timestamp" => "2014-09-27T12:29:17.601Z" }

```

Problem is that I can't know the actual "parts"...

Thanks for your help :)