Twitter::NullObject objects should not be passed through to LS

[andrewvc]

On Jruby this gem will return objects with a class of Twitter::NullObject, this is not encodable by JrJackson, and is just not a great idea. This gem should attempt to return all data as standard ruby objects to logstash.

Please see ticket elastic/logstash#3289 for the original report.

[andrewvc]

Per my discussion with @colinsurprenant I'll be implementing this by adding a monkey patch for Twitter::NullObject#to_json to help JrJackson serialize this.

[andrewvc]

This is actually suprisingly tricky due to the fact that Twitter::NullObect inherits from Naught which breaks JrJackson.

I've opened two issues regarding this:
guyboertje/jrjackson#39
sferik/twitter-ruby#704

[andrewvc]

This issue is waiting on a logstash release that incorporates JrJackson 0.2.9.

[andrewvc]

Just leaving a note here, while Logstash 1.5.3 fixes this with a newer JrJackson, its market penetration isn't too high. There's no urgency here, but we should update this in the next few months.