Logstash 2.3.0 causing problems with http es_bulk inputs

After upgrading to Logstash 2.3.0 our http input using the es_bulk codec stopped working. The only data passing through to redis or elastic is the meta blob. Downgrading to 2.2.3 fixed the issue. Is this a bug with the new pipeline processing or am I missing a configuration that needs to be changed for this input now?