About once a week, messages sent from this plugin to logstash get dropped into the dead letter queue with this error:

object mapping for [host] tried to parse field [host] as object, but found
�dhost�torg.jruby.RubyStringm10.193.119.13�dtags�x�org.logstash.ConvertedList��torg.jruby.RubyStringq_jsonparsefailure��torg.jruby.RubyStringn_rub

This error typically means you are not properly quoting the JSON string. What's also strange is why does the plugin not always send the host variable?