Create geo_point from nested coordinates

Elastic Stack Logstash
11

seems to be failing on the filter still

filter {
  split {
    field => "id"
  }
  mutate {
    add_field => { "[vehicle][location][lat]" => "%{vehicle.position.latitude}" }
    add_field => { "[vehicle][location][lon]" => "%{vehicle.position.longitude}" }
  }
  mutate {
    convert => {"[vehicle][location][lat]" => "float"}
    convert => {"[vehicle][location][lon]" => "float"}
  }
}

"2016-09-21T17:17:33.515000-0500", :message=>"Exception in pipelineworker, the pipeline stopped processing new events, please check your filter configuration and restart Logstash.", "exception"=>java.lang.ClassCastException: expecting List or Map, found class com.logstash.bivalues.NullBiValue, "backtrace"=>["com.logstash.Accessors.newCollectionException(Accessors.java:175)", "com.logstash.Accessors.fetch(Accessors.java:139)", "com.logstash.Accessors.findCreateTarget(Accessors.java:93)", "com.logstash.Accessors.set(Accessors.java:25)", "com.logstash.Event.setField(Event.java:156)", "com.logstash.ext.JrubyEventExtLibrary$RubyEvent.ruby_set_field(JrubyEventExtLibrary.java:144)",