chef logstash filter for nginx json logs

gistfile1.txt

node.override['logstash']['server'].filters = [

  { "json" => {
      "source" => "message"
    }
  },
  { "date" => {
      "match" => [ "time_local", "dd/MMM/YYYY:HH:mm:ss +0000",   "dd/MMM/YYYY:HH:mm:ss"],
      "remove_field" => "time_local"
     }
  },
  { "useragent" => {
     "source" => "http_user_agent",
     "target" => "ua"
    }
  },
  {
    "geoip" => {
       "source" => "remote_addr"
     }
  },
  {
    "grok" => {
	"match" => [ "request", "%{WORD:request_method} %{URIPATH:request_uri}(?:%{URIPARAM:request_querystring})?" ]
     }
  }
}