How do I add the new conditionals in the Chef config?

[iandexter]

How do I use the new conditional for "type" in the Chef configuration?

I currently use the following config:

...
    "agent": {
      "inputs": [
        {
          "file": {
            "path": ["/var/log/nginx/*log"],
            "exclude": ["*.gz"],
            "type": "nginx-access",
            "start_position": "beginning"
          }
        }
      ],
      "filters": [
        {
          "grok": {
            "type": "nginx-access",
            "match": [ "message", "%{IPORHOST:remote_addr} - %{USER:remote_user} \\[%{HTTPDATE:timestamp}\\] \\\"(?:%{WORD:http_verb} %{NOTSPACE:http_request}(?: HTTP/%{NUMBER:http_version})?|%{DATA:raw_http_request})\\\" %{NUMBER:http_status_code} (?:%{NUMBER:bytes_read}|-) %{QS:http_referer} %{QS:http_user_agent}"]
          }
        }
      ],
...

It appears to work, but I'm getting this in the logs:

{:timestamp=>"2014-12-28T13:10:20.495000+0000", :message=>"You are using a deprecated config setting \"type\" set in grok. Deprecated settings will continue to work, but are scheduled for removal from logstash in the future. You can achieve this same behavior with the new conditionals, like: `if [type] == \"sometype\" { grok { ... } }`. If you have any questions about this, please visit the #logstash channel on freenode irc.", :name=>"type", :plugin=><LogStash::Filters::Grok --->, :level=>:warn}

Thanks.