I have different logs in elasticsearch 2.2 separate by 'type'. How can delete all data, only one of type, older one week? thanks

Example of logs:

```js
{
  "_index": "logstash-2016.02.23",
  "_type": "dns_ns",
  "_id": "AVMOj--RqgDl5Axva2Nt",
  "_score": 1,
  "_source": {
    "@version": "1",
    "@timestamp": "2016-02-23T14:37:07.029Z",
    "type": "dns_ns",
    "host": "11.11.11.11",
    "clientip": "22.22.22.22",
    "queryname": "api.bing.com",
    "zonetype": "Public_zones",
    "querytype": "A",
    "querytype2": "+ED",
    "dnsip": "33.33.33.33"
  },
  "fields": {
    "@timestamp": [
      1456238227029
    ]
  }
}
```