Convert groovy script to painless ( collect)

[weltenwort (Felix Stürmer)]

hm, this works for me in Kibana 5.4.3:

GET example/_search
{
  "script_fields": {
    "checks": {
      "script": {
        "lang": "painless",
        "inline": "params._source['members'].collect(member -> member.check)"
      }
    }
  }
}