{
  "description" : "zeek.tunnel",
  "processors" : [
    { "set": { "field": "event.dataset", "value": "tunnel" } },
    { "remove":         { "field": ["host"],     "ignore_failure": true                                                                  } },
    { "pipeline":       { "name": "zeek.tunnels"                                                                                 } }
  ]
}