Field name cannot contain '.'

Elastic Stack Logstash
48

Hi!

Im also stucking with the "dot in a field problem"
I installed the de_dot plugin and activated it in the filter section:

filter {
  de_dot {
    nested => true
  }
}

The plugin itself seems working as I tested to add some fields with a successfully result.
But it seems that the dots in a field are not replaced, here is an example output:

{
   "kind" => "NodeList",
   "apiVersion" => "v1",
   "metadata" => {
        "selfLink" => "/api/v1/nodes",
        "resourceVersion" => "3890942"
    },
       "items" => [
        [0] {
            "metadata" => {
            "name" => "172.28.50.151",
            "selfLink" => "/api/v1/nodes/172.28.50.151",
            "uid" => "a2a40d8e-438e-11e6-befd-326261363032",
            "resourceVersion" => "3890934",
            "creationTimestamp" => "2016-07-06T15:30:57Z",
                    "labels" => {
                    "**beta.kubernetes.io**/arch" => "amd64",
                    "**beta.kubernetes.io**/os" => "linux",
                    "**kubernetes.io**/hostname" => "172.28.50.151"
                },
                    "annotations" => {
                    "volumes.kubernetes.io/controller-managed-attach-detach" => "true"
                }
            },
           "spec" => {

The json input string seems to be valid, I checked it with an online json parser, here is an extract from the input:

{
  "kind": "NodeList",
  "apiVersion": "v1",
  "metadata": {
    "selfLink": "/api/v1/nodes",
    "resourceVersion": "3886292"
  },
  "items": [
    {
      "metadata": {
        "name": "172.28.50.151",
        "selfLink": "/api/v1/nodes/172.28.50.151",
        "uid": "a2a40d8e-438e-11e6-befd-326261363032",
        "resourceVersion": "3886286",
        "creationTimestamp": "2016-07-06T15:30:57Z",
        "labels": {
          "**beta.kubernetes**.io/arch": "amd64",
          "**beta.kubernetes.io**/os": "linux",
          "kubernetes.io/hostname": "172.28.50.151"
        },
        "annotations": {
          "volumes.kubernetes.io/controller-managed-attach-detach": "true"
        }
      },
      "spec": {

This is the error message I get:
"reason"=>"Field name [volumes.kubernetes.io/controller-managed-attach-detach] cannot contain '.'"}}}, :level=>:warn}