[stable/elastic-stack] Not possible to modify elastic url in Kibana config

[alb3rtobr]

Describe the bug
Kibana configuration does not use the elastic url provided in the values.yaml

Version of Helm and Kubernetes:

$ helm version
Client: &version.Version{SemVer:"v2.13.0", GitCommit:"79d07943b03aea2b76c12644b4b54733bc5958d6", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.13.0", GitCommit:"79d07943b03aea2b76c12644b4b54733bc5958d6", GitTreeState:"clean"}

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.0", GitCommit:"641856db18352033a0d96dbc99153fa3b27298e5", GitTreeState:"clean", BuildDate:"2019-03-25T15:53:57Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.2", GitCommit:"66049e3b21efe110454d67df4fa62b08ea79a19b", GitTreeState:"clean", BuildDate:"2019-05-16T16:14:56Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}

Which chart:
elastic-stack

What happened:
It is not possible to change the elastic url in the Kibana configuration. This is the kibana section in the values.yaml :

kibana:
 enabled: true
 env:
ELASTICSEARCH_URL: http://http.default.svc.cluster.local:9200

Kibana was not starting, and in the pod logs I found it trying to connect to a wrong url:

{"type":"log","@timestamp":"2019-06-04T10:24:25Z","tags":["warning","elasticsearch","admin"],"pid":1,"message":"Unable to revive connection: http://elasticsearch:9200/"}

Also, the first line of the log is the following:

{"type":"log","@timestamp":"2019-06-04T10:24:01Z","tags":["warning","elasticsearch","config","deprecation"],"pid":1,"message":"Config key \"url\" is deprecated. It has been replaced with \"hosts\""}

I found out that in Kibana 6.6, the config parameter ELASTICSEARCH_URL changed to ELASTICSEARCH_HOSTS. And Im using 6.7

The kibana chart shows the change:

env: {}
  ## All Kibana configuration options are adjustable via env vars.
  ## To adjust a config option to an env var uppercase + replace `.` with `_`
  ## Ref: https://www.elastic.co/guide/en/kibana/current/settings.html
  ## For kibana < 6.6, use ELASTICSEARCH_URL instead
  # ELASTICSEARCH_HOSTS: http://elasticsearch-client:9200
  # SERVER_PORT: 5601
  # LOGGING_VERBOSE: "true"
  # SERVER_DEFAULTROUTE: "/app/kibana"

files:
  kibana.yml:
    ## Default Kibana configuration from kibana-docker.
    server.name: kibana
    server.host: "0"
    ## For kibana < 6.6, use elasticsearch.url instead
elasticsearch.hosts: http://elasticsearch:9200

What you expected to happen:
Kibana should be configured using ELASTICSEARCH_HOSTS.

How to reproduce it (as minimally and precisely as possible):
Just try to install the chart as described in the instructions. Kibana will not start properly.

Thanks in advance!

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