Fix PVC selection to enable update of VolumeReclaimPolicy of PV

[splisson-altair]

The function was using the hardcoded example-elasticsearch cluster name

[gianrubio]

This PR broke the master branch, elasticsearch nodes never start up because Probes are failing. If you didn't setup the use-ssl flag golang will assume the var value as false

                 node.alpha.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason      Age                  From                                                Message
  ----     ------      ----                 ----                                                -------
  Warning  Unhealthy   5m (x2941 over 17h)  kubelet, ip-10-120-0-10.eu-west-1.compute.internal  Liveness probe failed: Get http://100.96.3.11:9200/_nodes/_local: EOF
  Warning  FailedSync  2s (x2476 over 17h)  kubelet, ip-10-120-0-10.eu-west-1.compute.internal  Error syncing pod

[gianrubio]

@splisson-altair you also missed to disable ssl in cerebro deployment

[splisson-altair]

the use-ssl part should not have ended up here, my bad.
I'll have a look, thanks

[splisson-altair]

@gianrubio I see your other pull request , I ll use it as a reference to fix this , ok ?

[splisson-altair]

I have not figured out how to make use-ssl default to yes since we're using struct without constructor for the cluster spec.