Allow for Elasticsearch Virtual service to be created

Had a community-contributor request the possibility to create a virtual service via the .values file similar to how a kibana-VS is currently deployed

Example:

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: elasticsearch
  namespace: logging
spec:
  hosts:
  - "example.com"
  gateways:
  - istio-system/public
  http:
  - route:
    - destination:
        host: logging-ek-es-http.logging.svc.cluster.local
        port:
          number: 9200