title: Metrics not visible in prometheus
body: <p>I am using elastic search exporter to pull elastic search metrics to prometheus.
  I installed the helm chart and could see the metrics on <a href="http://127.0.0.1:9108/metrics" rel="nofollow noreferrer">http://127.0.0.1:9108/metrics</a> with port forwarding.
  But i don't see any metrics coming to prometheus.
  Can someone please tell me where to start troubleshooting the issue?</p>