Add ES https support for telegraf

Change-Id: I8041de6b9ccb00edd95cb1aef3f9f436245de4ee
Related-PROD: PROD-30841
diff --git a/elasticsearch/meta/telegraf.yml b/elasticsearch/meta/telegraf.yml
index 2fc3166..d73bb94 100644
--- a/elasticsearch/meta/telegraf.yml
+++ b/elasticsearch/meta/telegraf.yml
@@ -28,7 +28,7 @@
     elasticsearch:
       template: elasticsearch/files/telegraf.conf
       servers:
-      - "http://{{ client.server.host }}:{{ client.server.get('port', 9200) }}"
+      - "{{ client.server.get('scheme', 'http') }}://{{ client.server.host }}:{{ client.server.get('port', 9200) }}"
       cluster_health: true
       cluster_stats: false
       local: false