fix link name in platform job config

Author: markdboyd

jobs/elasticsearch-platform/templates/config/config.yml.erb

@@ -27,12 +27,12 @@ opendistro_security:
 
 <%
   cluster_name = nil
-  if_link("elasticsearch") { |elasticsearch_link| cluster_name = elasticsearch_link.p("elasticsearch.cluster_name") }
+  if_link("elasticsearch-platform") { |elasticsearch_link| cluster_name = elasticsearch_link.p("elasticsearch.cluster_name") }
   unless cluster_name
     cluster_name = p("elasticsearch.cluster_name")
   end
   master_hosts = nil
-  if_link("elasticsearch") { |elasticsearch_link| master_hosts = elasticsearch_link.instances.map {|e| e.address }.join(',') }
+  if_link("elasticsearch-platform") { |elasticsearch_link| master_hosts = elasticsearch_link.instances.map {|e| e.address }.join(',') }
   unless master_hosts
     master_hosts = p("elasticsearch.master_hosts").join(',')
   end