possibility of switching to generic ES-cluster if exist

when SL service defined, default OSS-ElasticSearch cluster turned off
and switched to SL Elasticsearch to avoid duplicating
related us: https://mirantis.jira.com/browse/PROD-14954

Change-Id: I32f2d982179a0f661f23edaaf672f035a16f0160
diff --git a/elasticsearch/client/single.yml b/elasticsearch/client/single.yml
index d9ce432..c4e2b43 100644
--- a/elasticsearch/client/single.yml
+++ b/elasticsearch/client/single.yml
@@ -6,3 +6,4 @@
       enabled: true
       server:
         host: ${_param:stacklight_log_address}
+        port: ${_param:haproxy_elasticsearch_http_bind_port}