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/server/cluster.yml b/elasticsearch/server/cluster.yml
index 8f53f21..9be44ed 100644
--- a/elasticsearch/server/cluster.yml
+++ b/elasticsearch/server/cluster.yml
@@ -5,6 +5,7 @@
   _param:
     java_environment_version: "8"
     java_environment_platform: openjdk
+    elasticsearch_cluster_name: elasticsearch
   linux:
     system:
       sysctl:
@@ -15,6 +16,7 @@
       headless: true
   elasticsearch:
     server:
+      name: ${_param:elasticsearch_cluster_name}
       enabled: true
       master: true
       data: true