[skip ci] Cluster name fixed

Author: Chris Wiechmann

env-sample

@@ -296,7 +296,7 @@ MEMCACHED=memcached:11211
 # you might end up with nodes joining the wrong cluster.
 # Good examples are: axway-apim-elasticsearch-prod, axway-apim-elasticsearch-qa, etc.
 # Used-By: Elasticsearch
-ELASTICSEARCH_CLUSTERNAME="Axway APIM"
+ELASTICSEARCH_CLUSTERNAME=Axway APIM
 
 # ----------------------------------------------------------------------------------------------
 # Define the version of the Elastic-Stack to use. Based on this version Docker images are pulled