Use the correct variable name

Author: afeefghannam89

molecule/elasticsearch_roles_calculation/converge.yml

@@ -8,7 +8,7 @@
   vars:
     elasticsearch_jna_workaround: true
     elasticsearch_disable_systemcallfilterchecks: true
-    elastic_release: "{{ lookup('env', 'ELASTIC_RELEASE') | int}}"
+    elasticstack_release: "{{ lookup('env', 'ELASTIC_RELEASE') | int}}"
     elasticsearch_node_types:
       - master
       - data