Fix elasticstack_release lookup (#324)

Fix lookup for elasticstack_release in molecule scenario

Author: tbauriedel

molecule/elasticsearch_test_modules/converge.yml

@@ -9,8 +9,7 @@
     elasticstack_full_stack: false
     elasticsearch_jna_workaround: true
     elasticsearch_disable_systemcallfilterchecks: true
-    #elasticstack_release: "{{ lookup('env', 'ELASTIC_RELEASE') | int}}"
-    elasticstack_release: 8
+    elasticstack_release: "{{ lookup('env', 'ELASTIC_RELEASE') | int}}"
     elasticsearch_heap: "1"
     elasticstack_no_log: false
   tasks: