enable security manager in tests

Author: rmuir

pom.xml

@@ -33,8 +33,6 @@
 
  <properties>
  <amazonaws.version>1.9.34</amazonaws.version>
- <!-- see https://github.com/elastic/elasticsearch-cloud-aws/issues/210 -->
- <tests.security.manager>false</tests.security.manager>
  </properties>
 
  <dependencies>