Disable security manager when running with `mvn exec:exec`

pom.xml

@@ -438,7 +438,6 @@
             <version>1.4.0</version>
             <executions>
               <execution>
-                <phase>exec</phase>
                 <goals>
                   <goal>exec</goal>
                 </goals>
@@ -447,6 +446,7 @@
             <configuration>
               <executable>${jvm.executable}</executable>
               <arguments>
+                <argument>-Des.security.manager.enabled=false</argument>
                 <argument>-classpath</argument>
                 <classpath/>
                 <argument>org.elasticsearch.bootstrap.Bootstrap</argument>