void setDistributedSystem(AdminDistributedSystemImpl system) {
    this.system = system;
  }
Marks this config object as "read only". Attempts to modify a config object will result in a
{@link IllegalStateException} being thrown.

@since GemFire 4.0
geode-core/src/main/java/org/apache/geode/admin/internal/DistributedSystemConfigImpl.java