public boolean isFlattenNestedGroups() {
        return flattenNestedGroups;
    }
Returns true if nested / complex / hierarchic groups should be should be flattened.
<p>
This means: if group A is member of group B, the members of group A will also be members of
group B
xmppserver/src/main/java/org/jivesoftware/openfire/ldap/LdapManager.java