Servers can be configured as part of a server group, so that configuration changes that are applied to a single server, are then applied to all servers in a group. When managing a server that is a member of a server group, creating or updating objects using the Configuration API requires the applyChangeTo query attribute. The behavior and acceptable values for this parameter are identical to the dsconfig parameter of the same name. A value of single-server or server-group can be specified. For example: 
http://localhost:8082/config/backends/userRoot?applyChangeTo=single-server