[xwiki-users] How to configure search behavior in xwiki?

I have configured to use Lucene search in my xwiki application. Right now in xwiki , any user is able to search any other user details by entering his deatils in serach text box.I want to configure it in a way user should be able to search the other users who belongs to same group otherwise it should not other group user details. Is it configurable in xwiki or i need to make some changes in code for the same.Thanks.