title: Keycloak ID token doesnt contain "group" information
body: <p>I am using a javax filter which gets a HttpRequest from keycloak server if the user has successfully authenticated. 
  From the request I was able to get the Id token and on decoding this <code>group</code> name is missing from the id token.</p>
  
  <p>How to map the group name information in id token ?  </p>