Version 5.3.
Double unique definition removed.
@Indexed
afterSaveOrModify sets UserGroupCache as expired only for major changes of user objects.
Merge branch '5.3'

* 5.3:
  @Indexed
  Double unique definition removed.
  Version 5.3.
5.3.1-SNAPSHOT
Merge branch 'master' into multi-tenancy

* master:
  5.3.1-SNAPSHOT
  afterSaveOrModify sets UserGroupCache as expired only for major changes of user objects.
  @Indexed
  Double unique definition removed.
  Version 5.3.