ADManager API SearchUser criteria

ADManager API SearchUser criteria

Hi. It looks like Search user API can search only by SamAccountName field. Whatever i write in searchText parameter but login the response is empty. For example, next request should find user with email user@domain.com but it doesn't. And with &searchText=user it finds a user. Is it a bug or a feature? I need to find users by phone so much!

http://Byron:8080/RestAPI/SearchUser?domainName=admanagerplus.com&AuthToken=a70d9e6c-4167-4de4-a6a1-3b3aff50c82e&range=200&startIndex=1&searchText=user@domain.com