Email is a unique identification mechanism for user, and we use email as user name as well. when we search by email address (/identity/api/v1/user?search=email=XXX), we are supposed to get a response for exact matches of email (As like search by UUID) .
[At the moment search by email is a pattern matching search, and it responds all profiles whose email starts by search email. Issue with current search is, when we search for a user, it may respond with someone else profile]