REST API search (rest/api/2/user/picker?query="ab@domain.com") for users using email address is returning inaccurate results

Issue Summary

REST API search (rest/api/2/user/picker?query="ab@domain.com") for users using email address is returning inaccurate results

Steps to Reproduce

1. Create multiple users with email addresses like abc@domain.com, abcd@domain.com
2. Now, using REST APIC query for users having email address ab@domain.com
3. example: rest/api/2/user/picker?query="ab@domain.com"

Expected Results

1. This should return no users

Actual Results

1. but it's returning 2 users above i.e abc@domain.com, abcd@domain.com which do not have an exact email address but it's searching for matches in the first part excluding domain.com

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available