Issue Summary

You can search for users in user picker fields using either the Display name or Email address as criteria.

That's currently not working in User picker (Multiple users) fields.

Steps to Reproduce

• Create a User picket (multiple users) field
  
• Add it to a screen
• Try to search for a user using its email address

Expected Results

Jira will return results that match based on email address.

Actual Results

No results are found. Results are only matched agains the display name.

Workaround

Use the display name as search criteria.