If number of users are more than 20 then it shows only 20 users list. for other user it shows as not present.
Steps to reproduce:
1. Create more than 20 users in Ambari
2. Go to File views and start typing the random username under 'Grant permission to these users' - for some it show red mark when try to save it.
UI is making REST API call to load only 20 users
so Ambari is returning 20 users and rest of them will not shown in views grant page.