User Advanced Search by email without quotes does not return results the same way as searching by the other fields

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.30 EE GA3, 6.2.0 CE M3, 6.2.0 CE M6
• Fix Version/s: 6.1.30 EE GA3, 6.2.0 CE M6
• Component/s: Search Infrastructure, Search Infrastructure > Framework
• Labels: None
• Environment: Tomcat 7.0.27 + MySQL 5. Portal 6.1.x EE GIT ID: 2a9e6c47c5a7bc6fc7f19ecedac92554c268fa45.; Tomcat 7.0.27 + MySQL 5. Portal 6.2.x GIT ID: 49b3c7d56ab710eedbc5677e1067247fcd33eacd.
• Branch Version/s:
  6.1.x
• Backported to Branch:
  Committed
• Epic/Theme:
  • Platform
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/11373

Steps to reproduce:

1. Add a user with email address "[e-mail]"
2. Click "Search All Users" and navigate to the Advanced Search for users
3. Enter "[e-mail]" into the email field.
4. Click "Search"
   • The default admin user (email is [e-mail]) and the created user (email is [e-mail]) will show up.
   • Entering "user1" into the search field will cause only the created user to show up.
   • Entering "liferay.com" into the search field will cause both users to show up.

I've also reindexed and this does not change the results.

Searching by first name, middle name, etc does not produce the same effect if there are multiple users with similar names (e.g. user1, user2, user3)