Non-exist comment appears in Blog search result list after reindex

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.X EE, 7.0.0 M3
• Fix Version/s: 6.2.2 CE GA3 , 6.2.X EE, 7.0.0 M1
• Component/s: Collaboration, Collaboration > Blogs
• Labels:
  • QA-R
  • liferay-fixpack-collaboration-9-6210
• Environment: Tomcat 7.0.42 + MySQL 5. Portal 6.2.x EE GIT ID: 6ca5ac506ed52369cf72b96267d3ecd58cab87ba. ; Tomcat 7.0.42 + MySQL 5. Portal master GIT ID: ccb4841475f421fcb5a4125d3ba7dc00a28f3829.
• Branch Version/s:
  6.2.x
• Backported to Branch:
  Committed
• Story Points: 5
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/15865

Steps for reproduce:

1. Add Blog portlet to page.
2. Add a new blog entry.
3. Go to Control Panel > Server Administration.
4. Execute "Reindex all search indexes".
5. Back to the page, click search button in Blog portlet.

Excepted result:
Blog portlet will display all the bolg entries.

Actual result:
Non-exist comment appears in Blog search result list.