Inconsistent index in portal

Symptoms:

• Index is inactive in 'Indexing Monitor'.
• Index is not visible in 'Index Administration'.
• Not able to create index in same name which was deleted earlier.
• Error during search occured: com.sapportals.wcm.WcmException: com.sapportals.trex.TrexException: Index does not exist; index=<index name>(Errorcode 2007)

Environment:

TREX 7.0/7.1

Cause:

Index is directly deleted on standalone TREX admin tool.

Solution:

Create index in Standalone TREX Admin Tool.

Go to Standalone TREX Admin Tool -> Index: Landscape -> Right click on page content area -> Choose 'Create Index' -> Use Same Index ID as earlier -> Put '1' in queue server field -> Click on 'Execute'  -> after this run 'Reindex' from portal