Full Text Index failed with error: "Worker thread threw an exception" (4257283)

.P.0: Worker thread threw an exception

System.IO.IOException: read past EOF

For example:

P11.P.0: Worker thread threw an exception

System.IO.IOException: read past EOF

   at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, Boolean closeDir, IndexDeletionPolicy deletionPolicy, Boolean autoCommit, nt32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)

   at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a, Boolean create, MaxFieldLength mfl)

   at Quest.ArchiveManager.FullTextIndex.Indexer2.OpenOrCreateIndex()

   at Quest.ArchiveManager.FullTextIndex.Indexer2.ProducerProc(Object context)

   at Quest.ArchiveManager.FullTextIndex.WorkerThread.ThreadProc(Object state)

Log Name:      Archive Manager

Source:        Full Text Index Service

Date:          6/30/2015 7:15:40 AM

Event ID:      1

Task Category: None

Level:         Error

Keywords:      Classic

User:          N/A

Computer:      Archivemanagerservername.domain.com

Description:

The description for Event ID 1 from source Full Text Index Service cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event: 

2015-06-30 07:15:40,544 [WT.P9.P.0] ERROR WThread - {{d3ff9f68-782c-4d82-9bc9-c10f483bbad8}} Worker thread threw an exception

Lucene.Net.Index.CorruptIndexException: checksum mismatch in segments file

   at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, Boolean closeDir, IndexDeletionPolicy deletionPolicy, Boolean autoCommit, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)

   at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a, Boolean create, MaxFieldLength mfl)

   at Dell.AM.FullTextIndex.Indexer2.OpenOrCreateIndex()

   at Dell.AM.FullTextIndex.Indexer2.ProducerProc(Object context)

   at Dell.AM.FullTextIndex.WorkerThread.ThreadProc(Object state)

    1

    2

    0

    0x80000000000000

    34591550

    Archive Manager

    Archivemanagerservername.domain.com

    2015-06-30 07:15:40,544 [WT.P9.P.0] ERROR WThread - {{d3ff9f68-782c-4d82-9bc9-c10f483bbad8}} Worker thread threw an exception

Lucene.Net.Index.CorruptIndexException: checksum mismatch in segments file

   at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, Boolean closeDir, IndexDeletionPolicy deletionPolicy, Boolean autoCommit, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)

   at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a, Boolean create, MaxFieldLength mfl)

   at Dell.AM.FullTextIndex.Indexer2.OpenOrCreateIndex()

   at Dell.AM.FullTextIndex.Indexer2.ProducerProc(Object context)

   at Dell.AM.FullTextIndex.WorkerThread.ThreadProc(Object state)

Perform a repair on the Index.

1. On the Archive Manager website, go to Index Dashboard
2. Click on the Message Index tab then click on the Request Operation tab at the bottom
3. Choose Repair option, with Now checked and click Submit
4. Perform step 2 and 3 for Attachment Index
5. Wait for a while and click the Work-in-Progress Index to see the progress of the repair