Typically, a corrupt index regenerates itself. If the system does not start the regeneration process, you must issue a script command to delete the existing index and regenerate it.

1. Navigate to System Definition > Scripts - Background.
2. In Run Script box, type the syntax for the background script:
   To regenerate the task text index, the following could be used as a background script:

   var indexer = new GlideLuceneTextIndexEvent();
      indexer.createIndex("task", "my_email@service-now.com");
   

   Change the email address to the address that receives the notification when the index is completed. The script creates an event that the index handler processes so the script completes almost instantly.

3. Click the Run script button.
4. When the scheduled job picks up the event, you can check the Component Status page and see that the index is being generated. An entry also appears in the log, as shown in the following example:

    10/28/09 15:36:19 (521) worker.1 worker.1 TextIndexGenerator: Text index generation starting for: task
   

 10/28/09 15:37:13 (213) worker.1 worker.1 [0:00:01.462] TextIndex generation complete for: problem, rows indexed: 11

  10/28/09 15:37:20 (794) worker.1 worker.1 TextIndexGenerator: Text index generation complete for: task, in: 0:01:02.669