text: The index data must be migrated only after users no longer need to access the data. If a user 
  must access data in the migrated tables, the process of importing the data into the database 
  requires administrator intervention, and usually results in a significant delay in completing the 
  query. Additional space is required in the database and temporary storage areas to import the 
  data. 
  
  To enable the migration of index data, you must define a storage set that identifies a storage 
  node that is maintained by ASM and update the System Migration application group to use 
  the storage set. 
  
  **10.3.2 Expiring data and indexes**
  
  In all four of the storage and expiration scenarios, the index data is stored in the Content 
  Manager OnDemand database in application group data tables. Typically, these indexes are 
  expired when the document data is expired from the system. 
  
  **Life of Data and Indexes field**
  This field determines when Content Manager OnDemand deletes documents, resources, and 
  index data from the application group. 