This article is applicable to Veritas Enterprise Vault 14.2 and later.
For information about moving indexes on Veritas Enterprise Vault versions earlier than 14.2, refer to the following article:
How to move the Index location to a different location on the same server
There may be an instance where indexes will need to be moved to a different location on the same server.

How to move the Index location to a different location on the same server in Enterprise Vault 14.2 and later
JIRA: EV-2470