Separate Index in 9.0.3

Scenario:

EV server archives mailboxes.

We are planning on adding Journal task as well.

Can I separate the indexes of the journal from the indexes of the mailbox archiving?

As There is going to be a new vault store group & new vault store for the journal, we would like to separate the indexes as well.

is ip possible in version 9.0.3?

thanks,

Sarah