Found a small issue with the v11 admin docs, on page 160 and 161 it talks about removing the SIS for a user then re-adding, the problem is that they forgot to include how to add the SIS URL, so here is the mod:
Disabling Indexing
If needed you can disable indexing on a per-user basis, but if you do, that user’s search
function does not work.
To disable indexing:
1 On the command line, run the following
ommodu -o <user_name> --index none
2 If you later re-enable indexing for the user, you must run these commands to
index messages.
ommodu -o <user_name> --index auto
sxmkindex <user-name>