there isnt much in the way of built-in CLI for EV 10 but this should help:

How to use Performance Monitor to monitor the Indexing processes

Troubleshooting and monitoring index tasks

How to determine how many index volumes are online/offline using the SQL database

How to determine which SQL tables to use for Indexing issues

Yeah, I have searched for any CLI command and found none. I have used HTTP commands in the past but for other functions such as deletion of archived items.

I may be out of luck on this one.

you can script the checks in SQL and have them run on a schedule or something like that

they added a lot of powershell commands in EV11 but still not what you're looking for.

Enterprise Vault 11.0 PowerShell cmdlet reference guide

That could be a possibility. We are not ready for EV 11 yet though.

Thanks for the replies.

I wish this product had a better CLI like NetBackup. I will keep wishing.

That's not a bad idea. Thanks.

Is the index status maintained anywhere other than the state.dat file each index?

i thought i saw it in one of the sql related articles i sent you

I see it in HOWTO56248. 

Thanks

Thanks all for replying.

I figured it out by modifying the Failed field in the EnterpriseVaultDirectory and IndexVolume table. I created a Maintenance schedule to priodically check the table and modify if it finds failures.