Critical Error when trying to enable postmeta

I was trying to add keys thru the GUI in the wordpress but it keeps timeout due to the number of posts, so I try to enable it from the cPanel terminal with the command wp index-mysql enable G03_postmeta but it shows critical error. I suspect this is because of the previous run I did from the plugins GUI add keys button (but failed)

How to recover from this? I hope I don’t have to restore from backup for this because some new contents had gone into the site, and I hope there is another solution other than restoring from backups.

The output from the command recommend to alter the table, but I don’t quite understand how to do it and I think the output from the command is not a complete statement, maybe it’s too long that why it’s only showing partial.