I'm trying to do this search "sourcetype="MySQL" | multikv fields Variable_name Value | search Variable_name="Innodb_data_pending_reads", through the web it works fine, but with the CLI I can't do it.
There are several output commands, I would suggest outputcsv.
You may also opt for just using fields.
I am not clear where you want the fields to go, to a file or to stdout.