Inquiries about warning fields

[inwoo1]

As you can see, I am going to set up an Alert, and I
The field name you set is not visible.
Fields starting with iso. are not visible, and fields starting with the changed forti_ are not visible.
How can I make this field name selectable in Alert settings?

  mutate { 
    rename => { 
        "iso.org.dod.internet.private.enterprises.12356.101.4.1.22.0" => "forti_fw_uptime" 
        "iso.org.dod.internet.private.enterprises.12356.101.4.1.3.0" => "forti_fw_use_cpu" 
        "iso.org.dod.internet.private.enterprises.12356.101.4.1.4.0" => "forti_fw_use_memory" 
        "iso.org.dod.internet.private.enterprises.12356.101.4.1.8.0" => "forti_fw_sessioncount" 
    } 
  }