how can I use "@timestamp" field with an alert action token?

[okug]

I have "@timestamp" field in search results. I'd like to use the value in my alert message for slack.
So, I tried to use it like

$result.@timestamp$, $result.message$

But, @timestamp value won't appear in the alert message. What do I do wrong?

Thanks,
Hiroshi

[Vijeta]

Try to rename it to eliminate the @ character before using in token. Something like rename "@timestamp" as timestamp