How to display a latest string value in Kibana metric visualize widget?

need vizualize the JSON:

{
"last_send_date": "2019-07-10 12:58:00.0",
"waiting_qty": 0,
"verifying_qty": 0,
}

"last_send_date" in metric or table widget. Or my field was not listed in fields dropdown list.

Solution for Top Hit work with number only.
How to display a latest string value in Kibana metric visualize widget?
Or how to convert string to date or number by filter? Or what?

Thanks!

Sorry. Updating Kibana index cache (Kibana's Management > Index Patterns app and click the refresh button) was resolved my problem

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