Grafana7.1,timefield can't setting type in Elasticsearch

Grafana Elasticsearch
1

hi,in grafana6, I can setting date type of timefield ,such as YYYY:MM:DD or YYYY:MM:DD hh:mm:s
but I can’t find this feature in grafana 7.1，please tell me how to do

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2

Use the override on the top right

3

i try to use unit,but it can’t work,please guide me how to do,thx~

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