Add New field by Comparing Date

I am using Kibana v7.17 where I am trying to create new calculated field by comparing the date present in the existing field with hardcoded date.
For e.g. if(doc['trans_date'].value >= "2021-02-15" {emit("FY 2021"}

But here getting error that cannot compare Date with string. How to convert "2021-02-15" to Date type?

Check this page:

This code snippet worked for me:

String datetime = '2021-02-15T00:00:00Z';
ZonedDateTime zdt = ZonedDateTime.parse(datetime);

ZonedDateTime zdtTo = doc['timestamp'].value;

if ( zdt.isAfter(zdtTo)){
} else {

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