How to subtract TimeSpan in ticks from datetime in any type of query range or script

I want to achive something like this endDateUtc.Subtract(timespan) <= DateTime.Now in elastic query . both fields ( enddateutc and timespan ) available in document. i want to do something like doc["enddateutc"].value - doc["timespan"].value <= , but since timespan is in ticks. i am not able to subtract. Appreciate any help

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