Convert string type(coming from spark structured streaming) to datetime(2019-01-02 17:16:04) in Elastic search and apply aggregation

Elastic Stack Elasticsearch
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Hi,
I am using spark structured streaming and save my data to ES and want to create dashboard from Kibana.
In spark , I have order data and I have created_at field in spark, which is String type.
I need to convert it into datetime.
But in spark when I am doing this, I got converted into some long value in Elastic search for that date.
check this :- https://github.com/elastic/elasticsearch-hadoop/issues/1173

So , My problem is How to convert string (created_at) to date(created_at) in Elastic search and apply aggreagations.

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