Timestamp format change


I have a field called timestamp_event in my index.. Currently it is in the format
eg : 2017-11-14T02:38:48.301Z.

I want to reindex and change the format to 14-Nov-2017 0:00:00 .

How can we do it? can any one help?

May I ask why you want to do that?

Do you mean that the source document has a different format or is it for displaying reason ?

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