How to concatenate time fields and generate new timestamp

Hi,

I am new to elk, can someone help me in adding new timestamp by concatenating multiple time fields.

Expected Output :
Time totalfiles totalclean notscanned mailid deleted cleaned
Dec 25, 2019 @ 15:42:23.815 333 444 aa@c.com 666 555

Current output:
Time totalfiles totalclean notscanned mailid deleted cleaned
Dec 25, 2019 @ 15:42:23.815 - - - - - 555
Dec 25, 2019 @ 15:42:23.815 - - - - 666 -
Dec 25, 2019 @ 15:42:23.814 - 222 - - - -
Dec 25, 2019 @ 15:42:23.814 333 - - - - -
Dec 25, 2019 @ 15:42:23.814 - - 444 - - -
Dec 25, 2019 @ 15:42:23.813 - - - - - -
Dec 25, 2019 @ 15:42:23.813 - - - Initiator Name: req1@hpe.com - -
Dec 25, 2019 @ 15:42:23.813 111 - - - - -
Dec 25, 2019 @ 15:42:23.812 - - - - - 555
Dec 25, 2019 @ 15:42:23.812 - - - - 666 -

My grok:

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