How to update the default datatype of the field from text to date?

I am using AWS IoT CORE and transferring the data to Elastics search service. Then i am creating the Index pattern in the Kibana.
My IoT device gives the date in standard UTC format "2018-07-01 01:01:01:44567" OR "YYYY-MM-DD HH:mm:ss:SSS"

field : "event_ts7" by default is loaded as string. Can you please help me with updating the default data type to date from string ?? I Need the field to be date.

Elastic Search image :

Kibana Index pattern image :

Also I can see duplicate fields in the index patter with the .Keyword .
How to remove the .keyword field.

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