Inconsistent date fields returned

I have an index which has 3 fields of "date" type, @timestamp, startTime and endTime with built-in format (default strict_date_optional_time || epoch_millis). Run a query, elastic search (7.6.1) return iso8601 String for @timestamp while epoch milliseconds for startTime and endTime. Is there a way to make elastic search to return the same format of the date type?

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