Create day-of-week and hour-of-day fields from date field during indexing

Our data contains a timestamp that is mapped to a date type and has format yyyy-MM-ddTHH:mm:ssZ (e.g. 2019-01-20T18:00:53Z).
We would like to change it to a multi-field containing different properties of the date - day of week and hour of day - so they can be searched directly without using a script at search time.
Is it possible to extract the day-of-week and hour-of-day during indexing? Can a script be used in the template mapping to create the day-of-week and hour-of-day fields?

Have a look at ingest node feature and the script processor.

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