I need to transform String field with numbers in format (yyyyddmmHHMM) to a Date field

Elastic Stack Kibana
1

I have logs from a Jenkins application and I need this LastCommitDate to be really a date, but it is a String image

How can i transform it to a Date field?
I need to transform even the past logs, so it will propably be needed to reindex but how to do it?

2

You can change the mapping for that field to type date and give it a format that matches your date string.

You will need to reindex or reingest your data once your mapping has changed.

3

Could you please give me an example for this?