Ingest node date processor can't save filed type as 'date'

Elastic Stack Elasticsearch
1

Hi ,I'm using ES5.4. I'm trying to use Ingest node date processor parse a file and save to another，the source filed type is keyword and the target filed type also keyword，why it not date type？

2

Most likely because you did not define it as a date field in the mapping?

3

I use grok processor before the date processor. I think grok processor auto generate the mapping

4

No. Ingest does not generate any mapping.

5

Thanks，that must be filebeat difine the mapping. I will look into it