How to filter "unknown" fields

Elastic Stack Kibana
1

I use ELK 5.0.1 + Filebeat 5.0.1.

I configure Filebeat to send json logs to Elasticsearch.
When I visualize the logs in Kibana, I have a lot of "unknown" field.
I want to filter some of this field like I can do with the "message" field.

How can I do this ?

http://img4.hostingpics.net/pics/696715unknownfields.png

2

You probably need to refresh Kibana's mapping cache. This doc page describes the process a bit

3

That solve my issue.
Thanks.