Missing data in log - Source field is always Null


I'm using ELK stack in docker swarm with 6 filebeat, 1 logstash, 1 elasticsearch and 1 kibana.
All is in version 7.6.1.

I have a problem when receiving data (cf the photo below)

All logs are sending with empty data.
I have setup logstash with stdout rubydebug and I see all logs parsed with data

Here my monitoring stack:

I had this problem yesterday and delete all index to get logs with data but today it started again and delete index doesnt work and I think it's not the problem.

Feel free to ask me more information like config, params, etc


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