Filebeat fields missing

When I installed filebeat in a linux server I enabled nginx module. In Discover, I can see all the nginx fields but they are ALL empty. My configuration is as follows:
input {
beats:...
}
filter {
...
}
output {
elasticsearch ....
}
Any help will be greatly appreciated.

It seems like adding the filter in logstash solved the problem. Use Logstash pipelines for parsing | Logstash Reference [7.11] | Elastic

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