After adding below configuration to logstash.yml for Netflow module, Logstash stops listen ports for files from conf.d directory.
modules:
- name: netflow
var.elasticsearch.hosts: "localhost:9200"
var.input.udp.port: 2055
var.kibana.host: "localhost:5601"
In logs i can see below message:
[2019-04-22T04:51:45,804][WARN ][logstash.config.source.multilocal] Ignoring the 'pipelines.yml' file because modules or command line options are specified