Logstash 6.4.2 with modules netflow can't import date to es

Elastic Stack Logstash
1

logstash 6.4.2 with modules netflow can't import date to es.
my logstash.yml file is

modules:
  - name: netflow
    var.input.udp.port: 9996
    var.elasticsearch.hosts: "11.11.xxx:9900,11.11.xx:9900,11.11.xx:9900,11.xxx:9900,11.11.xxx:9900,11.xx:9900"
    var.kibana.host: "11.xx.xxx.xxx:6601"
    var.elasticsearch.ssl.enabled: false
    var.kibana.ssl.enabled: false

i can't see any data in es why ?
can give a example netflow data to me with logstash can into es test the logstash work wirth or not?

2

it user the ascii or other data?