Elasticsearch/Logstash/Kibana setup configured as a Netflow receiver
Based on https://github.com/spujadas/elk-docker
Listens on UDP $NETFLOW_PORT, which is 9995 by default.
Use http://manpages.ubuntu.com/manpages/precise/man8/softflowd.8.html or https://github.com/aabc/ipt-netflow to send data.