<https://ulyaoth.com/tips-tricks/output-to-elasticsearch-with-rsyslog-in-logstash-format/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ulyaoth.com/tips-tricks/output-to-elasticsearch-with-rsyslog-in-logstash-format/>