- https://www.elastic.co/guide/en/elastic-stack/current/elastic-stack.html
- https://www.elastic.co/guide/en/elasticsearch/reference/current/_basic_concepts.html
- https://www.elastic.co/guide/en/logstash/6.1/pipeline.html
- https://www.elastic.co/guide/en/kibana/6.x/introduction.html
- http://www.rsyslog.com/doc/v8-stable/configuration/modules/omelasticsearch.html
- https://raw.githubusercontent.com/markuskont/salt-elasticsearch/master/tests/json2ela.py
- https://github.com/markuskont/salt-elasticsearch/blob/master/tests/shipper.js
- https://elasticsearch-py.readthedocs.io/en/master/
- https://github.com/elastic/elasticsearch-js
- https://github.com/olivere/elastic
- python example