Official documentation of Logstash: https://www.elastic.co/guide/en/logstash/1.5/index.html

Generating Twitter developer account tokens: https://dev.twitter.com/oauth/overview/application-owner-access-tokens

Twitter input plugin—Logstash: https://www.elastic.co/guide/en/logstash/1.5/plugins-inputs-twitter.html

Input plugins—Logstash: https://www.elastic.co/guide/en/logstash/1.5/input-plugins.html

Filter plugins—Logstash: https://www.elastic.co/guide/en/logstash/1.5/filter-plugins.html

Output plugins—Logstash: https://www.elastic.co/guide/en/logstash/1.5/output-plugins.html

Deprecating Rivers: https://www.elastic.co/blog/deprecating-rivers