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- Backported the Event get/set API. These changes enable Logstash 2.4 to install plugins that use the 5.0 API (Issue 5449).
- Added support for writing Logstash’s logs in JSON format. You can use the command-line flag
--log-in-jsonto specify that Logstash write its own logs in JSON (Issue 1569).
- Plugin Generator: Added a subcommand
bin/logstash-plugin. This bootstraps a new plugin with the correct directory structure and all the required files (templates).
- Beats input has been reimplemented using Netty, an asynchronous IO framework for Java. This rewrite for performance brings the plugin in line with the Logstash Forwarder + LS combination (Issue 92).