anchor.diff:  was a pull request some time ago. But that's not documented yet.
   ////
   
  -Inserts the transaction in a Redis list. This output plugin is compatibile with
  +Inserts the events in a Redis list. This output plugin is compatibile with
   http://logstash.net/docs/1.4.2/inputs/redis[Redis input plugin] from Logstash,
   so Redis can be used as queue between the Beat shippers and Logstash.
   
  
positive.code: [[configuration-output]]
  === Outputs
  
  Starting with Beat version 0.3.0, multiple outputs can be configured for
  exporting the correlated transactions. Currently the following output types are
  supported:
  
  * Elasticsearch
  * Lumberjack (Logstash)
  
negative.code: 
  The index root name where to write events to. The default is `packetbeat` and
  generates `[packetbeat-]YYYY.MM.DD` indexes (e.g. `packetbeat-2015.04.26`).
  
  The index root name where to write events to. The default is the beat its name.
  For example `packetbeat` generates `[packetbeat-]YYYY.MM.DD` indexes (e.g. `packetbeat-2015.04.26`).
  
  
  ===== max_retries
  
  