anchor.diff:  [float]
   ==== Using the file-based discovery plugin
   
  -The file-based discovery plugin provides the ability to specify the 
  +The file-based discovery plugin provides the ability to specify the
   unicast hosts list through a simple `unicast_hosts.txt` file that can
   be dynamically updated at any time. To enable, add the following in `elasticsearch.yml`:
   
  
positive.code: [2001:0db8:85a3:0000:0000:8a2e:0370:7334]:9301
  ----------------------------------------------------------------
  
  Host names are allowed instead of IP addresses (similar to 
  `discovery.zen.ping.unicast.hosts`), and IPv6 addresses must be
  specified in brackets with the port coming after the brackets. 
  
negative.code: ----
  
  This plugin simply provides a facility to supply the unicast hosts list for
  zen discovery through an external file that can be updated at any time by a side process.
  
  For example, this gives a convenient mechanism for an Elasticsearch instance
  that is  run in docker containers to be dynamically supplied a list of IP
  addresses to connect to for zen discovery when those IP addresses may not be
  known at node startup.
  
  Note that the file-based discovery plugin is meant to augment the unicast
  hosts list in `elasticsearch.yml` (if specified), not replace it.  Therefore,
  