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: [[discovery-file]]
  === File-Based Discovery Plugin
  
  The file-based discovery plugin uses a list of hosts/ports in a `unicast_hosts.txt` file 
  in the `config/discovery-file` directory for unicast discovery.
  
  [[discovery-file-install]]
  
negative.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.
  