anchor.diff:  * `discovery.seed_hosts`
   * `cluster.initial_master_nodes`
   
  -[NOTE]
  -==================================================
  -
  -[[modules-discovery-bootstrap-cluster-joining]] If you start an {es} node
  +[[modules-discovery-bootstrap-cluster-joining]]
  +.Forming a single cluster
  +****
  +If you start an {es} node
   without configuring these settings then it will start up in development mode and
   auto-bootstrap itself into a new cluster. If you start some {es} nodes on
   different hosts then by default they will not discover each other and will form
  
positive.code: * Configure `cluster.initial_master_nodes` as described above.
  * Restart all the nodes and verify that they have formed a single cluster.
  
  ==================================================
  
negative.code: default value for the cluster name is `elasticsearch`, but it is recommended to
  change this to reflect the logical name of the cluster.
  
  [[bootstrap-auto-bootstrap]]
  ==== Auto-bootstrapping in development mode
  
  If the cluster is running with a completely default configuration then it will
  