anchor.diff:  Instead, the config file must be named `elasticsearch.yml` and must be located
   in the default `config/` directory, or in the directory specified in the
   `CONF_DIR` environment variable.
  +
  +==== `ES_CLASSPATH removed`
  +
  +The `ES_CLASSPATH` environment variable is no longer used to set the class
  +path. External libraries should preferably be loaded using the plugin
  +mechanism or, if you really must, be copied to the `lib/` directory.
  
positive.code: ==== Command line flags
  
  Command line flags using single dash notation must be now specified as the first arguments.
  For example if previously using: 
  
  [source,sh]
  ---------------
  
negative.code: 
  [source,sh]
  ---------------
  ./elasticsearch -Des.path.conf=/opt/elasticsearch/conf/test_node --node.name=test_node
  ---------------
  
  for the flag to take effect.
  