anchor.diff:  
   The `host` parameter must contain a scheme, host, and port (e.g.
   `https://otherhost:9200`). The `username` and `password` parameters are
  -optional and when they are present reindex will connect to the remote
  +optional, and when they are present `_reindex` will connect to the remote
   Elasticsearch node using basic auth. Be sure to use `https` when using
   basic auth or the password will be sent in plain text.
   
  
positive.code: wait_time = target_time - write_time = 2 seconds - .5 seconds = 1.5 seconds
  --------------------------------------------------
  
  Since the batch is issued as a single `_bulk` request large batch sizes will
  cause Elasticsearch to create many requests and then wait for a while before
  starting the next set. This is "bursty" instead of "smooth". The default is `-1`.
  
  [float]
  [[docs-reindex-response-body]]
  
negative.code: --------------------------------------------------
  // CONSOLE
  
  The `task_id` can be found using the Tasks API.
  
  Cancelation should happen quickly but might take a few seconds. The Tasks
  API will continue to list the task until it wakes to cancel itself.
  
  
  [float]
  