anchor.diff:  Bulk requests only take up one slot on each shard that they touch no matter how
   many times they modify the shard.
   
  +[float]
   === Examples
   
   These will create a document and immediately refresh the index so it is visible:
  
positive.code: general, if you have a running system you don't wish to disturb then
  `refresh=wait_for` is a smaller modification.
  
  === `refresh=wait_for` Can Force a Refresh
  
  If a `refresh=wait_for` request comes in when there are already
  
negative.code: Take no refresh related actions. The changes made by this request will be made
  visible at some point after the request returns.
  
  [float]
  === Choosing which setting to use
  
  Unless you have a good reason to wait for the change to become visible always
  