anchor.diff:  * The <<search-request-from-size,`size` parameter>> controls the number of
     results *per shard*, not per request, so a `size` of `10` which hits 5
     shards will return a maximum of 50 results per `scroll` request.
  +
  +If you want the scoring to happen, even without sorting on it, set the
  +`track_scores` parameter to `true`.
   
   [[scroll-search-context]]
   ==== Keeping the search context alive
  
positive.code: A scanning scroll request differs from a standard scroll request in four
  ways:
  
  * Sorting is disabled. Results are returned in the order they appear in the index.
  
  * Aggregations are not supported.
  
  
negative.code: 
  Normally, you just want to retrieve all results and the order doesn't matter.
  Scrolling can be combined with the <<scan,`scan`>> search type to disable
  any scoring or sorting and to return results in the most efficient way
  possible.  All that is needed is to add `search_type=scan` to the query string
  of the initial search request:
  
  [source,js]
  --------------------------------------------------
  