anchor.diff:  are distributed proportionally to each sub-request. Combine that with the point
   above about distribution being uneven and you should conclude that the using
   `size` with `slices` might not result in exactly `size` documents being
  -`_update_by_query`ed.
  -* Each sub-requests gets a slightly different snapshot of the source index
  +updated.
  +* Each sub-request gets a slightly different snapshot of the source index
   though these are all taken at approximately the same time.
   
   [float]
  
positive.code: 
  `retries`::
  
  The number of retries attempted by update-by-query. `bulk` is the number of bulk
  actions retried and `search` is the number of search actions retried.
  
  `throttled_millis`::
  
  
negative.code: --------------------------------------------------
  // TESTRESPONSE[s/"took" : 147/"took" : "$body.took"/]
  
  [horizontal]
  `took`::
  
  The number of milliseconds from start to end of the whole operation.
  