anchor.diff:  Elasticsearch can reclaim the space it uses.
   
   `wait_for_active_shards` controls how many copies of a shard must be active
  -before proceeding with the reindexing. See <<index-wait-for-active-shards,here>> 
  +before proceeding with the reindexing. See <<index-wait-for-active-shards,here>>
   for details. `timeout` controls how long each write request waits for unavailable
   shards to become available. Both work exactly how they work in the
   <<docs-bulk,Bulk API>>.
  
positive.code: // TESTRESPONSE
  
  Or you can search by `tag` or whatever you want.
  
negative.code: timeouts.
  
  [float]
  [[docs-reindex-change-name]]
  === Reindex to change the name of a field
  
  `_reindex` can be used to build a copy of an index with renamed fields. Say you
  