anchor.diff:  
   experimental[]
   
  -The field stats api allows one to find statistical properties of a field without executing a search, but
  -looking up measurements that are natively available in the Lucene index. This can be useful to explore a dataset which
  -you don't know much about. For example, this allows creating a histogram aggregation with meaningful intervals.
  -
  -The field stats api by defaults executes on all indices, but can execute on specific indices too.
  +The field stats api allows one to find statistical properties of a field
  +without executing a search, but looking up measurements that are natively
  +available in the Lucene index. This can be useful to explore a dataset which
  +you don't know much about. For example, this allows creating a histogram
  +aggregation with meaningful intervals based on the min/max range of values.
  +
  +The field stats api by defaults executes on all indices, but can execute on
  +specific indices too.
   
   All indices:
   
  
positive.code: }
  --------------------------------------------------
  
  <1> The `stack` key means it contains all field stats for the `stack` index.
negative.code: --------------------------------------------------
  
  <1> The `_all` key indicates that it contains the field stats of all indices in the cluster.
  ==================================================
  
  .Indices level field statistics
  ==================================================
  
  [source,js]
  --------------------------------------------------
  GET /_field_stats?fields=rating,answer_count,creation_date,display_name&level=indices
  --------------------------------------------------
  
  [source,js]
  