anchor.diff:  curl localhost:9200/my_index/_stats/indexing
   # Indexing stats for my_index for my_type1 and my_type2
   curl localhost:9200/my_index/_stats/indexing/my_type1,my_type2
  +# Search stats for group1 and group2
  +curl 'localhost:9200/_stats/search/group1,group2
   --------------------------------------------------
  
positive.code: 
  `get`:: 		Get statistics, including missing stats.
  
  `search`:: 		Search statistics, including custom grouping using the
  				`groups` parameter (search operations can be associated with one or more
  				groups).
  
  `warmer`:: 		Warmer statistics.
  `merge`:: 		Merge statistics.
  
negative.code: curl 'localhost:9200/_stats?clear=true&flush=true'
  # Get back stats for type1 and type2 documents for the my_index index
  curl 'localhost:9200/my_index/_stats?clear=true&indexing=true&types=type1,type2
  # Get back just search stats for group1 and group2
  curl 'localhost:9200/_stats?clear=true&search=true&groups=group1,group2
  --------------------------------------------------
  
  The stats returned are aggregated on the index level, with
  