anchor.diff:  [source,shell]
   --------------------------------------------------
   % curl localhost:9200/_cat/indices | grep ^yell
  -yellow foo          5 1   4 0    17kb    17kb
  +yellow wiki     2 1  6401 1115 151.4mb 151.4mb
  +yellow twitter  5 1 11434    0    32mb    32mb
   --------------------------------------------------
   
   What's my largest index by disk usage not including replicas?
  
positive.code: [source,shell]
  --------------------------------------------------
  % curl 'localhost:9200/_cat/indices/twi*?v'
  health index    pri rep docs docs/del size/pri size/total
  green  twitter    2   0  627        7      2mb        2mb
  green  twitter2   2   0  628        0    2.5mb      2.5mb
  --------------------------------------------------
  
  We can tell quickly how many shards make up an index, the number of
  docs, deleted docs, primary store size, and total store size (all
  shards including replicas).
  
  [float]
  [[examples]]
  
negative.code: [source,shell]
  --------------------------------------------------
  % curl 'localhost:9200/_cat/indices?bytes=b' | sort -rnk7
  green wiki     2 0  6401 1115 158843725 158843725
  green twitter  5 1 11434    0  67155614  33577857
  green twitter2 2 0  2030    0   6125085   6125085
  --------------------------------------------------
  
  How many merge operations have the shards for the `wiki` completed?
  
  [source,shell]
  --------------------------------------------------
  % curl 'localhost:9200/_cat/indices/wiki?pri&v&h=health,index,prirep,docs.count,mt'
  health index docs.count mt pri.mt
  green  wiki        9646 16     16
  --------------------------------------------------
  