anchor.diff:  [source,shell]
   --------------------------------------------------
   % curl localhost:9200/_cat/indices | grep ^yell
  -yellow wiki     2 1  6401 1115 151.4mb 151.4mb
  -yellow twitter  5 1 11434    0    32mb    32mb
  +yellow open  wiki     2 1  6401 1115 151.4mb 151.4mb
  +yellow open  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?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?
  
negative.code: [source,shell]
  --------------------------------------------------
  % curl 'localhost:9200/_cat/indices/twi*?v'
  health status index    pri rep docs.count docs.deleted store.size pri.store.size
  green  open   twitter    5   1      11434            0       64mb           32mb
  green  open   twitter2   2   0       2030            0      5.8mb          5.8mb
  --------------------------------------------------
  
  We can tell quickly how many shards make up an index, the number of
  