anchor.diff:  === Human readable output
   
   Statistics are returned in a format suitable for humans
  -(eg `"exists_time": "1h"` or `"size": "1kb"`) and for computers
  -(eg `"exists_time_in_millis": 3600000` or `"size_in_bytes": 1024`).
  +(e.g. `"exists_time": "1h"` or `"size": "1kb"`) and for computers
  +(e.g. `"exists_time_in_millis": 3600000` or `"size_in_bytes": 1024`).
   The human readable values can be turned off by adding `?human=false`
   to the query string. This makes sense when the stats results are
   being consumed by a monitoring tool, rather than intended for human
  
positive.code: 
  Most APIs that refer to an `index` parameter support execution across multiple indices,
  using simple `test1,test2,test3` notation (or `_all` for all indices). It also
  support wildcards, for example: `test*` or `*test` or `te*t` or `*test*`, and the
  ability to "exclude" (`-`), for example: `test*,-test3`.
  
  All multi indices API support the following url query string parameters:
  
  `ignore_unavailable`::
  
  Controls whether to ignore if any specified indices are unavailable, this
  includes indices that don't exist or closed indices. Either `true` or `false`
  can be specified.
  
  `allow_no_indices`::
  
  Controls whether to fail if a wildcard indices expressions results into no
  concrete indices. Either `true` or `false` can be specified. For example if
  the wildcard expression `foo*` is specified and no indices are available that
  start with `foo` then depending on this setting the request will fail. This
  setting is also applicable when `_all`, `*` or no index has been specified. This
  settings also applies for aliases, in case an alias points to a closed index.
  
  `expand_wildcards`::
  
  Controls to what kind of concrete indices wildcard indices expression expand
  to. If `open` is specified then the wildcard expression is expanded to only
  open indices and if `closed` is specified then the wildcard expression is
  expanded only to closed indices. Also both values (`open,closed`) can be
  specified to expand to all indices.
  +
  If `none` is specified then wildcard expansion will be disabled and if `all`
  is specified, wildcard expressions will expand to all indices (this is equivalent
  to specifying `open,closed`).
  
  The defaults settings for the above parameters depend on the api being used.
  
  NOTE: Single index APIs such as the <<docs>> and the
  <<indices-aliases,single-index `alias` APIs>> do not support multiple indices.
  
negative.code: `static_name`:: is the static text part of the name
  `date_math_expr`:: is a dynamic date math expression that computes the date dynamically
  `date_format`:: is the optional format in which the computed date should be rendered. Defaults to `YYYY.MM.dd`.
  `time_zone`:: is the optional time zone. Defaults to `utc`.
  
  Date math expressions are resolved locale-independent. Consequently, it is not possible to use any other
  calendars than the Gregorian calendar.
  