anchor.diff:  To see the `keyword` attribute for these tokens, add the following arguments to
   the analyze API request:
   
  -* `explain`:  `true`
  +* `explain`: `true`
   * `attributes`: `keyword`
   
   [source,console]
  
positive.code: }
  ----
  
  The API returns the following response.  Note the `jumping` token has a
  `keyword` attribute of `true`.
  
  [source,console-result]
  
negative.code: 
  Marks specified tokens as keywords, which are not stemmed.
  
  The `keyword_marker` filter assigns specified tokens a `keyword` attribute of
  `true`. Stemmer token filters, such as
  <<analysis-stemmer-tokenfilter,`stemmer`>> or
  <<analysis-porterstem-tokenfilter,`porter_stem`>>, skip tokens with a `keyword`
  attribute of `true`.
  
  