anchor.diff:  values, all these values will be used as alternative categories.
   
   [float]
  -==== Category Mapping
  +===== Category Mapping
   
   The mapping for a category is simply defined by its `default` values. These can either be
   defined as list of *default* categories:
  
positive.code: --------------------------------------------------
  
  [float]
  ==== Category Query
  A query within a category works similar to the configuration. If the value is `null`
  the mappings default categories will be used. Otherwise the suggestion takes place
  for all documents that have at least one category in common with the query.
  
negative.code: 
  [[suggester-context-geo]]
  [float]
  ==== Geo location Context
  A `geo` context allows you to limit results to those that lie within a certain distance
  of a specified geolocation. At index time, a lat/long geo point is converted into a
  geohash of a certain precision, which provides the context.
  
  [float]
  ===== Geo location Mapping
  The mapping for a geo context accepts four settings, only of which `precision` is required:
  
  [horizontal]
  