anchor.diff:    `object`. The mapping also allows you to define (amongst other things)
     how the value for a field should be analyzed.
   
  +[[glossary-filter]] filter ::
  +
  +  A filter is a non-scoring <<glossary-query,query>>, meaning that it does not score documents.
  +  It is only concerned about answering the question - "Does this document match?". 
  +  The answer is always a simple, binary yes or no. This kind of query is said to be made 
  +  in a <<query-filter-context,filter context>>, 
  +  hence it is called a filter. Filters are simple checks for set inclusion or exclusion. 
  +  In most cases, the goal of filtering is to reduce the number of documents that have to be examined.
  +
   [[glossary-index]] index ::
   
     An index is like a _table_ in a relational database. It has a
  
positive.code:   index is created.
    +
    See also <<glossary-routing,routing>>
  
   [[glossary-replica-shard]] replica shard ::
  
  
negative.code: 
    A term is an exact value that is indexed in Elasticsearch. The terms
    `foo`, `Foo`, `FOO` are NOT equivalent. Terms (i.e. exact values) can
    be searched for using _term_ queries.
    +
    See also <<glossary-text,text>> and <<glossary-analysis,analysis>>.
  
  [[glossary-text]] text ::
  
  