anchor.diff:  
   [[glossary-hidden-index]] hidden index ::
   // tag::hidden-index-def[]
  -An index that is excluded by default when you access indices using a wildcard expression. 
  +An index that is excluded by default when you access indices using a wildcard expression.
   You can specify the `expand_wildcards` parameter to include hidden indices.
   Note that hidden indices _are_ included if the wildcard expression starts with a dot, for example `.watcher-history*`.
   // end::hidden-index-def[]
  
positive.code: 
  [[glossary-system-index]] system index ::
  // tag::system-index-def[]
  An index that contains configuration information or other data used internally by the system, 
  such as the `.security` index. 
  The name of a system index is always prefixed with a dot.
  You should not directly access or modify system indices.
  // end::system-index-def[]
  
negative.code: // end::routing-def[]
  --
  
  [[glossary-runtime-fields]] runtime field ::
  // tag::runtime-fields-def[]
  A runtime field is a field that is evaluated at query time. You access runtime
  fields from the search API like any other field, and {es} sees runtime fields
  no differently. You can define runtime fields in the
  {ref}/runtime-mapping-fields.html[index mapping] or in the
  {ref}/runtime-search-request.html[search request].
  // end::runtime-fields-def[]
  
  [[glossary-searchable-snapshot]] searchable snapshot ::
  // tag::searchable-snapshot-def[]
  A <<glossary-snapshot, snapshot>> of an index that has been mounted as a
  