anchor.diff:  boundaries.  The `boundary_max_scan` setting controls how far to scan for
   boundary characters. Only valid for the `fvh` highlighter.
   `sentence`::: Break highlighted fragments at the next sentence boundary, as
  -determined by Java's 
  +determined by Java's
   https://docs.oracle.com/javase/8/docs/api/java/text/BreakIterator.html[BreakIterator].
   You can specify the locale to use with `boundary_scanner_locale`.
   +
  
positive.code: This is useful for highlighting the entire contents of a document or field.
  
  
  [[highlighter-internal]]
  ==== How highlighters work internally
  
  To learn how highlighters work internally check the document
  <<highlighter-internal-work, How highlighters work internally>>.
negative.code: it doesn't require reanalyzing the text to be highlighted. It also requires less
  disk space than using `term_vectors`.
  
  * Term vectors. If `term_vector` information is provided by setting
  `term_vector` to `with_positions_offsets` in the mapping, the `unified`
  highlighter automatically uses the `term_vector` to highlight the field.
  It's fast especially for large fields (> `1MB`) and for highlighting multi-term queries like
  