Background

Using Solr 4.0.0. I've indexed the text of a set of sample documents and enabled Term Vectors so I can use Fast Vector Highlighting

<field name="raw_text" type="text_en" indexed="true" stored="true" termVectors="true" termPositions="true" termOffsets="true" />

For highlighting I'm using the Break Iterator Boundary Scanner with SENTENCE boundaries.

<boundaryScanner name="breakIterator" class="solr.highlight.BreakIteratorBoundaryScanner">
    <lst name="defaults">
      <!-- type should be one of CHARACTER, WORD(default), LINE and SENTENCE -->
      <str name="hl.bs.type">SENTENCE</str>
    </lst>
  </boundaryScanner>

I do a simple query

http://localhost:8983/solr/documents/select?q=raw_text%3AArtibonite&wt=xml&hl=true&hl.fl=raw_text&hl.useFastVectorHighlighter=true&hl.snippets=100&hl.boundaryScanner=breakIterator

Highlighting is working fairly well 

<response>
...
<result name="response" numFound="5" start="0">
<doc>
  <str name="id">-1071691270</str>
  <str name="raw_text">
     Final Report of the Independent Panel of Experts on the Cholera
     Outbreak in Haiti Dr. Alejando Cravioto (Chair) International
     Center for Diarrhoeal Disease Research, Dhaka, Bangladesh Dr.
     Claudio F. Lanata Instituto de Investigación Nutricional, and
     The US Navy Medical Research Unit 6, Lima, Peru Engr. Daniele
     S. Lantagne Harvard University... ~SNIP~
  </str>
<doc>
<lst name="highlighting">
  <lst name="-1071691270">
    <arr name="raw_text">
      ...
      <str>
        The timeline suggests that the outbreak spread along
        the <em>Artibonite</em> River. After establishing that
        the cases began in the upper reaches of the Artibonite
        Rive
solr highlighting
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