title: Elasticsearch: multiple pre_tags/post_tags with fast vector highlighter
body: <p>The documentation includes the following cryptic remark in regards to the pre_tags/post_tags settings capable of containing more than one pair of pre-/post-tags: </p>
  
  <blockquote>
    <p>Using the fast vector highlighter there can be more tags, and the
    "importance" is ordered.</p>
  </blockquote>
  
  <p>Does anyone know what is the precise meaning of the statement?</p>