(PECL solr >= 0.9.2)
SolrQuery::setHighlightRequireFieldMatch — Require field matching during highlighting
If true, then a field will only be highlighted if the query matched in this particular field.
This will only work if SolrQuery::setHighlightUsePhraseHighlighter() was set to true
Returns the current SolrQuery object, if the return value is used.