An ExcerptProvider retrieves text excerpts for a node in the query result and marks up the words in the text that match the query terms.

By default highlighting words matched the query is disabled because this feature requires that additional information is written to the search index. To enable this feature, you need to add a configuration parameter to the query-handler element in your jcr configuration file to enable it.

<param name="support-highlighting" value="true"/>

Additionally, there is a parameter that controls the format of the excerpt created. In JCR 1.9, the default is set to org.exoplatform.services.jcr.impl.core.query.lucene.DefaultHTMLExcerpt. The configuration parameter for this setting is:

<param name="excerptprovider-class" value="org.exoplatform.services.jcr.impl.core.query.lucene.DefaultXMLExcerpt"/>