There don't seem to be any really good examples of how to search a document collection and display kwic summaries of hits grouped by document, so it took me a little puzzling to figure this one out. Most of the examples show processing only of the first hit in a document. Here's my sample code:

xquery version "1.0";

declare default element namespace "http://www.tei-c.org/ns/1.0";
declare namespace tei="http://www.tei-c.org/ns/1.0";
declare namespace ft="http://exist-db.org/xquery/lucene";
import module namespace kwic="http://exist-db.org/xquery/kwic";
declare namespace util="http://exist-db.org/xquery/util";
declare namespace exist="http://exist.sourceforge.net/NS/exist";
declare namespace xh="http://www.w3.org/1999/xhtml";

for $hit in //TEI/text[ft:query(., 'henslowe')]
let $expanded := kwic:expand($hit),
$config := <config xmlns="" width="40"/>,
$t := $hit/ancestor::TEI
order by ft:score($hit) descending
return
<xh:div>
<xh:h3><xh:a href="{xs:string($t/@xml:id)}.htm">{$t/teiHeader/fileDesc/titleStmt/title[1]/text()}</xh:a></xh:h3>
{
for $h in $expanded//exist:match
return
kwic:get-summary($expanded, $h, $config)
}
</xh:div>