the
# recency index to select candidate nodes and &quot;fields&quot; to limit the
# output to file names only. Then we&#39;re using the &quot;expression&quot; term to
# further constrain the results.
my $last_update_line = &quot;&quot;;
if (substr($last_update_token, 0, 1) eq &quot;c&quot;) {
        $last_update_token = &quot;\&quot;$last_update_token\&quot;&quot;;
        $last_update_line = qq[\n&quot;since&quot;: $last_update_token,];
}
my $query = &lt;&lt;&quot; END&quot;;
        [&quot;query&quot;, &