/etc/solr/conf/velocity/facet_fields.vm is in solr-common 3.6.2+dfsg-10+deb9u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #if($response.facetFields)
<h2 #annTitle("Facets generated by adding &facet.field= to the request")>Field Facets</h2>
#foreach($field in $response.facetFields)
<span class="facet-field">$field.name</span>
<ul>
#foreach($facet in $field.values)
<li><a href="#url_for_facet_filter($field.name, $facet.name)">$facet.name</a> ($facet.count)</li>
#end
</ul>
#end
#end
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