/etc/solr/conf/velocity/facet_ranges.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 | <h2 #annTitle("Facets generated by adding &facet.range= to the request")>Range Facets</h2>
#foreach ($field in $response.response.facet_counts.facet_ranges)
#set($name = $field.key)
#set($display = "$name")
#set($f = $field.value.counts)
#set($start = $field.value.start)
#set($end = $field.value.end)
#set($gap = $field.value.gap)
#set($before = $field.value.before)
#set($after = $field.value.after)
#display_facet_range($f, $display, $name, $start, $end, $gap, $before, $after)
#end
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