This file is indexed.

/usr/lib/python2.7/doc/perl/isilo.perl is in python-old-doctools 2.5.5-2.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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package main;

$USING_STYLES = 0;
$NO_NAVIGATION = 1;
$INDEX_COLUMNS = 1;
$MODULE_INDEX_COLUMNS = 1;

sub child_line {
    return '';
}

1;      # stupid perl...