This file is indexed.

/usr/share/doc/cloud-init/examples/include-once.txt is in cloud-init 0.7.6~bzr976-2.

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

The actual contents of the file can be viewed below.

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#include-once
# entries are one url per line. comment lines beginning with '#' are allowed
# urls are passed to urllib.urlopen, so the format must be supported there
# This entries will just be processed ONE TIME by cloud-init, any further
# iterations won't process this file
http://www.ubuntu.com/robots.txt
http://www.w3schools.com/html/lastpage.htm