This file is indexed.

/etc/cloud/templates/hosts.redhat.tmpl is in cloud-init 0.7.5-0ubuntu1.18.

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

The actual contents of the file can be viewed below.

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#*
    This file /etc/cloud/templates/hosts.redhat.tmpl is only utilized
    if enabled in cloud-config.  Specifically, in order to enable it
    you need to add the following to config:
      manage_etc_hosts: True
*#
# Your system has configured 'manage_etc_hosts' as True.
# As a result, if you wish for changes to this file to persist
# then you will need to either
# a.) make changes to the master file in /etc/cloud/templates/hosts.redhat.tmpl
# b.) change or remove the value of 'manage_etc_hosts' in
#     /etc/cloud/cloud.cfg or cloud-config from user-data
# 
# The following lines are desirable for IPv4 capable hosts
127.0.0.1 ${fqdn} ${hostname} 
127.0.0.1 localhost.localdomain localhost
127.0.0.1 localhost4.localdomain4 localhost4

# The following lines are desirable for IPv6 capable hosts
::1 ${fqdn} ${hostname}
::1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6