This file is indexed.

/usr/share/selinux/ubuntu/include/global_booleans.xml is in selinux-policy-ubuntu-dev 0.2.20091117-0ubuntu2.

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

The actual contents of the file can be viewed below.

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<bool name="secure_mode" dftval="false">
<desc>
<p>
Enabling secure mode disallows programs, such as
newrole, from transitioning to administrative
user domains.
</p>
</desc>
</bool>
<bool name="secure_mode_insmod" dftval="false">
<desc>
<p>
Disable transitions to insmod.
</p>
</desc>
</bool>
<bool name="secure_mode_policyload" dftval="false">
<desc>
<p>
boolean to determine whether the system permits loading policy, setting
enforcing mode, and changing boolean values.  Set this to true and you
have to reboot to set it back
</p>
</desc>
</bool>