This file is indexed.

/etc/lsb-release is in base-files 10.1ubuntu2.2.

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

The actual contents of the file can be viewed below.

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DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"