This file is indexed.

/etc/blkid.conf is in libblkid1 2.20.1-5.1ubuntu20.

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

The actual contents of the file can be viewed below.

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# Perform simple UUID and LABEL lookups using udev information first,
# fall back to scanning if not found
EVALUATE=udev,scan

# Send a change uevent if we discover that a symlink is wrong
SEND_UEVENT=yes

# udev-based systems should not store the cache over a reboot, so we
# place it in /dev
CACHE_FILE=/dev/.blkid.tab