This file is indexed.

/lib/systemd/system/approx.socket is in approx 5.5-2build1.

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

The actual contents of the file can be viewed below.

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[Unit]
Description=caching proxy server for Debian archive files
Documentation=man:approx(8)

[Socket]
ListenStream=9999
Accept=yes

[Install]
WantedBy=sockets.target