This file is indexed.

/usr/share/gnome-shell/modes/ubuntu.json is in gnome-shell-common 3.28.1-0ubuntu2.

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

The actual contents of the file can be viewed below.

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{
    "parentMode": "user",
    "stylesheetName": "ubuntu.css",
    "enabledExtensions": ["ubuntu-dock@ubuntu.com", "ubuntu-appindicators@ubuntu.com"]
}