This file is indexed.

/usr/share/thumbnailers/gnome-web-photo.thumbnailer is in gnome-web-photo 0.10.1-0ubuntu1.

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

The actual contents of the file can be viewed below.

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[Thumbnailer Entry]
TryExec=gnome-web-photo
Exec=gnome-web-photo --mode=thumbnail --timeout=16 --thumbnail-size=%s %u %o
MimeType=text/html;application/xhtml+xml;