This file is indexed.

/usr/share/postgresql/10/extension/q3c.control is in postgresql-q3c 1.5.0-3build1.

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

The actual contents of the file can be viewed below.

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comment = 'q3c sky indexing plugin'
default_version = '1.5.0'
module_pathname = '$libdir/q3c'