This file is indexed.

/usr/share/postgresql/10/extension/isn.control is in postgresql-10 10.6-0ubuntu0.18.04.1.

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

The actual contents of the file can be viewed below.

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# isn extension
comment = 'data types for international product numbering standards'
default_version = '1.1'
module_pathname = '$libdir/isn'
relocatable = true