This file is indexed.

/etc/request-key.d/id_resolver.conf is in nfs-common 1:1.2.8-6ubuntu1.

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

The actual contents of the file can be viewed below.

1
create	id_resolver	*	*	/usr/sbin/nfsidmap -t 600 %k %d