This file is indexed.

/usr/lib/mysql-testsuite/t/percona_bug856404-master.opt is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

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

The actual contents of the file can be viewed below.

1
--query-cache-size=10M --query-cache-strip-comments