This file is indexed.

/usr/share/dovecot/conf.d/auth-checkpassword.conf.ext is in dovecot-core 1:2.0.19-0ubuntu2.1.

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

The actual contents of the file can be viewed below.

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# Authentication for checkpassword users. Included from auth.conf.
#
# <doc/wiki/AuthDatabase.CheckPassword.txt>

passdb {
  driver = checkpassword
  args = /usr/bin/checkpassword
}

# passdb lookup should return also userdb info
userdb {
  driver = prefetch
}

# Standard checkpassword doesn't support direct userdb lookups.
# If you need checkpassword userdb, the checkpassword must support
# Dovecot-specific extensions.
#userdb {
#  driver = checkpassword
#  args = /usr/bin/checkpassword
#}