This file is indexed.

/etc/prelude/default/tls.conf is in libprelude2v5 1.0.0-11.7ubuntu1.

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

The actual contents of the file can be viewed below.

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#
# Default size of the client/server generated private key 
#
generated-key-size = 2048

#
# Number of days the authority certificates (server side) will
# remain valid. Theses certificate are only used in order to 
# sign client certificate.
# 
# Use 0 for the maximum possible value.
#
authority-certificate-lifetime = 0

#
# Number of days the generated certificates (client side) will
# remain valid. Theses certificate are only used in order to 
# authenticate and encrypt client <-> server communication.
# 
# Use 0 for the maximum possible value.
#
generated-certificate-lifetime = 0