/usr/share/ipa/updates/50-nis.update is in freeipa-server 4.7.0~pre1+git20180411-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Updates are applied only if NIS plugin has been configured
# update definitions are located in install/share/nis-update.uldif
plugin: update_nis_configuration
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