Per the provided reference URL https://docs.splunk.com/Documentation/Splunk/7.3.1/Admin/User-seedconf
"To set the default username and password, place user-seed.conf in $SPLUNK_HOME/etc/system/local. You must restart Splunk to enable configurations. If the $SPLUNK_HOME/etc/passwd file is present, the settings in this file (user-seed.conf) are not used."

Explanation/Reference:
https://docs.splunk.com/Documentation/Splunk/7.3.1/Indexer/Howclusteredsearchworks

Reference:
https://docs.splunk.com/Documentation/MSApp/2.0.3/MSInfra/Setupadeploymentserver
"To activate deployment server, you must place at least one app into %SPLUNK_HOME%\etc\deployment-apps on the host you want to act as deployment server. In this case, the app is the "send to indexer" app you created earlier, and the host is the indexer you set up initially.

https://docs.splunk.com/Documentation/Splunk/8.1.2/Security/Dataintegritycontrol#:~:text=When%20you%20enable%20data%20integrity%20control%2C%20Splunk%20Enterprise%20computes%20hashes,it%20to%20a%20l1Hashes%20file.