To diable the cipher legacy suits in the Splunk 7.2 and higher you need to follow below process.
FIrst, you need to perform it on the indexers, you need to add the [node_auth] in the server.conf restart splunkd services
You need to add "legacyCiphers = disabled" below the general stanza and restart the services.
You need to comment out the pass4SymmKey in the clustering stanza and add an other pass4SymmKey on the indexers.
You need to do the same steps on all the indexers and then you need to perform the same steps in the cluster master.
You need to run the command $plunk_home/bin/splunk rotate splunk-secret on the cluster master and the secret key will be distributed to all the indexers.
You can follow the same process on the SH as well, and for search head, you need to run the Secret key on the SH Captain.
Let me know if you face any difficulties.
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