From - https://docs.splunk.com/Documentation/Splunk/6.4.4/Indexer/Configurationbundleissues
I added below contents and commented in INDEXER cluster master's server.conf
[sslConfig]
allowSslCompression = false
[clustering]
heartbeat_timeout = 600
and commented "pass4SymmKey"
RESTARTED splunk service, then apply cluster bundle
hope it helps.
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