For version ES 6.4.1, we were able to pass an argument to ignore the ssl_enablement and the installer worked correctly on our search head deployer. The command was: splunk search '| essinstall --deployment_type shc_deployer --ssl_enablement ignore' -auth admin:<pwd>
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I encountered the same problem in my environment , we use "schedule search"+"| loadjob" in our dashboard for access control to avoid granting user index access. We seek help from Splunk support, they suggested us to increase the number of max_peer_rep_load, but they didn't know what the number should be increased to, we need to try it by self .
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