12-21-2017 09:16 AM
01-02-2018 04:44 PM
Only a single active search head is supported which is likely why you are seeing the status of the "secondary" as down. If the currently active search head fails, the secondary member in the cluster or another available member in the cluster should automatically take over the seach head role.
There are some additional details in the Reporting section of the Admin Guide which you can find here:
I hope that helps!