If you don't configure each search head to search all the peers in the indexer cluster, you won't have it working properly.
The search head cluster is a cluster in an horizontal way, the search heads share configuration and other knowledge objects (this can be customized) and then you need to configure each one of them for the vertical link with the indexing layer, in the same Distributed Searches always worked in Splunk.
I know it would be cool if the captain search head talked to the cluster master, and then inform the others but at this stage that sounds much more complicated to do.
I hope I threw some light in there 🙂
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