To create an On-Premise HA Search service, you'll need separate Search nodes configured as part of the larger HA deployment.
The following diagram shows the simplest HA configuration for On-Premise Search (your configuration may vary):
Note: The Ingress Replicators and Search nodes have built-in health checks via
host:port/loadbalance/eligible. Therefore, the load balancer can maintain the pool of
available nodes via the health check and then round-robin requests across available
nodes. In this way, the load balancer can detect any failures of Ingress Replicator(s)
or Search nodes.
