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Search system diagram (outscale)

To outscale Search, set up a Search Host Primary Server and multiple Search Host Replica Servers behind a Network Load Balancer. On the Content Manager Server, configure the Search Query Engine—integrated with the Content Manager Server—to communicate with the Network Load Balancer, and Search Indexer service to communicate to the Primary Server (for indexing).

Search Indexer service
The Search Indexer service is the SDL Tridion Sites Windows service responsible for passing data that requires indexing to the Search Host service.
Search Host service
The Search Host service is an SDL Tridion Sites Windows service responsible for indexing data.
Search Host Primary Server
A Search Host Primary Server performs the indexing of data in an outscale scenario. The Primary Server can also optionally perform search.
Search Host Replica Server
A Search Host Replica Server receives and responds to search queries from a Primary in an outscale scenario.