The configuration of the ElasticSearchLookupService Controler Service is pretty straight forward as you have noticed. It uses another controller service, a ElasticSearchClientServiceImpl service, to connect to the Elastic service.
 
Most of the connectivity details need to be specified on the ElasticSearchClientServiceImpl service configuration.
 
The best place for reference is the documentation:
 
Cheers,
André
					
				
			
			
				
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