Currently, the FHIR module doesn’t support paging.
FHIR RESTful servers may optionally support paging responses, meaning that if a search returns 500 resources, the server can return a bundle containing only the first 20 and a link which will return the next 20, etc.
By default, FHIR RESTful servers will not page, but will rather return all resources immediately in a single bundle. There are two ways to support paging: Paging providers and Bundle providers.
From documentation Paging Responses, it seems to be straight forward 
. I am creating this topic to discuss the best way of implementing paging support in FHIR module.