title: REST API response handling when 1 of many endpoint fails
body: <p>I have a Java Application(REST API, Jersey) that orchestrates a lot of backend calls for the front end.
  It aggregates data from all the backend systems and then returns a JSON response.</p>
  <p>Now I have to integrate one more backend system, so I added the response from the new backend API into the Aggregate response.
  This new data is not super important so I don't want to fail the entire response if this new Call fails.</p>
  <p>What is the best elegant way to do this and also inform the clients that one of the calls failed?</p>