correct handling of field translate data fetch in get translate data endpoint

After retrieving field translation, this attempted to fetch index translation which didn't work because this is not an index translation request.

http/handler.go

@@ -1978,6 +1978,7 @@ func (h *Handler) handleGetTranslateData(w http.ResponseWriter, r *http.Request)
 		if _, err := p.WriteTo(w); err != nil {
 			h.logger.Errorf("error streaming translation data: %s", err)
 		}
+		return
 	}
 
 	// Otherwise read partition parameter for index translation copy.