code: MemberImpl getMissingMember(Address address, String uuid) {
          Map<Object, MemberImpl> m = missingMembersRef.get();
          return isHotRestartEnabled() ? m.get(uuid) : m.get(address);
      }
docs: Returns the missing member using either its {@code UUID} or its {@code Address}
  depending on Hot Restart is enabled or not.
  
  @param address Address of the missing member
  @param uuid Uuid of the missing member
  @return the missing member