docs: public ResponseType execute() {
          try {
              return queue().get();
          } catch (Throwable e) {
              if (e instanceof HystrixRuntimeException) {
                  throw (HystrixRuntimeException) e;
              }
              // if we have an exception we know about we'll throw it directly without the threading wrapper exception
              if (e.getCause() instanceof HystrixRuntimeException) {
                  throw (HystrixRuntimeException) e.getCause();
              }
              // we don't know what kind of exception this is so create a generic message and throw a new HystrixRuntimeException
              String message = getClass().getSimpleName() + " HystrixCollapser failed while executing.";
              logger.debug(message, e); // debug only since we're throwing the exception and someone higher will do something with it
              //TODO should this be made a HystrixRuntimeException?
              throw new RuntimeException(message, e);
          }
      }