docs: @Override
      protected Observable construct() {
          Observable result;
          try {
              Observable observable = toObservable(commandActions.getCommandAction().execute(executionType));
              result = observable
                      .onErrorResumeNext(new Func1<Throwable, Observable>() {
                          @Override
                          public Observable call(Throwable throwable) {
                              if (isIgnorable(throwable)) {
                                  return Observable.error(new HystrixBadRequestException(throwable.getMessage(), throwable));
                              }
                              return Observable.error(throwable);
                          }
                      });
              flushCache();
          } catch (CommandActionExecutionException throwable) {
              Throwable cause = throwable.getCause();
              if (isIgnorable(cause)) {
                  throw new HystrixBadRequestException(cause.getMessage(), cause);
              }
              throw throwable;
          }
          return result;
      }