public Flowable<String> getKeys() {
        return getKeysByPattern(null);
    }
@Test
    public void testMassDelete() {
        RBucketRx<String> bucket = redisson.getBucket("test");
        sync(bucket.set("someValue"));
        RMapRx<String, String> map = redisson.getMap("map2");
        sync(map.fastPut("1", "2"));

        Assertions.assertEquals(2, sync(redisson.getKeys().delete("test", "map2")).intValue());
        Assertions.assertEquals(0, sync(redisson.getKeys().delete("test", "map2")).intValue());
    }