code: public Boolean exists(H key, HK field, HK name, HV value) {
          final byte[] rawKey = rawKey(key);
          final byte[] rawHashKey = rawHashKey(field);
          final byte[] rawElementName = rawHashKey(name);
          final byte[] rawElementValue = rawHashValue(value);
  
          return execute(new RedisCallback<Boolean>() {
              public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                  return ((RedisClusterConnection) connection).slExists(rawKey, rawHashKey, rawElementName,
                          rawElementValue);
              }
          }, true);
      }
docs: /*
  @see SessionOfHashListOperations#exists(java.lang.Object, java.lang.Object, java.lang.Object, java.lang.Object)