Each cache is described in the /etc/ccu/ccu.conf configuration file, to prevent the data from being cached to certain cache it's enough to set is_enabled setting to the no value in its description.
Please restart ccu after changing the configuration.

Attention : There is one known challenge at the time of this writing, so once the CACHE is being disabled via the is_enabled setting, it becomes entirely hidden fot the ccu, leading to the situation where the cache size is not taken into account. That is if there are two caches - A and B, A occupies 8ТB, B occupies 1ТB, and the total allocated cache size is 10TB, then if A cache is disabled, it will be regarded as the 9TB are still available. So if the disk space volume is not large, then after disabling the cache, it is recommended to deallocate the occupied memory.