Cache data source aggregate functionality was found to be broken
and unused, because of this the decision was made to remove it
rather than fix it.
As it was broken we did not follow typical deprecation methods and
instead the code was removed outright with only structure
remaining and left deprecated.
The solution to this issue was to make the disabled cache factory
return a proper cache writer object when requested rather than a
disabled cache object.
This only changes things when CACHE_DISABLE_ALL has been defined.
