After ISPN-7803 gets in DeltaAware should be deprecated and any current use replaced with functional commands.

Cache.applyDelta will be deprecated, too, implementation replaced by a functional call/compute.
ApplyDeltaCommand should be deprecated, any implementation of visitApplyDeltaCommand in interceptor stack removed.

DeltaAwareCacheEntry and all its uses will be removed immediately.

Flag.DELTA_WRITE will be deprecated and all its uses removed.

We can't really test if the semantics is preserved since it's broken by design, but let's at least make sure that we don't break infinispan-lucene-directory (which should be migrated later on).