[Argorak]

Probably because some store features have been missing up to 1.0, like backup/restore without knowing database internals. (yes, rsync did the job, but only because you knew the list of guarantees that makes it possible).

Also, Lucene at its core is an Index. Changing the query strategy might require reindexing. It is perfectly valid to throw data at it, build the index and throw away the source. You will just never get it back again.

While ES can be used and tuned as a store just fine, it is not necessarily its raison d'etre.