NEXUS-5641 honour lucene.fsdirectory.type during index update

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
NEXUS-5641: Update MI to last pseudo release
Merge pull request #793 from sonatype/NEXUS-5641_honour_lucene_fstype_during_index_update

NEXUS-5641 honour lucene.fsdirectory.type during index update