Expert: A Directory instance that switches files between
two other Directory instances.
Files with the specified extensions are placed in the
primary directory; others are placed in the secondary
directory. The provided Set must not change once passed
to this class, and must allow multiple threads to call
contains at once.NOTE: this API is new and experimental and is
subject to suddenly change in the next release.
Namespace: Lucene.Net.StoreAssembly: Lucene.Net (in Lucene.Net.dll) Version: 2.9.4.1