BUG: Added missing call to FileStream::Flush() in FSIndexOutput::Flush() that was preventing persistence to disk from occuring at the necessary phase (fixes LUCENENET-645)
BUG: Added missing call to FileStream::Flush() in FSIndexOutput::Flush() that was preventing persistence to disk from occuring at the necessary phase (fixes LUCENENET-645)

apache/lucenenet,jeme/lucenenet,apache/lucenenet,sisve/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet,sisve/lucenenet,jeme/lucenenet,NightOwl888/lucenenet,NightOwl888/lucenenet,NightOwl888/lucenenet,apache/lucenenet,jeme/lucenenet