public static final Logger log = Logger.getLogger(DiskSearchIndex.class);
public DiskSearchIndex(DirectoryManager<V> dirMgr, IndexReaderDecorator<R> decorator,SearchIndexManager<R,V> idxMgr){
super(idxMgr, true);
_dirMgr = dirMgr;
_mergePolicyParams = new MergePolicyParams();
_dispenser = new IndexReaderDispenser<R,V>(_dirMgr, decorator,this);
_mergeScheduler = new SerialMergeScheduler();
_deletionPolicy = new ZoieIndexDeletionPolicy();
}