Analyzer analyzerForIndex = _fieldManager.getAnalyzerForIndex();
IndexWriterConfig conf = new IndexWriterConfig(LUCENE_VERSION, analyzerForIndex);
// conf.setMergePolicy(NoMergePolicy.NO_COMPOUND_FILES);
TieredMergePolicy mergePolicy = (TieredMergePolicy) conf.getMergePolicy();
mergePolicy.setUseCompoundFile(false);
_commitWriter = new IndexWriter(commitDirectory, conf.clone());
// Make sure there's an empty index...
new IndexWriter(_mainDirectory, conf.clone()).close();
_mainWriter = new IndexWriter(_mainDirectory, conf.clone());
BufferStore.initNewBuffer(128, 128 * 128);