IndexWriter

// initialization
Directory index = new NIOFSDirectory(Paths.get("/index"));
IndexWriterConfig config = new IndexWriterConfig();
IndexWriter writer = new IndexWriter(index, config);

// create a document
Document doc = new Document();
doc.add(new TextField("title", "Lucene - IndexWriter", Field.Store.YES));
doc.add(new StringField("author", "aliyun", Field.Store.YES));

//index a document
writer.addDocument(doc);
writer.commit();