}
public void testAddDeleteDocumentError1() throws Exception {
try {
IndexReader reader = IndexReader.open(directory);
IndexWriter writer = new IndexWriter(directory, new SimpleAnalyzer(), false);
Document document = new Document();
document.add(new Field("id", "1", Field.Store.YES, Field.Index.UN_TOKENIZED));
document.add(new Field("field", "a sample", Field.Store.YES, Field.Index.TOKENIZED));
document.add(new Field("filter", "a sample filter", Field.Store.YES, Field.Index.TOKENIZED));