Lucene的deleteDocuments的一个疑问？

Question

问题：

为什么调用了删除部分文档后，全部文档都找不到了？

项目已上传

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索引文件：

/Users/mac/Lucene/data/data_04.txt
/Users/mac/Lucene/data/data_05.txt
/Users/mac/Lucene/data/data_02.txt
/Users/mac/Lucene/data/data_03.txt
/Users/mac/Lucene/data/data_01.txt

索引文档结构：

private Document getDocument(File file) throws IOException {
        Document document = new Document();
        // index file contents
        Field contentField = new Field(Constants.CONTENTS, new FileReader(file));
        // index file name
        Field fileNameField = new Field(Constants.FILE_NAME, file.getName(), Field.Store.YES, Field.Index.NOT_ANALYZED);
        // index file path
        Field filePathField = new Field(Constants.FILE_PATH, file.getCanonicalPath(), Field.Store.YES, Field.Index.NOT_ANALYZED);
        // index file length
        Field fileLengthField = new Field(Constants.FILE_LENGTH, file.length() + "", Field.Store.YES, Field.Index.NOT_ANALYZED);
        document.add(contentField);
        document.add(fileNameField);
        document.add(filePathField);
        document.add(fileLengthField);
        return document;
}

创建文档方法：

private void indexFile(File file) throws IOException {
        log.info("Indexing -> " + file.getCanonicalPath());
        Document document = getDocument(file);
        writer.addDocument(document);
}

查询文档方法：

public TopDocs searchUsingPrefixQuery(String searchQuery) throws IOException {
        Term term = new Term(Constants.FILE_NAME, searchQuery);
        Query query = new PrefixQuery(term);
        return indexSearcher.search(query, Constants.MAX_SEARCH);
}

删除文档方法：

private void deleteFile(String name) throws IOException {
        writer.deleteDocuments(new PrefixQuery(new Term(Constants.FILE_NAME, name)));
        writer.commit();
}

测试入口及输出：

public static void main(String[] args) {
        Test tester;
        try {
            tester = new Test();
            tester.createIndex();
            tester.search("data");
            tester.deleteIndex("data_01.txt");
            tester.search("data");
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        }
}

20:08:12.624 [main] INFO com.neo.code.lucene.demo01.Test - [searching files]: 5
20:08:12.634 [main] INFO com.neo.code.lucene.demo01.Test - [searching files]: 0