有没有办法从java中读取.fdt/.fdx/.fdxt文件中的文本？

<dependency>
    <groupId>org.apache.lucene</groupId>
    <artifactId>lucene-core</artifactId>
    <version>8.10.1</version>
</dependency>

import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.FSDirectory;

String indexPath = "/path/to/index"; // 指定.fdt/.fdx/.fdxt文件所在的目录
FSDirectory directory = FSDirectory.open(Paths.get(indexPath));

IndexReader reader = DirectoryReader.open(directory);

IndexSearcher searcher = new IndexSearcher(reader);

String fieldName = "content"; // 指定要搜索的字段名
String keyword = "example"; // 指定要搜索的关键词
Query query = new TermQuery(new Term(fieldName, keyword));

int topN = 10; // 指定返回的搜索结果数量
TopDocs topDocs = searcher.search(query, topN);
ScoreDoc[] scoreDocs = topDocs.scoreDocs;

for (ScoreDoc scoreDoc : scoreDocs) {
    int docId = scoreDoc.doc;
    Document document = searcher.doc(docId);
    String text = document.get(fieldName);
    System.out.println(text);
}