如何在lucene中索引日期字段

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.document.LongPoint;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.NumericUtils;

import java.io.IOException;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.Date;

public class LuceneDateIndexingExample {
    public static void main(String[] args) {
        String indexPath = "path/to/index";
        String dateFieldName = "created_date";

        // 创建索引目录
        Directory directory;
        try {
            directory = FSDirectory.open(Paths.get(indexPath));
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }

        // 创建索引写入器
        IndexWriterConfig config = new IndexWriterConfig();
        IndexWriter writer;
        try {
            writer = new IndexWriter(directory, config);
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }

        // 创建文档
        Document doc = new Document();

        // 添加日期字段
        Date createdDate = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String formattedDate = dateFormat.format(createdDate);
        doc.add(new TextField(dateFieldName, formattedDate, Field.Store.YES));

        // 添加数值字段（可选，用于范围搜索）
        long numericDate = NumericUtils.longToSortableBytes(createdDate.getTime());
        doc.add(new LongPoint(dateFieldName + "_numeric", numericDate));

        // 添加文档到索引
        try {
            writer.addDocument(doc);
            writer.commit();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}