如何在spring boot中将批量json文件索引到elasticsearch

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

@Document(indexName = "my_index", type = "my_type")
public class MyDocument {
    @Id
    private String id;
    private String field1;
    private String field2;
    // 其他字段
    // getter和setter方法
}

public interface MyDocumentRepository extends ElasticsearchRepository<MyDocument, String> {
    // 自定义查询方法
}

@Service
public class MyService {
    @Autowired
    private MyDocumentRepository documentRepository;

    public void indexJsonFiles(List<String> fileNames) {
        for (String fileName : fileNames) {
            // 读取JSON文件，解析数据为MyDocument对象
            List<MyDocument> documents = parseJsonFile(fileName);
            // 批量索引到Elasticsearch
            documentRepository.saveAll(documents);
        }
    }

    private List<MyDocument> parseJsonFile(String fileName) {
        // 解析JSON文件，返回MyDocument对象列表
    }
}

@Autowired
private MyService myService;

public void someMethod() {
    List<String> fileNames = Arrays.asList("file1.json", "file2.json");
    myService.indexJsonFiles(fileNames);
}