使用索引查询返回nullPointerExciption时使用spring boot的Elasticsearch

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

spring.data.elasticsearch.cluster-nodes=localhost:9300

import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;

@Document(indexName = "your_index_name", type = "your_type_name")
public class YourEntity {
    @Id
    private String id;
    private String field1;
    private String field2;
    
    // Getters and setters
}

import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;

public interface YourEntityRepository extends ElasticsearchRepository<YourEntity, String> {
    // 可以在这里定义自定义查询方法
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class YourService {
    private final YourEntityRepository repository;
    
    @Autowired
    public YourService(YourEntityRepository repository) {
        this.repository = repository;
    }
    
    public List<YourEntity> search(String keyword) {
        // 使用repository的方法进行查询操作
        return repository.findByField1Containing(keyword);
    }
}