使用Springboot从Elasticsearch查询不可预测的JSON对象

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ElasticsearchController {

    @Autowired
    private RestHighLevelClient elasticsearchClient;

    @GetMapping("/search")
    public String search() {
        try {
            SearchRequest searchRequest = new SearchRequest("your_index_name");
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            searchSourceBuilder.query(QueryBuilders.matchAllQuery());
            searchRequest.source(searchSourceBuilder);

            SearchResponse searchResponse = elasticsearchClient.search(searchRequest, RequestOptions.DEFAULT);
            SearchHit[] searchHits = searchResponse.getHits().getHits();

            for (SearchHit hit : searchHits) {
                String json = hit.getSourceAsString();
                // 处理JSON对象
                // ...
            }

            return "Search completed.";
        } catch (Exception e) {
            e.printStackTrace();
            return "Error occurred during search.";
        }
    }
}