设置json string自定义查询为弹性搜索请求java RestHighLevelClient

import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.common.xcontent.XContentType;

import java.io.IOException;

public class ElasticsearchExample {
    public static void main(String[] args) {
        RestHighLevelClient client = new RestHighLevelClient();

        String jsonString = "{" +
                "\"mappings\": {" +
                "\"properties\": {" +
                "\"title\": {\"type\": \"text\"}," +
                "\"content\": {\"type\": \"text\"}" +
                "}" +
                "}" +
                "}";

        CreateIndexRequest request = new CreateIndexRequest("my_index");
        request.source(jsonString, XContentType.JSON);

        try {
            CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
            System.out.println("Index created: " + createIndexResponse.isAcknowledged());
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            client.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}