ElasticSearch JavaAPI RestClient未给出响应

Question

我正在使用RestClient JavaAPI从弹性搜索中获取文档。但是没有收到我的请求的回复。

正在使用形成我的请求QueryBuilder。

请找到我的Java代码，该代码用于从弹性搜索中获取文档

private final static String ATTACHMENT = "document_attachment";

private final static String TYPE = "doc";

static long BUFFER_SIZE = 520 * 1024 * 1024;   //  <---- set buffer to 120MB instead of 100MB

public static void main(String args[])

{

    RestClient restClient = null;

    Response contentSearchResponse=null;

    try {

    restClient = RestClient.builder(

                    new HttpHost("localhost", 9200, "http"),

                    new HttpHost("localhost", 9201, "http")).build();

    } catch (Exception e) {

        System.out.println(e.getMessage());

    }

    SearchRequest contentSearchRequest = new SearchRequest(ATTACHMENT); 

    SearchSourceBuilder contentSearchSourceBuilder = new SearchSourceBuilder();

    contentSearchRequest.types(TYPE);

    QueryBuilder attachmentQB = QueryBuilders.matchQuery("attachment.content", "activa");

    contentSearchSourceBuilder.query(attachmentQB);

    contentSearchSourceBuilder.size(50);

    contentSearchRequest.source(contentSearchSourceBuilder);

    System.out.println("Request --->"+contentSearchRequest.toString());

    Map<String, String> params = Collections.emptyMap();

    HttpEntity entity = new NStringEntity(contentSearchSourceBuilder.toString(), ContentType.APPLICATION_JSON);

    HttpAsyncResponseConsumerFactory.HeapBufferedResponseConsumerFactory consumerFactory =

            new HttpAsyncResponseConsumerFactory.HeapBufferedResponseConsumerFactory((int) BUFFER_SIZE);

    System.out.println("Printing Entity---->"+entity.toString());

    try {

        contentSearchResponse = restClient.performRequest("GET", "/document_attachment/doc/_search", params, entity, consumerFactory);

    } catch (IOException e1) {

        e1.printStackTrace();

    } 

    System.out.println("Entity Response --->"+contentSearchResponse.getEntity());

    }

请查找有关使用Sysout打印的我的“需求，实体和响应”的详细信息。