Question

在ElasticSearch 2.X中，当我想查询Java API中特定类型的特定字段时，我可以这样做：

  public List<String> getNames(String index, String type) {
    List<String> names = new ArrayList<>();
    SearchResponse scrollResp = client.prepareSearch()
        .setIndices(index)
        .setTypes(type)
        .addFields("my_name")
        .setQuery(QueryBuilders.matchAllQuery())
        .setSize(10).execute().actionGet();
    for (SearchHit hit : scrollResp.getHits().getHits()) {
      Map<String, SearchHitField> fields = hit.getFields();
      String name = fields.get("my_name").value();
      names.add(name);
    }
    return names;
  }

然而，在ES 5.0中，＆＃34; addFields＆＃34;方法消失了。有一些名为＆＃34; addStoredField＆＃34;。但是，如果您没有在映射中明确标记存储的字段，则这似乎不起作用。相反＆＃34; hit.getFields（）＆＃34;对于上面的代码，只返回一组空字段（fields.size（）== 0）。

如何为5.X获得与2.X相同的功能？也就是说，从结果中获取特定字段，而不显式存储它们。？

我在这里使用PreBuiltTransportClient作为客户端。

Answer 1

如果您使用if($_POST['submit']== 'Upload_picture') { //echo "<pre>"; print_r($_FILES['upload_picture']['name']); //die; $album_title = $_GET['name']; $album_id = $_GET['album']; $album_dir = "../images/album/$album_title/"; #album path root directory $db_album_dir = "images/album/$album_title/"; #batadase album path root directory $error = array(); $extension = array('jpg','gif','png','jpeg'); foreach($_FILES['upload_picture']['tmp_name'] as $key => $tmp_name){ $file_name = $_FILES['upload_picture']['name'][$key]; $file_tmp = $_FILES['upload_picture']['tmp_name'][$key]; $ext = pathinfo($file_name, PATHINFO_EXTENSION); $new_filename = rand().".".$ext; #changing name if(in_array($ext,$extension)) { if(move_uploaded_file($file_tmp= $_FILES['upload_picture']['tmp_name'][$key],"$album_dir$new_filename")) { # insert record database $values = [ 'album_id' =>$album_id, 'image_name' => $new_filename, 'album_name' => $album_title, 'image_path' => $db_album_dir.$new_filename, 'uploaded_date' => date("Y/m/d h:i:s a") ]; include_once "action_page.php"; $tablename = 'album_picture'; $abc = new Demo(); $res = $abc->insert($tablename,$values); unset($abc); $_SESSION['upload_success'] = "Files Uploaded succesfully"; header("location:../upload_album.php?album=$album_id&name=$album_title"); } else { $_SESSION['upload_error'] = "Something went wrong, files cannot be uploaded"; } } else { $_SESSION['upload_warning'] = "Please upload file"; header("location:../upload_album.php?album=$album_id&name=$album_title"); } }//EOF FROEACH方法定义您正在使用的字段，该怎么办：

.setFetchSource

您也可以查看此SO。

ElasticSearch 5.0 Java获取特定字段

1 个答案: