如何在PHP中使用SQL AND条件进行ElasticSearch查询

我正在学习ElasticSearch通过以下这篇文章- https://qbox.io/blog/using-elasticsearch-in-e-commerce-part-1。指数,使用CURL命令创建elasticsearch的类型

curl -XPOST 'localhost:9200/ecomercedata/gadgets/_bulk?pretty' -d'
{ "index": { "_id": 1 }}
{ "name" : "MacBook Pro", "category" : "Laptop", "brand" : "Apple", "rating" : 9, "prize" :  1299.00, "piecesSold" : 9500,  "dateOfRelease" : "2005-02-01"}
{ "index": { "_id": 2 }}
{"name" : "MacBook Air",  "category" : "Laptop", "brand" : "Apple",  "rating" : 8,  "prize" :  1099.00,  "piecesSold" : 8700,   "dateOfRelease" : "2006-05-01"}
{ "index": { "_id": 3 }}
{"name" : "ATIV Book",  "category" : "Laptop",  "brand" : "Samsung",  "rating" : 8,  "prize" :  1899.00,  "piecesSold" : 3500,   "dateOfRelease" : "2014-05-01"}
{ "index": { "_id": 4 }}
{"name" : "Inspiron",  "category" : "Laptop",  "brand" : "Dell",  "rating" : 6,  "prize" :  700.00,  "piecesSold" : 4600,   "dateOfRelease" : "2008-03-01"}
{ "index": { "_id": 5 }}
{"name" : "Ipad",  "category" : "Tablet",  "brand" : "Apple",  "rating" : 9,  "prize" :  600.00,  "piecesSold" : 9500 ,  "dateOfRelease" : "2005-07-01"}
{ "index": { "_id": 6 }}
{"name" : "Galaxy Tab",  "category" : "Tablet",  "brand" : "Samsung",  "rating" : 8,  "prize" :  550.00,  "piecesSold" : 8500 ,  "dateOfRelease" : "2007-07-01"}
{ "index": { "_id": 7 }}
{"name" : "Lumia",  "category" : "Mobile",  "brand" : "Nokia",  "rating" : 6,  "prize" :  50.00,  "piecesSold" : 12000 ,  "dateOfRelease" : "2009-03-01"}
{ "index": { "_id": 8 }}
{"name" : "Iphone",  "category" : "Mobile", "brand" : "Apple",  "rating" : 8,  "prize" :  60.00,  "piecesSold" : 28000 ,  "dateOfRelease" : "2002-03-01"}
{ "index": { "_id": 9 }}
{"name" : "Xperia",  "category" : "Mobile",  "brand" : "Sony",  "rating" : 8,  "prize" :  70.00,  "piecesSold" : 24000 ,  "dateOfRelease" : "2004-03-01"}'

字段映射使用的脚本-

curl -X PUT "http://localhost:9200/ecomercedata/gadgets/_mapping" -d '{
  "gadgets" : {
    "properties" : {
      "category" : {
        "type" : "String",
    "index" : "not_analyzed"
      },
      "brand" : {
        "type" : "String",
    "index" : "not_analyzed"
      },
      "name" : {
        "type" : "String"
      },
      "rating" : {
        "type" : "Integer"
      },
      "dateOfRelease" : {
        "type" : "date",
        "format" : "YYYY-mm-dd"
      },
      "prize" :  {
        "type" : "Double"
      },
      "piecesSold" : {
        "type" : "Integer"
      }
    }
  }
}'

我使用php从ElasticSearch获取记录。下面是我的PHP脚本。

<?php
require 'vendor/autoload.php';
$hosts = [
    'http://localhost:9200',        // SSL to localhost
];
$client = Elasticsearch'ClientBuilder::create()     // Instantiate a new ClientBuilder
                    ->setHosts($hosts)              // Set the hosts
                    ->build();
$params = [
            'index' => 'ecomercedata',
            'type' => 'gadgets',
            'body' => [
                'query' => [
                        'constant_score' => [
                            'filter' => [
                                'bool' => [
                                    'must' => [
                                        'term' => [
                                            'category' => 'Laptop'
                                        ],
                                        'term' => [
                                            'brand' => 'Apple'
                                        ]
                                    ]
                                ]
                            ]
                        ]
                ]
            ]
        ];
try {
    $results = $client->search($params);
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "'n";
    exit;
}
echo '<pre>';
print_r($results);
echo '</pre>';
?>

基本上，我试图提取所有记录，其中category=laptop and brand=Apple。但是，它没有给我正确的记录数。根据输入的数据集，我应该得到2条记录，但我得到4条记录。看起来，category and brand的工作方式类似于OR，而不是AND。

我用谷歌搜索了很多。但是，我不知道我做错了什么。