最后在国外的网站找到了答案。原来elasticsearch php的类的文件夹变化了。打开ClientBuilder.php，可以看见内容为：
namespace Elastic\Elasticsearch;
use Elastic\Elasticsearch\Exception\AuthenticationException;
use Elastic\Elasticsearch\Exception\ConfigException;
use Elastic\Elasticsearch\Exception\HttpClientException;
use Elastic\Elasticsearch\Exception\InvalidArgumentException;
全部都是在Elastic这个文件夹内。所以我们将代码修改为
require 'vendor/autoload.php';
use Elastic\Elasticsearch\ClientBuilder;
$builder = Elastic\Elasticsearch\ClientBuilder::create();
$builder->setHosts(array("127.0.0.1:9200"));
$client = $builder->build();
就能够正确地调用class了。
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