crm/protected/lib/ElasticSearch.php

<?php
namespace app\lib;
use Elastic\Elasticsearch\Client;
use Elastic\Elasticsearch\ClientBuilder;

class ElasticSearch
{
    private static $_conf = [];

    /**
     * @var Client
     */
    private static $_instance = null;

    private function __construct()
    {
    }

    /**
     * @return Client
     */
    public static function getInstance(): ?Client
    {
        if (null === self::$_instance)
        {
            self::$_conf = \Yii::app()->params['elasticsearch']['address']; // ES配置
            self::$_instance = ClientBuilder::create()
                ->setRetries(2)
                ->setHosts(self::$_conf)
                ->build();
        }

        return self::$_instance;
    }
}