ConnectionManager.php

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<?php
namespace Magento\Elasticsearch\SearchAdapter;

use Magento\AdvancedSearch\Model\Client\ClientOptionsInterface;
use Magento\AdvancedSearch\Model\Client\ClientFactoryInterface;
use Magento\Elasticsearch\Model\Client\Elasticsearch;
use Psr\Log\LoggerInterface;

class ConnectionManager
{
    protected $client;

    protected $logger;

    protected $clientFactory;

    protected $clientConfig;

    public function __construct(
        ClientFactoryInterface $clientFactory,
        ClientOptionsInterface $clientConfig,
        LoggerInterface $logger
    ) {
        $this->logger = $logger;
        $this->clientFactory = $clientFactory;
        $this->clientConfig = $clientConfig;
    }

    public function getConnection($options = [])
    {
        if (!$this->client) {
            $this->connect($options);
        }

        return $this->client;
    }

    private function connect($options)
    {
        try {
            $this->client = $this->clientFactory->create($this->clientConfig->prepareClientOptions($options));
        } catch (\Exception $e) {
            $this->logger->critical($e);
            throw new \RuntimeException('Elasticsearch client is not set.');
        }
    }
}