More options for elasticsearch config

[CvekCoding]

Description
I have a case when I need to tune some elastic client settings - my cloud provider require to use https (which is ok), but it uses self-signed ca-certificate. Default behavior of elasticsearch client to skip this type of connection. So I need to have a way to tune this connection.
I believe there are more cases when we need to have a way to fine tune elasticsearch client library. So I propose to add an options key to elastic config.
Example

# src/config/packages/api_platform.yaml
api_platform:
    elasticsearch:
        hosts: ['%env(ELASTICSEARCH_HOST)%']
        options:
            sslVerification: '%env(resolve:ELASTICSEARCH_CA_ROOT)%'

We need only a few changes to implement it. I can create a merge request for this.
WDYT?

[Xusifob]

+1 on this.

It would be nice to be able to pass a handler (such as https://github.com/jeskew/amazon-es-php) also, in order to use it in AWS for example.

[meyerbaptiste]

You can already do it now with a compiler pass.

For example with a handler:

// src/DependencyInjection/Compiler/ElasticsearchClientHandlerCompilerPass.php
namespace App\DependencyInjection\Compiler;

use Aws\ElasticsearchService\ElasticsearchPhpHandler;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Reference;

final class ElasticsearchClientHandlerCompilerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container): void
    {
        if (!$container->hasDefinition('api_platform.elasticsearch.client')) {
            return;
        }

        $clientDefinition = $container->getDefinition('api_platform.elasticsearch.client');

        [$factoryClass, $factoryMethod] = $clientDefinition->getFactory();

        if ('build' === $factoryMethod) {
            $clientDefinition->setFactory([$factoryClass, 'fromConfig']);
        }

        $clientConfiguration = $clientDefinition->getArguments()[0] ?? [];
        $clientConfiguration['Handler'] = new Reference(ElasticsearchPhpHandler::class);

        $clientDefinition->setArgument(0, $clientConfiguration);
    }
}

// src/Kernel.php
namespace App;

use App\DependencyInjection\Compiler\ElasticsearchClientHandlerCompilerPass;
use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\DependencyInjection\Compiler\PassConfig;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    // ...

    protected function build(ContainerBuilder $container): void
    {
        // priority is important here, it must be less than 0
        $container->addCompilerPass(new ElasticsearchClientHandlerCompilerPass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, -1);
    }
}