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Here is an example of how to create a RESTful API with Elasticsearch using the PHP Laravel framework:

First, you’ll need to install Elasticsearch on your server, and make sure it’s running.
Next, you’ll need to install the Elasticsearch PHP client library by running the following command in your terminal:

composer require elasticsearch/elasticsearch

In your Laravel project, create a new controller for your API endpoint. For example, you might create a SearchController that handles all of your Elasticsearch queries.
In the SearchController, use the Elasticsearch PHP client to interact with your Elasticsearch cluster. For example, you might create a search() method that takes a query string as a parameter, and then uses the client to search your Elasticsearch index for matching documents.

use Elasticsearch\ClientBuilder;

class SearchController extends Controller
{
    public function search($query)
    {
        $client = ClientBuilder::create()->build();

        $params = [
            'index' => 'my_index',
            'type' => 'my_type',
            'body' => [
                'query' => [
                    'match' => [
                        'title' => $query
                    ]
                ]
            ]
        ];

        $response = $client->search($params);
        return $response;
    }
}

In your routes/web.php or routes/api.php file, create a new route that maps to the search() method in your SearchController.

Route::get('search/{query}', 'SearchController@search');

This is a simple example, but you can customize it to suit your needs. You can also use other Elasticsearch features like pagination, sorting, and filtering.

Please note that this is just a sample code, and you may need to make some adjustments to match your specific Elasticsearch setup and your requirements. Also, you should consider security and performance issues when building a production-ready RESTful API with Elasticsearch.

Set domain name

Here is an example of how to configure the Elasticsearch PHP client to connect to an Elasticsearch cluster using a domain name:

use Elasticsearch\ClientBuilder;

class SearchController extends Controller
{
    public function search($query)
    {
        $client = ClientBuilder::create()
            ->setHosts(["https://my-elasticsearch-domain.com"])
            ->build();

        $params = [
            'index' => 'my_index',
            'type' => 'my_type',
            'body' => [
                'query' => [
                    'match' => [
                        'title' => $query
                    ]
                ]
            ]
        ];

        $response = $client->search($params);
        return $response;
    }
}

This code sets the host for the client to the domain name of your Elasticsearch cluster.

Here the client is set to use HTTPS, if you’re using Elasticsearch on a non-default port or if your Elasticsearch cluster is running on HTTP instead of HTTPS, you can specify the port number in the host string like this:

->setHosts(["http://my-elasticsearch-domain.com:9200"])

You can also set multiple hosts if you have a cluster of Elasticsearch nodes to connect to. This is useful if you want to connect to multiple nodes in case of node failure.

->setHosts(["https://my-elasticsearch-domain1.com","https://my-elasticsearch-domain2.com"])

Using secret token

Here is an example of how to create a new Elasticsearch index using the PHP Laravel framework and a secret token passed in by the client:

In your SearchController create a method for creating the index, for example createIndex().

use Elasticsearch\ClientBuilder;

class SearchController extends Controller
{
    public function createIndex(Request $request)
    {
        // Verify the secret token passed in by the client
        $secret = $request->input('secret');
        if ($secret != 'mysecret') {
            return response()->json(['error' => 'Invalid secret token'], 401);
        }

        $client = ClientBuilder::create()
            ->setHosts(["https://my-elasticsearch-domain.com"])
            ->build();

        $params = [
            'index' => 'my_new_index',
            'body' => [
                'settings' => [
                    'number_of_shards' => 3,
                    'number_of_replicas' => 2
                ]
            ]
        ];

        $response = $client->indices()->create($params);
        return response()->json($response);
    }
}

In your routes/web.php or routes/api.php file, create a new route that maps to the createIndex() method in your SearchController.

Route::post('create-index', 'SearchController@createIndex');

On the client side, when making the request to create the index, include the secret token in the request body.

fetch('/create-index', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({secret: 'mysecret'}),
})
.then(response => response.json())
.then(data => {
  console.log('Success:', data);
})
.catch((error) => {
  console.error('Error:', error);
});

This is a simple example, but you can customize it to suit your needs. You can also add validation for the request body before creating the index.