<?php

declare(strict_types=1);

/**
 * Copyright OpenSearch Contributors
 * SPDX-License-Identifier: Apache-2.0
 *
 * Elasticsearch PHP client
 *
 * @link      https://github.com/elastic/elasticsearch-php/
 * @copyright Copyright (c) Elasticsearch B.V (https://www.elastic.co)
 * @license   http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
 * @license   https://www.gnu.org/licenses/lgpl-2.1.html GNU Lesser General Public License, Version 2.1
 *
 * Licensed to Elasticsearch B.V under one or more agreements.
 * Elasticsearch B.V licenses this file to you under the Apache 2.0 License or
 * the GNU Lesser General Public License, Version 2.1, at your option.
 * See the LICENSE file in the project root for more information.
 */

namespace OpenSearch\Endpoints\Indices;

use OpenSearch\Endpoints\AbstractEndpoint;

class Upgrade extends AbstractEndpoint
{
    public function getURI(): string
    {
        $index = $this->index ?? null;

        if (isset($index)) {
            return "/$index/_upgrade";
        }
        return "/_upgrade";
    }

    public function getParamWhitelist(): array
    {
        return [
            'allow_no_indices',
            'expand_wildcards',
            'ignore_unavailable',
            'wait_for_completion',
            'only_ancient_segments'
        ];
    }

    public function getMethod(): string
    {
        return 'POST';
    }
}