我现在已经帮助自己创建了一个自定义ApiResource - filter

#[ApiFilter(FulltextFilter::class, arguments: ['index' => 'post'], properties: ['body','description','tag'])]

我的自定义过滤器实现了ApiPlatform\Core\Bridge\Doctrine\MongoDbOdm\Filter\FilterInterface，直接与ElasticSearch服务器通信，发送一个查询来搜索指定的索引（post），并向aggregationBuilder添加另一个match（）指令，其中包含一组与原始搜索匹配的ID：

<?php

declare(strict_types=1);

namespace App\Filter;

use ApiPlatform\Core\Bridge\Doctrine\MongoDbOdm\Filter\FilterInterface;
use Doctrine\ODM\MongoDB\Aggregation\Builder;
use Elastica\Result;
use Elastica\Client;
use Elastica\Query;
use Symfony\Component\PropertyInfo\Type;

/**
 * Filter the collection by given properties.
 *
 */
final class FulltextFilter implements FilterInterface
{
    protected $index = '';
    protected $properties = [];
    protected $client;
    protected $searchParameterName;
    protected $maxResultsParameterName;
    const DEFAULT_MAX_RESULTS = 200;
    public function __construct(Client $client, string $index = '', string $maxResultsParameterName = 'amount', string $searchParameterName = 'query', array $properties = []) {
        $this->index = $index;
        $this->properties = $properties;
        $this->client = $client;
        $this->searchParameterName = $searchParameterName;
        $this->maxResultsParameterName = $maxResultsParameterName;
    }
    public function getFilteredIds($searchterm, $index = null, $properties = null, $maxResults = null) {
        $matches = [];
        if (is_null($properties)) {
            $properties = array_keys($this->properties);
        }
        foreach ($properties as $propertyName) {
            array_push($matches, ['match'=>[$propertyName => $searchterm]]);
        }
        $queryObject = ['query' => ['bool' => ['should' => $matches]]];
        $queryObject['size'] = (int) $maxResults >0 ? (int) $maxResults : self::DEFAULT_MAX_RESULTS;

        $query = new Query();
        $response = $this->client->getIndex($index ?? $this->index)
            ->search($query->setRawQuery($queryObject))
            ->getResults();
        return array_map(function(Result $result) {return $result->getHit()['_source']['id'];}, $response);

    }

    public function apply(Builder $aggregationBuilder, string $resourceClass, string $operationName = null, array &$context = [])
    {
        $maxResults = $context['filters'][$this->maxResultsParameterName] ?? null;
        $searchterm = $context['filters'][$this->searchParameterName] ?? false;
        if ($searchterm !== false) {
            $aggregationBuilder->match()->field('id')->in($this->getFilteredIds($searchterm, null, null, $maxResults));
        }
    }

    public function getDescription(string $resourceClass): array
    {
        return [];
    }
}

这个解决方案可能不如使用api_platform本机提供的ElasticSearch-Connector那么优雅，但它的性能相当高，而且可以正常工作。
但是，如果有人提出解决方案来修复api_platform的ES-Connector问题，请随时与我们分享。

问题是，FOS Elastica需要一个带斜杠结尾的ES URL，而Api Platform需要一个不带斜杠结尾的URL。
我们通常在.env文件中定义URL，然后在配置文件中调用它。为了解决这个问题，我们可以在.env文件中定义URL，不使用斜杠结尾，然后将斜杠添加到FOS Elastica配置文件中。
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