NelmioApiDocBundle/Resources/config/api_platform.xml

<?xml version="1.0" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="nelmio_api_doc.describers.api_platform" class="Nelmio\ApiDocBundle\Describer\ApiPlatformDescriber" public="false">
            <argument type="service" id="nelmio_api_doc.describers.api_platform.openapi" />
            <argument type="service" id="api_platform.openapi.normalizer" />

            <tag name="nelmio_api_doc.describer" priority="-100" />
        </service>

        <service id="nelmio_api_doc.describers.api_platform.openapi" class="ApiPlatform\OpenApi\OpenApi" public="false">
            <factory service="api_platform.openapi.factory" method="__invoke" />
        </service>
        

    </services>

</container>