我有这样一个简单的实体：

<?php

namespace App\Entity\Creator;

use App\Repository\Creator\ActivityContactRepository;
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity(repositoryClass: ActivityContactRepository::class)]
#[ORM\Index(columns: ['contact_id'])]
class ActivityContact
{
    #[ORM\Id]
    #[ORM\ManyToOne(targetEntity: Activity::class, cascade: ['persist'])]
    private Activity $activity;

    #[ORM\Id]
    #[ORM\Column(name: 'contact_id', type: 'integer')]
    private int $contactId;

    public function __construct(Activity $activity, int $contactId)
    {
        $this->activity = $activity;
        $this->contactId = $contactId;
    }

    public function getActivity(): Activity
    {
        return $this->activity;
    }

    public function setActivity(Activity $activity): void
    {
        $this->activity = $activity;
    }

    public function getContactId(): int
    {
        return $this->contactId;
    }
}

当我生成一个"diff"迁移时，doctrine自动创建一个查询，为列"activity_id"添加一个MariaDB INDEX。
在我的例子中，这个索引没有用，我希望将其删除，而不仅仅是将其从迁移中删除。
是否有办法指定不创建此索引？
谢谢你，