yxy/database/migrations/20230719211338_version201.php

<?php

use think\migration\Migrator;

class Version201 extends Migrator
{
    public function up(): void
    {
        $user = $this->table('user');
        if ($user->hasIndex('email')) {
            $user->removeIndexByName('email')
                ->removeIndexByName('mobile')
                ->update();
        }
    }
}