Laravel 7安装laravel/scout报错：“Your requirements could not be resolved to an installable set of packages.”处理方法之一

laravel中文网文档安装laravel/scout的方法是：
composer require laravel/scout

使用此方法报错：
Your requirements could not be resolved to an installable set of packages.

应该是scout版本过高，与我用的laravel7有什么冲突，使用低版本的scout即可安装:
composer require laravel/scout ~8.6.1