How to remove the name of 1 controller from the URL?

Question

Yii

We have, for example, 2 controllers SiteController and UserController, respectively, the url is obtained :
mysite.ru/site/index
mysite.ru/user/index
accessing mysite.ru/index to access SiteController
The config now says:

'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'enableStrictParsing' => true,
            'rules' => [
                [
                    'pattern' => '',
                    'route' => '',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<controller>/<action>/<id:\d+>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<controller>/<action>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<module>/<controller>/<action>/<id:\d+>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<module>/<controller>/<action>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],

            ],
        ],

Answer 1

'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'enableStrictParsing' => true,
            'rules' => [
                '/' => 'site/index',
                '/index' => 'site/index',
                [
                    'pattern' => '',
                    'route' => '',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<controller>/<action>/<id:\d+>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<controller>/<action>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<module>/<controller>/<action>/<id:\d+>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],
                [
                    'pattern' => '<module>/<controller>/<action>',
                    'route' => '<controller>/<action>',
                    'suffix' => '',
                ],

            ],
        ],