[Bug report] Pressing Enter on the documentation search result is broken

[hustcer]

Description

@vuepress/plugin-docsearch may has a bug:

1. open https://v2.vuepress.vuejs.org/
2. <Ctrl-K> or <Cmd-K>
3. Type some query (vite, for example)
4. Press <Enter>

will redirect to link https://v2.vuepress.vuejs.org/https:%2F%2Fvuepress.github.io%2Freference%2Fbundler%2Fvite.html which is a 404 page

Reproduction

Described above

Used Package Manager

npm

System Info

System:
    OS: macOS 12.4
    CPU: (8) x64 Intel(R) Core(TM) i5-8257U CPU @ 1.40GHz
    Memory: 79.48 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 14.19.0 - ~/Library/Caches/fnm_multishells/738_1660008898114/bin/node
    Yarn: 1.22.19 - ~/Library/pnpm/yarn
    npm: 6.14.17 - ~/Library/Caches/fnm_multishells/738_1660008898114/bin/npm
  Utilities:
    Git: 2.37.1 - /usr/local/bin/git
  Browsers:
    Chrome: 104.0.5112.79
    Edge: Not Found
    Firefox: Not Found
    Safari: 15.5
  npmPackages:
    @vuepress/bundler-vite:  2.0.0-beta.49
    @vuepress/bundler-webpack: Not Found
    @vuepress/cli:  2.0.0-beta.49
    @vuepress/client:  2.0.0-beta.49
    @vuepress/core:  2.0.0-beta.49
    @vuepress/markdown:  2.0.0-beta.49
    @vuepress/plugin-active-header-links:  2.0.0-beta.49
    @vuepress/plugin-back-to-top: ^2.0.0-beta.49 => 2.0.0-beta.49
    @vuepress/plugin-container:  2.0.0-beta.49
    @vuepress/plugin-docsearch: ^2.0.0-beta.49 => 2.0.0-beta.49
    @vuepress/plugin-external-link-icon:  2.0.0-beta.49
    @vuepress/plugin-git: ^2.0.0-beta.49 => 2.0.0-beta.49
    @vuepress/plugin-google-analytics: Not Found
    @vuepress/plugin-medium-zoom: ^2.0.0-beta.49 => 2.0.0-beta.49
    @vuepress/plugin-nprogress:  2.0.0-beta.49
    @vuepress/plugin-palette:  2.0.0-beta.49
    @vuepress/plugin-prismjs:  2.0.0-beta.49
    @vuepress/plugin-pwa: Not Found
    @vuepress/plugin-pwa-popup: Not Found
    @vuepress/plugin-register-components: Not Found
    @vuepress/plugin-search: Not Found
    @vuepress/plugin-shiki: Not Found
    @vuepress/plugin-theme-data:  2.0.0-beta.49
    @vuepress/plugin-toc: Not Found
    @vuepress/shared:  2.0.0-beta.49
    @vuepress/theme-default: ^2.0.0-beta.49 => 2.0.0-beta.49
    @vuepress/utils:  2.0.0-beta.49
    vue:  3.2.37
    vue-loader: Not Found
    vue-router:  4.1.2
    vuepress: ^2.0.0-beta.48 => 2.0.0-beta.49
    vuepress-vite:  undefined (2.0.0-beta.49)
    vuepress-webpack: Not Found