Was very impressed by the Cmd+K (Ctrl+K) feature for searching posts in the Ghost backend!! It comes in so useful when you want to search/edit posts.
I was wondering if there was a similar search option we could include in the front-end? Something as fast, and easy to use as the backend one? This would be great for readers who want to quickly find an article when browsing a site.
There’s a few ways to add search functionality, all with varying levels of control depending on how complex you’re willing to go:
https://www.ghostforbeginners.com/how-to-add-a-search-box-to-your-ghost-blog/
Search functionality on a site isn’t the most trivial feature to add, so it might be best to offload the task to another service 
For anyone looking for more options we’ve just added a tutorial on how to add search using Site Search 360:
https://ghost.org/tutorials/adding-search-to-a-ghost-theme/
Hope you find this useful 
I began a series of three blog posts to implement Elasticsearch into your Self-Hosted Docker Ghost blog.
Hoping this post will help you 