Initializing docsearch does not always work

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When calling window.docsearch({...options}) the event listener is not caught on the input and the search does not work. Calling window.docsearch() a second time fixes the issue.
What we currently do is on the loading of the page we create and add to the DOM using javascript an input element, wait 1 second and then call window.docsearch()
This reproduce for some users and some users have it working properly.

If the current behavior is a bug, please provide all the steps to reproduce and a minimal
[JSFiddle][3] example or a repository on GitHub that we can npm install
and npm start.
https://github.com/Rookout/docs
You can `cd website && npm install && npm start` to start the website.
The relevant code is located at:
https://github.com/Rookout/docs/blob/master/website/static/js/rookoutCustom.js - line 52
https://github.com/Rookout/docs/blob/master/website/static/js/algoliaSearchRookout.js

What is the expected behavior?
I would expect to call window.docsearch() once and the search should work.

Start with website/static/js/rookoutCustom.js at line 52 and website/static/js/algoliaSearchRookout.js in the linked Rookout/docs reproduction; run cd website && npm install && npm start. Trace why the input listener is missed on the first window.docsearch({...options}) call, then verify that a single initialization makes search work.

Written by the indexing model from the issue text.