Searchkick reindex on heroku

I keep getting this error when I deploy to heroku:

 Searchkick::MissingIndexError in PostsController#search
Index missing - run Post.reindex

      

        
        
        
      

    

It works in development, but how do I get re-indexed in production? Please provide the exact steps as needed.

Here is my controller for the link:

def search
    @posts = Post.search(params[:search])
end