title: Searchkick reindex on heroku
body: <p>I keep getting this error when i deploy to heroku : </p>
  
  <pre><code> Searchkick::MissingIndexError in PostsController#search
  Index missing - run Post.reindex
  </code></pre>
  
  <p>It's working in development, but how do I reindex in production? Please include exact steps if possible. </p>
  
  <p>Here is my controller for the reference : </p>
  
  <pre><code>def search
      @posts = Post.search(params[:search])
  end
  </code></pre>