title: Searchkick::ImportError while trying to reindex
body: <p>I am trying to implement elasticsearch on rails app using <code>searchkick</code> as the wrapper.</p>
  
  <p>I have a model called <strong>Article</strong> which hash <code>uuid</code> and <code>title</code> as columns</p>
  
  <p>I have added <code>searchkick</code> in Article model.</p>
  
  <p>Now when I am trying to run <code>Model.reindex</code> like stated in the searchkick documentation as follows:</p>
  
  <p><code>Article.reindex</code> from rails console</p>
  
  <p>I am getting the following error</p>
  
  <p><code>{"count":93,"exception":["Searchkick::ImportError","{\"type\"=\u003e\"mapper_parsing_exception\", \"reason\"=\u003e\"failed to find type parsed [keyword] for [title]\"} on item with id '003566ec-3952-4d26-ba99-f568367f174b'"],"exception_object":"{\"type\"=\u003e\"mapper_parsing_exception\", \"reason\"=\u003e\"failed to find type parsed [keyword] for [title]\"} on item with id '003566ec-3952-4d26-ba99-f568367f174b'"}
  Searchkick::ImportError: {"type"=&gt;"mapper_parsing_exception", "reason"=&gt;"failed to find type parsed [keyword] for [title]"} on item with id '003566ec-3952-4d26-ba99-f568367f174b'
  </code></p>
  
  <p>And yes elasticsearch service is up and running.</p>