title: Creating a DocType class with a Integer field with elasticsearch-dsl
body: <p>I'd like to use the elasticsearch-dsl 0.0.9 librairy however their example are out of date.
  I installed the lastest version and the Integer and Boolean type do not exist anymore.</p>
  <p>Thus their example is not working.</p>
  <pre><code>from datetime import datetime
  #There is no 'Integer' in elasticsearch_dsl
  from elasticsearch_dsl import DocType, String, Date, Integer
  from elasticsearch_dsl.connections import connections
  
  # Define a default Elasticsearch client
  connections.create_connection(hosts=['localhost'])
  
  class Article(DocType):
      title = String(analyzer='snowball', fields={'raw': String(index='not_analyzed')})
      body = String(analyzer='snowball')
      tags = String(index='not_analyzed')
      published_from = Date()
      lines = Integer() ##############################   HERE
  </code></pre>
  <p>Would anyone know how to declare a Integer field?</p>
  <p>Thanks.</p>
  <h1>EDIT</h1>
  <p>According to this document <a href="https://media.readthedocs.org/pdf/elasticsearch-dsl/latest/elasticsearch-dsl.pdf" rel="nofollow noreferrer">https://media.readthedocs.org/pdf/elasticsearch-dsl/latest/elasticsearch-dsl.pdf</a> the Integer type should still be available in 0.0.9</p>
  <p>I dont know why it won't find it.</p>
  <p>As you can see from my pip output I did install the 0.0.9 : <code>Downloading elasticsearch_dsl-0.0.9-py2.py3-none-any.whl</code></p>