title: How to select specific fields in elasticsearch-dsl python
body: <p>I am using elasticsearch dsl to search on elasticsearch : <a href="https://elasticsearch-dsl.readthedocs.org/en/latest/" rel="noreferrer">https://elasticsearch-dsl.readthedocs.org/en/latest/</a></p>
  
  <p>How can i filter specific fields while making a search query:</p>
  
  <p>I know its supported in elasticsearch:
  <a href="https://www.elastic.co/guide/en/elasticsearch/reference/1.4/search-request-fields.html" rel="noreferrer">https://www.elastic.co/guide/en/elasticsearch/reference/1.4/search-request-fields.html</a></p>
  
  <p>Just dont know how to do the same in Elasticsearch-dsl</p>