use now() instead of fixed time

took me a few minutes to figure out why the doc i just added didn't show up in kibana. a more recent timestamp may be friendlier for beginners

Author: davidszotten

docs/index.rst

@@ -46,7 +46,7 @@ Example Usage
  doc = {
  'author': 'kimchy', 
  'text': 'Elasticsearch: cool. bonsai cool.', 
- 'timestamp': datetime(2010, 10, 10, 10, 10, 10)
+ 'timestamp': datetime.now(),
  }
  res = es.index(index="test-index", doc_type='tweet', id=1, body=doc)
  print(res['created'])