title: NEST - IndexMany doesn't index my objects
body: <p>I've used NEST for elasticsearch for a while now and up until now I've used the regular ElasticSearchClient.Index(...) function, but now I want to index many items in a bulk operation. </p>
  
  <p>I found the IndexMany(...) function, but I must do something wrong because nothing is added to the elastic search database as it does with the regular Index(...) function?</p>
  
  <p>Does anyone have any idea?</p>
  
  <p>Thanks in advance!</p>