title: mongo-connector failed to start with following error:
body: <p>The setup was running fine two days ago. Since then i had shutdown mongo connector and mongo-db was running in the background. But i hadn't run any query on mongo.</p>
  
  <p>Now i tried starting mongo-connector this morning and it failed to start.</p>
  
  <pre><code>viki@viki-pc:~/Documents/elasticSearch$ mongo-connector -m localhost:27017 -t localhost:9200 -d /usr/local/lib/python2.7/dist-packages/mongo_connector/doc_managers/elastic_doc_manager.py
  2014-12-08 11:43:49,870 - INFO - Beginning Mongo Connector
  Exception in thread Thread-1:
  Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
  self.run()
  File "/usr/local/lib/python2.7/dist-packages/mongo_connector/connector.py", line 284, in run
  self.read_oplog_progress()
  File "/usr/local/lib/python2.7/dist-packages/mongo_connector/connector.py", line 271, in read_oplog_progress
  if not isinstance(data[0], list):
  IndexError: list index out of range
  </code></pre>
  
  <p>I am trying to connect mongo with elastic search. And it was working fine 2 days ago.</p>