useful elastic search links

http://elasticsearch-py.readthedocs.org/en/master/api.html#elasticsearch

http://stackoverflow.com/questions/7999935/python-datetime-to-string-without-microsecond-component

http://joelabrahamsson.com/elasticsearch-101/

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-delete-by-query.html