Delete index not working

[marcelloromani]

How to reproduce:

• Specify the --force_delete_index=True option
• Expected result: the index is deleted
• Actual result: a 400 Bad Request error is returned by Elasticsearch, the index is not deleted

Fix:

• Remove ?refresh=true from the url variable in function delete_index

-        url = "%s/%s?refresh=true" % (tornado.options.options.es_url, idx_name)
+        url = "%s/%s" % (tornado.options.options.es_url, idx_name)

[oliver006]

Thanks for submitting this issue!
I'll try to get to this at some point but I haven't used this project in quite a while so I'm a little rusty and it might take me a while.