Update elasticsearch.py

The value for 'proxies', which was '2', should be a mapping, not an integer. Not sure why this was '2', but removing it seems to fix the problem.

Someone else also reported this issue here: https://github.com/ganglia/gmond_python_modules/issues/101
fixing in 2 othe places, too
Merge pull request #126 from avleen/elasticsearch

Update elasticsearch.py