elasticsearch/elasticsearch-net — pull request #660 by gmarz (2014-05-14 00:00:12+00:00)
Title: Changed index size stats from ints to longs

Otherwise deserialization blows up on indices that exceed Int32.MaxValue in bytes, as you would expect.
This was pointed out here: http://stackoverflow.com/questions/23626384/elasticclient-an-error-when-checking-the-connection-status, which I was able to reproduce.