DataDog/dd-agent — pull request #1010 by temujin9 (2014-06-27 23:09:04+00:00)
Title: ES metrics changed on or before 0.90.7, not 0.90.10

We run 0.90.7 clusters, which DD won't correctly show several ES stats for, with this code. With this correction applied, the stats show up as expected.

I'm not certain exactly when those changes came in, but they happened before 0.90.10. I don't have earlier versions to test with, unfortunately.