In the link you provided, Max@AWS mentions :
That said, one of the goals of the most current Amazon Linux AMI (2013.09) is to be as compatible as possible with RHEL 6.
The FAQ also mentions EPEL6
I would start off with RHEL6 and go from there. That post is pretty old so it may not be valid anymore though.
If RHEL6 doesn't work and you are using NXLog EE, you could try the generic RPM package.
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Thanks @Zhengshi. Would try that and let you know.