It's a patch applied to ensure consistency across platforms if we rely on the comment in the code. It's performed using this function:

Thanks for pointing that out, i commented out the line. Elasticsearch (in this case) would not accept the values otherwise.

The problem is that inet_ntop() is not consistent across all the platforms. The function above is used to patch issues to make test produce the same results on all platforms I am not an IPv6 expert so you should instruct me how to address this issue.