this is kinda correct, you won't be able to get it like that out of the box anymore in jessie stable, but you will be able to get it in unstable or by adding back ports to your system.
they think it's too insecure to include in stable.
they think it's too insecure to include in stable.
Sure it's not that there are known problems, but security isn't a thing you have or don't have; it's a process. If your process for identifying and fixing security flaws is broken, that's insecure.
Yes you will, it's just an old version without security updates.
> but you will be able to get it in unstable
No you won't, Stretch is the current unstable and elasticsearch is going to be removed from it.
elasticsearch will continue to remain in unstable