Is it required to close tunnel (DirectConnection) when connecting to remote server

Hi - In the example (Jump.java) we do not see that close method is called on tunnel (DirectConnection object), but we see that there is a close method available on this. Can you please let us know if this object has any resource to be released and so close must be called or is it fine to not invoke close on this object.
Ref: https://github.com/hierynomus/sshj/blob/master/examples/src/main/java/net/schmizz/sshj/examples/Jump.java

Regards,
Kaushal