Volume resize doesn’t be reflected in Kubernetes

I have being using an external volume for the ElasticSearch pod’s storage and I have a question about it:

• I did a resize to the volume but I don’t see the change reflected in the Kubernetes cluster, I don’t know if I need to do something else before to change the PVC configuration. On the volume’s options I can see that there is an option to manually mount it and also there is a guide about how to do it, but I think this is more related with the addition of new space. Is there a more simple way to do it?
• I have being trying to connect with the droplet remotely but it always fails, this is because it is a Kubernetes node and I don’s have a way to connect with it as I will normally do with a Linux’s virtual machine, or is there another way to connect and manage the volume?

I hope anybody can help me to understand better and how is the best way to do it and also if somebody can guide me to make snapshots into certain volumes. I would really appreciate it.