Installing x-pack with nonstandard CONF_DIR

Elastic Stack Elasticsearch
3

Thanks,

This is what I have attempted:

export CONF_DIR=/etc/elasticsearch/node1
cd /usr/share/elasticsearch
sudo bin/elasticsearch-plugin install x-pack

returns:
bin/elasticsearch-plugin: line: 48 //etc/default/elasticsearch: Nos such file or directory
Unable to source environment file: //etc/defaul/elasticserach

setting the CONF_DIR and then executing sudo echo $CONF_DIR returns the value I set