How to operate on a directory with different owner from a script?

Few days ago i have installed elasticsearch, For diagnosing some problems on my elasticsearch setup, i have checked the logs files located in /var/log/elasticsearch and tailed them but apparently the directory's owner is elasticsearch and the group is elasticsearch, therefore i have resolved it by switching to root and apply the tail (not an elegant way). Now I would like to write a simple script to tail those files (I'm using tmux), Does anybody has a suggestion how to overcome the the privileges issue while using a script? I prefer keeping the ownership to elasticsearch user.