It's really not as common as with CUCM the need to install a ES or upgrade in Unity.
If your system has been running fine so far i don't believe you need any ES. Installing ES just because can cause trouble because some need to be installed in pairs, or installing a ES causes another bug for which you need yet, another ES to fix. Unless you have been instructed by TAC or know you're hitting a bug best to leave them alone.
HTH
java
if this helps, please rate
HTH
java
if this helps, please rate