I have installed the Intellij Ultimate EAP below:
IntelliJ IDEA 2018.1 EAP (Ultimate Edition)
Build #IU-181.3870.7, built on February 20, 2018
IntelliJ IDEA EAP User
Expiration date: March 22, 2018
JRE: 1.8.0_152-release-1136-b11 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
I cannot find the Go plugin in any of the default repositories. There was a time when a custom repository was needed, but I never had this problem previous and was expecting to find it in the list.