Remove ui plugin from core feature. 

features/org.eclipse.wst.server_core.feature.patch/feature.xml

diff --git a/features/org.eclipse.wst.server_core.feature.patch/feature.xml b/features/org.eclipse.wst.server_core.feature.patch/feature.xml
index a11b8e8..5154037 100644
--- a/features/org.eclipse.wst.server_core.feature.patch/feature.xml
+++ b/features/org.eclipse.wst.server_core.feature.patch/feature.xml
@@ -28,11 +28,4 @@
          version="0.0.0"
          unpack="false"/>
 
-   <plugin
-         id="org.eclipse.wst.server.ui"
-         download-size="0"
-         install-size="0"
-         version="0.0.0"
-         unpack="false"/>
-
 </feature>