Hmm, when I tried to import the o11nplugin-elasticservice-1.0.0-47.vmoapp into my vCO 5.1 server, I got an error:

HTTP ERROR 500

Problem accessing /elasticservice-config/Default.action. Reason:

    PWC6117: File "/WEB-INF/pages/configure.jsp" not found

Caused by:

org.apache.jasper.JasperException: PWC6117: File "/WEB-INF/pages/configure.jsp" not found

I had to click on the plug-in configuration again, then the page loaded properly.