In Zeppelin 0.7.3, when I create an Interpreter, I can give it a name like 'solr', but there is a drop-down for the interpreter group. In the screenshot it appears you can type one in... Have you tried this with 0.7.3?
Never mind, I think the install interpreter script was blowing up somehow (no error shown), so that is why no interpreter group. Tried again, and it worked.
In Zeppelin 0.7.3, when I create an Interpreter, I can give it a name like 'solr', but there is a drop-down for the interpreter group. In the screenshot it appears you can type one in... Have you tried this with 0.7.3?