Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/3103
@Tagar Allow user to customize default interpreter make sense to me. Maybe
this ticket is a little misleading. Let me clarify if more. Here the property
`zeppelin.interpreter.default` is to set the default interpreter group when
user creating note. But user can still choose other interpreter group when
creating note.

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