Github user sanjaydasgupta commented on the issue:
https://github.com/apache/zeppelin/pull/2834
I have added code, documentation, and configuration-template files for a
single environment-variable named `ZEPPELIN_INTERPRETER_INTERPOLATION` (and a
corresponding java-property `zeppelin.interpreter.interpolation`) for globally
enabling/disabling interpolation.
The feature is disabled by default, guaranteeing backward-compatibility for
existing code, while allowing users who want the feature to switch it on when
needed.
As suggested by @zjffdu above, more fine-grained configuration can be added
in future when the paragraph-level configuration becomes available in 0.9.0.
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