Christoph Büscher f4594d4302 Removing plugin that isn't installed shouldn't trigger usage information
The usage information for `elasticsearch-plugin` is quiet verbose and makes the
actual error message that is shown when trying to remove an non-existing plugin
hard to spot. This changes the error code to not trigger printing the usage
information.

Closes #21250
2016-11-04 11:46:20 +01:00
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