should we use interactive prompts in logstash?

this relates to #3744 and #3404 where new interactive prompts were introduced.

interactive prompts are a potential problem for integration tests and for automation in general.

should we instead default to a "safe" behaviour and add an _override_ command line switch? (and choose a descriptive switch name for the context).

Start with related issues #3744 and #3404 to understand the existing interactive prompts and their context. Then review how integration tests and automation invoke Logstash; done means reaching agreement on the default behavior and the descriptive override switch before implementation.

Written by the indexing model from the issue text.