We plan to expose the internalQueryForceClassicEngine setParameter to users in our documentation, which raises the question: should it be called internal?

Although we have told individual users about internal query knobs before, we have never actually exposed them in the docs. This parameter will be documented and also will likely be around for a long time, so it makes sense to reach a team consensus on the name. We could consider forceClassicEngine or forceClassicQueryEngine, or even going back to enableSlotBasedExecutionEngine.

Note that name changes cause confusion internally, so if we do decide to change it, we should do so as soon as possible, and I believe we should backport that change to v5.1 as well.