Consider deprecating old services API

**Feature request**
It would be great to have search for controllers.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_search` with default `false`.

Reconcile the title about deprecating the old services API with the body’s request for controller search before starting. No files, tests, or entry points are named; locate the configuration handling and controller-related command path, then clarify how `enable_search` should affect behavior. Done should include an agreed scope, a default of `false`, and verification of controller search.

Written by the indexing model from the issue text.