How we thought it would work?

gistfile1.sbt

// Trait
trait EventLoggerComponent {

  val eventProcessor: EventProcessor

  trait EventLogger {

  }
}

// Context
class Context extends ... with ... with EventLoggerComponent {
  val processor: EventProcessor = // the real one
  new SearchService
}

// SearchService #1
trait SearchServiceComponent {
  class SearchService extends EventLogger {
  }
}