Trigger a full import of every document under `path` for an existing GED connexion. Plain one-off import by default (unchanged behavior). If `schedules` is provided, also creates/updates the DocumentSourceSync target for this source+path (with its whole schedule set replaced by what's submitted) and runs the first sync through it instead — reusing the same root folder incrementally on every later scheduled run. Creating documents is admin/integrator-only — see require_document_org_manager.