Updated code.

To 5.1 and transitioning from 4.x to 5.x API was partian and
example did not work. Since change from use of NexusIndexer
to Indexer component, all results were empty, because while
deprecated NexusIndexer component kept references to all created
contexts and used it when request did not have one, the latter
does not keep references to them, hence, you always
explicitly have to set the context in request.