MoreLikeThis parsers SimpleMLTQParser and CloudMLTQParser - termvectors vs fieldvalues

It seems SimpleMLTQParser and CloudMLTQParser have one big difference.

SimpleMLTQParser uses term vectors of original item for searching more like this items, but CloudMLTQParser uses field values for this searching.

It means that if you don't have stored all values for the specified fields, then you search only by fields values from the stored fields. And this is a big problem. It's a breaking change for easy transfer from Solr standalone to Solr Cloud.

It would be better to have some mlt param to set up, if data should be read from field stored values or from the terms values.