star wars - Why are there so few familiar species in The Force Awakens?

I noticed that, in The Force Awakens, we see very few of the alien species we met in the other movies: there are

• no Twi'leks;


• no Rodians;


• no Transdoshans;


• no Hutts;


• no Gamorreans;


• no Ewoks;


• no Ithorians;


• none of the Mos Eisley Cantina aliens, like
  
  
  • the Aqualish (spider-face),
  
  
  • or Chadra-Fan (bat-person),
  
  
  • or Shistavanen (wolfman),
  
  
  • Devaronian (the demon),
  
  
  • or Duros;
  
  


• and no representatives of many other familiar species.

As far as I could tell, the only alien species in The Force Awakens that have been seen in previous films are:

• Humans (Han, Leia etc)


• Wookiees (Chewbacca)


• Mon Calamari (Ackbar)


• Whatever Nien Nunb is Sullustans (Nien Nunb)

However, we see many alien species in Maz' castle, so the problem isn't simply a lack of time and space for the appearance of familiar species of aliens.

Has anyone associated with the movie commented on this issue? Why did the producers decide to use new alien species to the exclusion of so many of the species we've come to know and love in episodes I-VI?