Question: In what year was the album Clockwork Indigo released which featured both The Underachievers and American Hip Hop group Flatbush  Zombies?

Context articles: Erick Arc Elliott
Clockwork Indigo EP
Overdoz
Lords Never Worry
Cozy Tapes Vol. 2: Too Cozy
Flatbush Zombies
The Underachievers
Extended Play (Statik Selektah album)
3001: A Laced Odyssey
Zombie Juice

Erick Elliott (born August 12, 1988), better known as Erick Arc Elliott or Erick the Architect, is an American rapper and record producer of Jamaican descent from Brooklyn, New York.
 A third of the hip hop trio, Flatbush ZOMBiES, Elliot has also released several solo projects.
Clockwork Indigo is the self-titled EP by American hip hop group Clockwork Indigo (consisting of Hip hop groups Flatbush Zombies and The Underachievers).
 It was released on October 17, 2014 under Electric KooLade Records.
Overdoz (stylized as OverDoz.)
 is an American hip hop group from the Crenshaw District of Los Angeles, California.
 The group is composed of vocalist and rapper Kent Jamz, rapper Joon, rapper P and comedian Cream.
 The group formed in the summer of 2008 and are currently signed to RCA Records and Polo Grounds Music.
 Overdoz has collaborated with several prominent artists in the hip hop industry, such as Kendrick Lamar, Pharrell Williams, A$AP Rocky, A$AP Ferg, Childish Gambino, Juicy J, The Internet, Flatbush Zombies, Dom Kennedy, Casey Veggies, and Skeme.
Lords Never Worry (stylized as Lord$ Never Worry) is the debut mixtape by hip hop collective ASAP Mob.
 It was released as a free digital download on August 28, 2012, by ASAP Worldwide, Polo Grounds Music and RCA Records.
 The mixtape contains verses from ASAP Mob group members of ASAP Rocky, ASAP Twelvyy, ASAP Ant, ASAP Ferg, ASAP Nast and Dash, along with guest appearances from Danny Brown, Raekwon, Flatbush Zombies, Gunplay, Fat Trel, Jim Jones and Bodega Bamz; as well as the production that was provided by Clams Casino, ASAP Ty Beats, AraabMuzik and P On The Boards, among others.
Cozy Tapes Vol.
 2: Too Cozy is the second studio album by American hip hop collective ASAP Mob.
 It was released on August 25, 2017, by ASAP Worldwide, Polo Grounds Music and RCA Records.
 The album features guest appearances from Big Sean, Playboi Carti, Pro Era, Quavo, Lil Uzi Vert, Lil Yachty, Chief Keef, Gucci Mane, Schoolboy Q, Frank Ocean, Jaden Smith, Smooky Margielaa and Flatbush Zombies.
 It was preceded by two singles, "RAF" featuring ASAP Rocky, Playboi Carti, Quavo, Lil Uzi Vert and Frank Ocean, and "Feels So Good" featuring ASAP Rocky, ASAP Ferg, ASAP Nast, ASAP Twelvyy and ASAP Ant.
Flatbush Zombies (stylized as Flatbush ZOMBiES) is an American hip hop group from the Flatbush section of Brooklyn, New York City, formed in 2010.
 The group is composed of rappers Meechy Darko, Zombie Juice and Erick Arc Elliott, the latter of whom also serves as their regular record producer.
 The trio are part of the East Coast hip hop movement known as "Beast Coast", which also consists of fellow Brooklyn-based rap groups The Underachievers and Pro Era.
The Underachievers are an American hip hop duo from Flatbush, Brooklyn, New York.
 Formed in 2011, the duo is composed of rappers AKTHESAVIOR and Issa Gold.
 American record producer Flying Lotus signed the duo to his Brainfeeder record label in 2012.
 Following that signing they independently released two mixtapes, "Indigoism" and "Lords of Flatbush" in 2013.
 Their debut studio album "" was released on August 12, 2014.
 The Underachievers released their second official album "" on September 25, 2015.
 Their third album, Renaissance was released on May 19, 2017.
Extended Play is the fifth studio album by East Coast hip hop producer Statik Selektah.
 The album was released on June 18, 2013, by Duck Down Music Inc. and Showoff Records.
 The album features guest appearances from Action Bronson, Tony Touch, Raekwon, Joey Badass, Black Thought, N.O.R.E., Sean Price, Mac Miller, Mike Posner, Freddie Gibbs, Prodigy, Styles P, Bun B, Hit-Boy, Joell Ortiz, Evidence, Lecrae, Talib Kweli, and Flatbush Zombies among others.
3001: A Laced Odyssey is the debut studio album by the American hip hop group Flatbush Zombies.
 The album was released on March 11, 2016, through their own independent record label, Glorious Dead Recordings & Warner Music's ADA.
Antonio Lewis, better known by his stage name Zombie Juice, is an American rapper from Brooklyn, New York.
 He is one third of the hip hop trio Flatbush ZOMBiES.
 Along with his rapping career, Lewis also directed a music video for the Flatbush Zombies song "Thugnificense".