Golden Horde was Turkified Mongol Kingdom that exist in Central Asia while these Turks were living in Central Asian Land Mass Centuries before Mongol Invasion. They are called Kipchak Turks while those of their Turkish and Azeri Brethren are called Oghuz Turks and the only thing both groups shared is Language and culture rather then Heritage as those Turkish and Azeris are mostly Caucasian looking people. Those Hazaras in Afghanistan are Persion Stock among Mongol Army and meybe they were part of Another horde of Mongols which was located in present day Iran and Middle East.Turkic only by language. Uzbek Khan was head of Golden horde of Mongols. Racially Uzbeks are Turko-Mongols so were Timurids/Mughals or barlas. Hazaras on the other hand , are Persio-mongols with no established lines from heirs of genghis khan and with no established history. Point is, Uzbeks also have strong mongol features and no one in Afghanistan looks down upon them.
I heard that they were the Once who worked as Labours during British establishing Railway Infrastructure in Baluchistan. They came to Baluchistan after facing lot of Prosecution from Afghan Kingdom in fact that prosecution continued to the point that Genral Musa Khan even refused to met Zahir Shah during his Pakistan Visit in protest for prosecution of his Afghan Brethren in Afghanistan.Nope, the largest recruitment comes from Pashtuns of Baluchistan but yea Hazaras are recruiting in the army in large numbers since British times. It were British who settled them in Quetta in 1890s, but keep in mind a big potion of them arrived in Quetta in 1980s with other Afghan refugees. Qazi Muhammad Isa was hazara from mother side and Pashtun from father side. General Musa khan was a Hazara.