

Yogthos, Cowbee etc. have given very detailed answers below. From what I know, the things they said are mostly correct. However, one point to note is that a very small minority of Uyghur people, who were influenced by fundamentalist Wahhabi teachings, carried out terrorist attacks against non-Uyghur people in the 2010s. So there was an atmosphere of fear and suspicion against all the Uyghurs, and many innocent people were subjected to searches, arrests, and so on. This has been documented by the UN. Of course, this is not dissimilar to the way Muslims were treated in France or the US after terrorist attacks. In fact, representatives from Muslim countries who visited Xinjiang praised the government’s response, as it included a lot of job creation and infrastructure projects to turn people away from extremism.
As far as I know, no one was forced to change their religion (Uyghurs aren’t even the biggest Muslim group in China, that’s the Hui) and there was no mass murder. I believe some innocent people who were wrongly suspected of being terrorists were strip-searched, particularly in the immediate aftermath of the attacks.