context: With the adoption of Islam, the population of East Turkestan began to call themselves simply “Muslims” or “Türks,” identifying themselves by their Turkic origin and Muslim religion, as well as by the name of their ethnographic group (yurt) - Kashgarets, Dolan, Machin Taranches. For a long time, the common self-name was the colloquial yurlik “fellow countrymen” or “local” - a word sometimes found in our days, was used in the Uyghur environment to describe the Uyghur inhabitants of any of the oases. Despite the absence of a common ethnic self-name, the Uigurs were a formed medieval nation, recognizing the common origin and interests, having a common language, historical traditions, culture, Muslim faith; neighboring peoples also perceived different Uyghur yurts as a single nation, the Central Asian peoples called them Kashgars, the Mongols - Khotons, the Chinese - Chantou [7]. The country continued to be called Uygurstan or Uyguristan for a long time along with the names Mogulia and Kashgaria. This is noted by various sources; Muhammad Imin Sadr Kashgari in his work Asar al futuh (1790) called the country Uyguristan, which includes six cities [8].
question: When did the population of East Turkestan call themselves "Muslims"?
answers.text: With the adoption of Islam