“Baramulla,” a Hindi supernatural horror-thriller now streaming on Netflix, starts with a gripping premise set in a picturesque Kashmiri town where children begin to mysteriously disappear. DSP Ridwaan Sayyed (Manav Kaul) arrives with his family to investigate and is soon haunted by sinister forces in his new, creaky old house, which is tied to the traumatic exodus of the Kashmiri Pandits.