Nursing homes across Long Island have been hard hit by the coronavirus, with families becoming frantic and facilities closing themselves off to the outside world. The Amsterdam at Harborside, a continuing care retirement community in Port Washington, has experienced fewer cases than other places where Long Island’s elderly live. Still, life has changed. Episode 19 of “Life Under Coronavirus” is a visit inside the socially-distanced community, where resident Joan Rauch, 88, talks about happy hours of the past that are now replaced by Zoom classes, and other ways to stave off loneliness.