After nearly two decades in one of Nevada City’s most prominent locales at the corner of Pine and Broad streets, the owners of Indian Springs Tasting Room are preparing to close the doors of their wine-sipping hot spot in June. “Our customers are sad,” said Julie Holmes, who opened the tasting room 17 years ago with Dennis Ball. “I haven’t gotten through all the emails yet,” Holmes said. “I have pages and pages of costumers to respond to.” When those doors do shut this summer, they will effectively signify Indian Springs’ departure from Nevada County’s wine industry after exactly 30 …