The hipster cocktail crowd should prepare to shed a tear of small-batch gin into its well-chilled coupe glass: Singlebarrel -- the downtown bar that was a craft-cocktail pioneer in San Jose -- is going away in late May. Do not mourn too greatly, though, as owner Cache Bouren says he plans to open a cocktail bar with a new concept a few weeks later in the same basement space on First and San Salvador streets. Bouren says he opened the speakeasy-style bar in 2010 in part to educate customers about craft cocktails -- you know, those fancy cocktails handmade with fresh ingredients and high end spirits.