it can scroll ONLY whole scrollable list. not item. with item you need to use TOUCH actions like: start press down at point X and move to point Y. → http://appium.io/docs/en/writing-running-appium/touch-actions/
Also try to add “scrollable(true)” and use “resourceIdMatches” better:
“new UiScrollable(new UiSelector().resourceIdMatches(\"*.my_id\").scrollable(true)).setAsHorizontalList().scrollIntoView(new UiSelector().text(\"text\"))”