How to search in search box with select its first option

I am entering the name which is I want to search then it is displayed auto suggestion, but I am not able to select the first option from autosuggestion.

This is eclipse oxygen with TestNG plugin

driver.findElement(By.className("searchfilter")).sendKeys("Abilify");// This is working But after that option selection is not working

driver.findElement(By.cssSelector(".list-group-item:first-child")).click(); // Issue is here

Html code:

<li class="list-group-item list-group-item-action py-3 tabindex fs-1-1 bg-offwhite" id="indexTab1" href="970-ABILIFY" name="ABILIFY - ARIPIPRAZOLE">ABILIFY - ARIPIPRAZOLE</li>