Not to take anything away from Celtic because that is an awesome win for them, but man oh man, I remember even just 6-8 years ago these Israeli teams were constantly making the Group Stage of the UCL. Now, they are on par (as a whole) with USL teams.
Edit: After looking at the data, the term "consistently" may be a slight exaggeration. They made 5 group stages from 2000 to 2010, whereas only 1 since then. Regardless, that league has weakened a lot with its UEFA coefficient falling to 26, smack between Serbia and Cyprus's league. In 2010, Israel's league was 17th. When they started it in 2001, Israel was 13th.