Select2, Your topic is similar to

Soo… i GUESSS maybe just maybe, the feature “Your topic is similar to…” that shows the topics on the right when we are make a new one here is made using select2? or its possible to make using select 2?

And if its not possible sry to make this topic but how is made?

(Sry im not good at English / and new to this dev thing hahaha just trying to learn for personal stuff…)
(Sry² if i should not make this topic here =/)