  The additional data necessary to univocally fix the gauge group for a given
algebra are represented by the same charge lattices of mutually local Wilson
and 't Hooft lines for both 4d $\mathcal{N}=4$ SYM and $\mathcal{N}=2$ elliptic
models. Motivated by this equivalence in this paper we study the Lens space
index of these $\mathcal{N}=2$ elliptic models. The index is indeed sensitive
to the global properties and in the $\mathcal{N}=4$ case it is expected to
coincide among S-dual models with different global properties, while it gives
different results for models that lie in other S-duality orbits. Here by an
explicit calculation we show that the same results hold for the $\mathcal{N}=2$
elliptic models as well.
