On the sum of eccentric subgraph numbers of the vertices of a connected graph

Let $G$ be a connected graph. The eccentric subgraph number $ε(v)$ of a vertex $v$ of $G$ is defined as $ε(v)=\min\{f_G(v,u): u\in V(G)\}$, where $f_G(v,u)$ is the number of connected subgraphs of $G$ containing both $v$ and $u$. The eccentric subgraph index $ES(G)$ of $G$ is defined as $ES(G)=\disp