Motivation

These two maps

  std::unordered_map<std::pair<const Elem *, unsigned short int>, const Elem *>
      _higher_d_elem_side_to_lower_d_elem;
  std::unordered_map<const Elem *, unsigned short int> _lower_d_elem_to_higher_d_elem_side;

are not rebuilt in the recovery mode. It will cause functions relying on the two maps not working properly.

Design

In MooseMesh::init() on the code path with recovery, we need to rebuilt the two maps.

Impact

Currently we have not hit this issue because we do not have recovery test that calling the functions in MooseMesh relying on these two maps.