Uninitialized pointer field

The pointer field will point to an arbitrary memory location, any attempt to write may cause corruption. A pointer field is not initialized in the constructor
/src/mongo/db/index/s2_access_method.h:113: UNINIT_CTOR 144706 Class member declaration for "_collator".
/src/mongo/db/index/s2_access_method.cpp:98: UNINIT_CTOR 144706 Non-static class member "_collator" is not initialized in this constructor nor in any functions that it calls.