A scalar field is not initialized by the constructor

Defect 104978 (STATIC_C)
Checker UNINIT_CTOR (subcategory none)
File: /src/mongo/db/pipeline/document_source_merge_cursors.cpp
Function mongo::DocumentSourceMergeCursors::DocumentSourceMergeCursors(mongo::executor::TaskExecutor *, mongo::AsyncResultsMergerParams, const boost::intrusive_ptr<mongo::ExpressionContext> &, boost::optional<mongo::BSONObj>)
/src/mongo/db/pipeline/document_source_merge_cursors.h, line: 164
Class member declaration for "_execContext".

        RouterExecStage::ExecContext _execContext;

/src/mongo/db/pipeline/document_source_merge_cursors.cpp, line: 53
Non-static class member "_execContext" is not initialized in this constructor nor in any functions that it calls.

          _armParams(std::move(armParams)) {}