https://github.com/10gen/mongo/blob/a87de9ca0dccea01fb99588aa437b1a8aa5c44e4/src/mongo/db/modules/enterprise/src/streams/exec/tests/s3_emit_operator_test.cpp#L254

This map can be concurrently accessed when the timing is right and can cause a segfault error. We should add a mutex to prevent concurrent access to avoid these test failures.