In MMS is typical to do this:
 
final Bson query =
eq(joinFields(POLICY_ASSIGNMENTS, PolicyAssignment.FieldDefs.SCOPE_FIELD), resourceId);
 
Where join fields, just concatenates them using String.join
 
public static String joinFields(final String... pFields)

 
Currently we don't detect the field name because we consider it calculated at runtime, but we could infer the name if we know that String.join is a pure function, so joinFields is also pure, and all parameters are final strings.