hollow/src/main/java/com/netflix/hollow/core/write/objectmapper/HollowObjectMapper.java
@Deprecated
    public void writeFlat(Object o, FlatRecordWriter flatRecordWriter) {
    	HollowTypeMapper typeMapper = getTypeMapper(o.getClass(), null, null);
    	typeMapper.writeFlat(o, flatRecordWriter);
    }
@Deprecated
    public void writeFlat(Object o, FlatRecordWriter flatRecordWriter) {
    	HollowTypeMapper typeMapper = getTypeMapper(o.getClass(), null, null);
    	typeMapper.writeFlat(o, flatRecordWriter);
    }
Warning: Experimental.  the FlatRecord feature is subject to breaking changes.