MapStruct ignore automatically unmapped properties

For ignore automapping MapStruct 1.3.0.Final Reference Guide:

By means of the @BeanMapping(ignoreByDefault = true) the default behavior will be explicit mapping, meaning that all mappings have to be specified by means of the @Mapping and no warnings will be issued on missing target properties.

@BeanMapping(ignoreByDefault = true)
OneObj map(TwoObj two);

You can set the "unmapped target policy" on the @Mapper level or via @MapperConfig to share a setting across several mappers:

@Mapper(unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface MyMapper {}