public static FieldsMappingOption useMapId(final String mapId) {
        return new FieldsMappingOption() {
            public void apply(DozerBuilder.FieldMappingBuilder fieldMappingBuilder) {
                fieldMappingBuilder.mapId(mapId);
            }
        };
    }
Mapping options applied on Field level.
core/src/main/java/com/github/dozermapper/core/loader/api/FieldsMappingOptions.java