private boolean isGetMutableMap(ExecutableElement element) {
        return element.getSimpleName().toString().startsWith("getMutable") && isMapType(element.getReturnType());
    }
refer <a href="https://github.com/entur/mapstruct-spi-protobuf">mapstruct-spi-protobuf</a>
@author Arne Seime
commons-mapstruct-spi/src/main/java/com/navercorp/pinpoint/mapstruct/spi/ProtobufAccessorNamingStrategy.java