Lambda formatting

private Map<Integer, ? extends Address> getAddressIndex(Optional<SubjectData> currentSubjectData) {
	return currentSubjectData
		.map(
			subjectData -> subjectData.getAddresses()
                                                  .stream()
                                                  .filter(address -> address.getEsoId() != null)
                                                  .collect(toMap(Address::getEsoId, t -> t))
		).orElse(
			emptyMap()
		);
}