public Boolean removeRelation(String actorId, String targetId,
RelationshipKind kind) {
DirectoryService directoryService = Framework.getLocalService(DirectoryService.class);
Session relationshipDirectory = null;
try {
relationshipDirectory = directoryService.open(RELATIONSHIP_DIRECTORY_NAME);
Map<String, Serializable> filter = new HashMap<String, Serializable>();
filter.put(RELATIONSHIP_FIELD_ACTOR, actorId);
if (!StringUtils.isBlank(targetId)) {
filter.put(RELATIONSHIP_FIELD_TARGET, targetId);