.addSortExpression(SortExpression.newBuilder()
.setExpression("published")
.setDefaultValueDate(new Date())
.setDirection(SortDirection.DESCENDING)))
.build()).build(qstr);
Results<ScoredDocument> results = index.search(query);
// 対象のアクティビティを取得
List<ActivityModel> activityList = new ArrayList<ActivityModel>();
for (ScoredDocument document : results) {
String activityId = document.getId();