@Override
public Page<EsItem> recommend(List<String> itemIds, int page, int size) {
	Pageable pageable = PageRequest.of(page, size);
	String[] itemCatNames;
	if (itemIds.size() != 0) {
		List<EsItem> esItems = itemRepository.findByItemIdIn(itemIds);
		itemCatNames = esItems.stream().map(EsItem::getItemCatName).toArray(String[]::new);
	}
	else {
		itemCatNames = new String[] { "手机" };
	}
	System.out.println(Arrays.toString(itemCatNames));
	MoreLikeThisQueryBuilder moreLikeThisQueryBuilder = QueryBuilders
			.moreLikeThisQuery(new String[] { "itemCatName" }, itemCatNames, null).minTermFreq(1);
	NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
	nativeSearchQueryBuilder.withQuery(moreLikeThisQueryBuilder).withPageable(pageable)
			.withSort(SortBuilders.fieldSort("sale").order(SortOrder.DESC));
	NativeSearchQuery query = nativeSearchQueryBuilder.build();
	// return elasticsearchTemplate.queryForPage(query, EsItem.class);
	return itemRepository.search(query);
}
 

public MoreLikeThisQueryBuilder.Item buildMLTItem(String id) {
    return new MoreLikeThisQueryBuilder.Item(getIndexName(), getIndexType(), id);
}
 

protected MoreLikeThisQueryBuilder regMoreLikeThisQueryQ(String name, String[] likeTexts) {
    MoreLikeThisQueryBuilder moreLikeThisQuery = QueryBuilders.moreLikeThisQuery(new String[] { name }, likeTexts, null);
    regQ(moreLikeThisQuery);
    return moreLikeThisQuery;
}
 

protected MoreLikeThisQueryBuilder regMoreLikeThisQueryQ(String name, String[] likeTexts) {
    MoreLikeThisQueryBuilder moreLikeThisQuery = QueryBuilders.moreLikeThisQuery(new String[] { name }, likeTexts, null);
    regQ(moreLikeThisQuery);
    return moreLikeThisQuery;
}
 

protected MoreLikeThisQueryBuilder regMoreLikeThisQueryQ(String name, String[] likeTexts) {
    MoreLikeThisQueryBuilder moreLikeThisQuery = QueryBuilders.moreLikeThisQuery(new String[] { name }, likeTexts, null);
    regQ(moreLikeThisQuery);
    return moreLikeThisQuery;
}