public List<Tag> findTags() {
List<Tag> tags = Lists.newArrayList();
TermsFacetBuilder facetBuilder = new TermsFacetBuilder("tags");
facetBuilder.field("tags").size(20);
facetBuilder.facetFilter(getNowDateFilter());
SearchResponse searchResponse = node.client().prepareSearch(INDEX).
setTypes(TYPE).
setQuery(QueryBuilders.matchAllQuery()).
setSize(0).