SearchRequestBuilder srb = createSearchBuilder();
lastQ.initRequestBuilder(srb);
TermsFacetBuilder tfb = FacetBuilders.termsFacet(TAG).field(TAG);
if (!secPart.trim().isEmpty())
tfb.regex(secPart + ".*", Pattern.DOTALL);
srb.addFacet(tfb);
SearchResponse rsp = query(new ArrayList<JUser>(), srb.execute().actionGet());
Set<String> res = new TreeSet<String>();
TermsFacet tf = rsp.facets().facet(TAG);