facet【聚類】，在elacticsearch搜尋結果的基礎上，對某個字段按照內容的不同進行分類統計。
package bio_rdf.impl.fieldfacet;
import org.elasticsearch.action.search.searchrequestbuilder;
import org.elasticsearch.action.search.searchresponse;
import org.elasticsearch.action.search.searchtype;
import org.elasticsearch.client.client;
import org.elasticsearch.client.transport.transportclient;
import org.elasticsearch.common.settings.immutablesettings;
import org.elasticsearch.common.settings.settings;
import org.elasticsearch.common.transport.inetsockettransportaddress;
import org.elasticsearch.index.query.querybuilder;
import org.elasticsearch.index.query.querybuilders;
import org.elasticsearch.index.query.querystringquerybuilder;
import org.elasticsearch.search.facet.facetbuilders;
import org.elasticsearch.search.facet.terms.termsfacet;
//public class esfieldfacet
client.close();
}}
result：
--------------start------------------
fusobacterium nucleatum subsp. vincentii atcc 49256
302---------------end-----------------
相反，當elasticsearch對organism進行解析的時候，結果就是下面的內容【因為當es對欄位進行解析的時候，首先呼叫standard解析器，先把字段按照一定格式分隔，然後再將大寫字母變為小寫，變成了「一袋子」單詞】
--------------start------------------
vincentii
302---------------end-----------------
--------------start------------------
subsp
302---------------end-----------------
--------------start------------------
nucleatum
302---------------end-----------------
--------------start------------------
fusobacterium
302---------------end-----------------
--------------start------------------
atcc49256
302---------------end-----------------
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