1.6.6 删除文档

删除文档如下：

DeleteResponse dresponse = client.prepareDelete("secilog"， "log"， "4").get();
boolean isFound = dresponse.isFound(); //文档存在返回true，不存在返回false

删除索引如下：

DeleteIndexRequest delete = new DeleteIndexRequest("secilog");
client.admin().indices().delete(delete);