try (TransportClient client = createClientSingle()) {
//创建索引库 并执行
//admin()即admin对象;
//indices索引库管理;
//prepareCreate准备创建索引库"indexTest"
AcknowledgedResponse response = client.admin().indices().prepareDelete("indexTest").execute().actionGet();
return response.toString();
} catch (Exception e) {
e.printStackTrace();
return e.getMessage();
}