判断索引库是否存在

@SpringBootTest
public class MyTest{
    //注入RestHighLevelClient对象
    @Autowired
    private RestHighLevelClient restHighLevelClient;
    @Test
    public void test() throws IOException {
        //创建GetIndexRequest请求对象，并指定索引库名
        GetIndexRequest getIndexRequest = new GetIndexRequest(索引库名);
        //发送请求，得到响应
        boolean isExist = restHighLevelClient.indices().exists(getIndexRequest, RequestOptions.DEFAULT);
        //输出结果
        System.err.println(isExist ? "索引库已存在" : "索引库不存在");
    }
}