elasticsearch RestHighLevelClient 关于index的常用操作

对于索引的操作是基于***IndexRequest来进行操作的。例如：CreateIndexRequest、DeleteIndexRequest、GetIndexRequest

常见操作中还有校验索引是否存在：exists

创建连接请求：

　　

    private RestHighLevelClient client;

    //创建连接
    public ElasticsearchController() {
        RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("localhost" , 9200 , "http")
                )
        );

        this.client = restHighLevelClient;
    }

创建索引：

    public String createIndex(){

        //create es index
        CreateIndexRequest requestUser = new CreateIndexRequest("usertestinfo");
        CreateIndexResponse createIndexResponse = null;
        try {
            createIndexResponse = this.client.indices().create(requestUser, RequestOptions.DEFAULT);
        } catch (IOException e) {
            e.printStackTrace();
        }

        //get es index create result is true or false
        boolean acknowledged = false;
        try {
            acknowledged = createIndexResponse.isAcknowledged();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "Localhost Elasticsearch Create Index is1 : " + acknowledged;
    }

查找索引：

    public String findIndex(){

        GetIndexRequest request = new GetIndexRequest("user");
        HashMap<String, Object> result = new HashMap<>();
        try {
            GetIndexResponse getIndexResponse = this.client.indices().get(request, RequestOptions.DEFAULT);
            Map<String, Settings> settings = getIndexResponse.getSettings();

            System.out.println("index settings is :" + settings.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "find es index complete";
    }

删除索引：

    public String deleteIndex(){
        try {
            DeleteIndexRequest usertestinfo = new DeleteIndexRequest("user");
            AcknowledgedResponse delete = this.client.indices().delete(usertestinfo, RequestOptions.DEFAULT);
            System.out.println("delete index result is : " + delete.isAcknowledged());
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "delete es index complete";
    }

检验索引是否存在：

    //检验某条索引是否存在
    public String checkIndexIsExists(){

        GetIndexRequest request = new GetIndexRequest("user");
        boolean exists = false;
        try {
            exists = this.client.indices().exists(request , RequestOptions.DEFAULT);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "exists es index complete , result is :" + exists;
    }