elasticsearch 7.4.0

        <dependency>            <groupId>org.elasticsearch.client</groupId>            <artifactId>elasticsearch-rest-high-level-client</artifactId>            <version>7.4.0</version>        </dependency>

private void createIndex() throws IOException {
      RestHighLevelClient client = new RestHighLevelClient(                RestClient.builder(                        new HttpHost("localhost", 9200, "http")));        CreateIndexRequest request = new CreateIndexRequest("tweets_1");        request.settings(Settings.builder()                .put("index.number_of_shards", 1)                .put("index.number_of_replicas", 0)        );

        // 第一个字段message 类型text        Map<String, Object> message = new HashMap<>();        message.put("type", "text");        // 第二个字段content，类型text        Map<String, Object> content = new HashMap<>();        content.put("type", "text");        // 第三个字段title，类型keyword        Map<String, Object> title = new HashMap<>();        title.put("type", "keyword");        Map<String, Object> properties = new HashMap<>();        properties.put("message", message);        properties.put("content",content);        properties.put("title",title);        Map<String, Object> mapping = new HashMap<>();        mapping.put("properties", properties);        request.mapping(mapping);
        // 索引别名        request.alias(new Alias("tweets_search").filter(QueryBuilders.termQuery("name", "tz")));        request.setTimeout(TimeValue.timeValueMinutes(2));        request.setMasterTimeout(TimeValue.timeValueMinutes(1));        // 同步执行        CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);        // 响应        boolean acknowledged = createIndexResponse.isAcknowledged();        log.info("创建索引响应1：[{}]",acknowledged);        boolean shardsAcknowledged = createIndexResponse.isShardsAcknowledged();        log.info("创建索引响应2：[{}]",shardsAcknowledged);    }

public static final void createIndexTemp() throws IOException {RestHighLevelClient client = new RestHighLevelClient(                RestClient.builder(                        new HttpHost("localhost", 9200, "http")));            PutIndexTemplateRequest request = new PutIndexTemplateRequest("test_index_template");            List<String> indexPatterns = new ArrayList<String>();            indexPatterns.add("test*");            request.patterns(indexPatterns);
            /** mapping */            XContentBuilder jsonBuilder = XContentFactory.jsonBuilder()                    .startObject()                    .startObject("_source")                    .field("enabled", false)                    .endObject()
                    .startObject("properties")                    .startObject("hostname")                    .field("type", "keyword")                    .endObject()                    .startObject("gmtCreate")                    .field("type", "date")                    .field("format", "yyyy-MM-dd HH:mm:ss")                    .endObject()
                    .endObject()                    .endObject();

            request.mapping("_doc", jsonBuilder);
            Map<String, Object> settings = new HashMap<>();
            settings.put("number_of_shards", 1);            settings.put("number_of_replicas",0);            request.settings(settings);        AcknowledgedResponse acknowledgedResponse = client.indices().putTemplate(request, RequestOptions.DEFAULT);        log.info("创建索引模版返回:[{}]",acknowledgedResponse.isAcknowledged());
    }

https://github.com/TianPuJun/springboot-demo/tree/master/springboot-elasticsearch7