通过 Java API 在 Elastic Search 中创建索引答案

【问题标题】：Create index in Elastic Search by Java API通过 Java API 在 Elastic Search 中创建索引
【发布时间】：2020-03-03 06:00:15
【问题描述】：

我使用以下代码在 Elastic Search 中创建索引，默认 JAVA API：

Settings settings = ImmutableSettings.settingsBuilder().put("cluster.name", "myClusterName").put("client.transport.sniff", true).build();
Client client = new TransportClient(settings).addTransportAddress(new InetSocketTransportAddress("localhost", 9200));
CreateIndexRequestBuilder createIndexRequestBuilder = client.admin().indices().prepareCreate("test1");
CreateIndexResponse response = createIndexRequestBuilder.execute().actionGet();
System.out.println(response.isAcknowledged());

REST 服务：

HttpURLConnection con = null;
try
{
    String url = "http://localhost:9200/test2";

    URL resturl = new URL(url);
    con = (HttpURLConnection) resturl.openConnection();

    con.setDoOutput(true);
    con.setRequestMethod("PUT");
    BufferedReader in = null;
    try
    {
        if (con.getInputStream() != null)
        {
            in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        }
    }
    catch (IOException e)
    {
        if (con.getErrorStream() != null)
        {
            in = new BufferedReader(new InputStreamReader(con.getErrorStream()));
        }
    }
    if (in == null)
    {
        throw new Exception("Unable to read response from server");
    }
    StringBuffer decodedString = new StringBuffer();
    String line;
    while ((line = in.readLine()) != null)
    {
        decodedString.append(line);
    }
    in.close();
    System.out.println("4");
    Integer responseCode = con.getResponseCode();
    System.out.println(responseCode);
}
catch (Exception ex)
{
    ex.printStackTrace();
}
finally
{
    if (con != null)
    {
        con.disconnect();
    }
}

通过使用 REST API，我可以创建索引。默认情况下 JAVA API，我收到以下异常。

org.elasticsearch.client.transport.NoNodeAvailableException: No node available
at org.elasticsearch.client.transport.TransportClientNodesService.execute(TransportClientNodesService.java:202)
at org.elasticsearch.client.transport.support.InternalTransportIndicesAdminClient.execute(InternalTransportIndicesAdminClient.java:85)
at org.elasticsearch.client.support.AbstractIndicesAdminClient.create(AbstractIndicesAdminClient.java:200)
at org.elasticsearch.action.admin.indices.create.CreateIndexRequestBuilder.doExecute(CreateIndexRequestBuilder.java:206)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:62)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:57)
at ElasticSearch.createIndex(ElasticSearch.java:121)
at ElasticSearch.main(ElasticSearch.java:157)

请指导我在哪里出错。提前致谢

【问题讨论】：

标签： java elasticsearch

【解决方案1】：

TransportClient 的端口（通过 java API）与 Http 不同默认情况下，transportClient 端口为 9300

【讨论】：

感谢您的回答。我仍然遇到同样的异常。
现在可以正常使用了。我在使用 9300 时犯了一个小错误。但是在配置中我更新了端口号。

【解决方案2】：

使用副本和分片设置：

Settings indexSettings = ImmutableSettings.settingsBuilder()
                 .put("number_of_shards", 1)
                 .put("number_of_replicas", 1)
                 .build();
CreateIndexRequest indexRequest = new CreateIndexRequest(index, indexSettings);
client.admin().indices().create(indexRequest).actionGet();

【讨论】：

谢谢 :)，nb ：类 ImmutableSettings 已删除：对于较新的版本，请使用 Settings.builder()。欲了解更多信息：stackoverflow.com/questions/33115504/…

【解决方案3】：

既然你有你的客户，那么你不应该这样做吗：

CreateIndexResponse createResponse = client.admin().indices().create(createIndexRequest("test1")).actionGet();

【讨论】：

我只想补充一点，createIndexRequest 方法是 Requests.createIndexRequest("test1")

【解决方案4】：

使用 JAVA High-Level Rest Client 下面的代码可以用来创建索引。

 CreateIndexRequest request = new CreateIndexRequest("users");
        request.settings(Settings.builder()
                .put("index.number_of_shards", 3)
                .put("index.number_of_replicas", 2)
        );
        Map<String, Object> message = new HashMap<>();
        message.put("type", "text");   

        Map<String, Object> properties = new HashMap<>();
        properties.put("userId", message);
        properties.put("name", message);

        Map<String, Object> mapping = new HashMap<>();
        mapping.put("properties", properties);
        request.mapping(mapping);

        CreateIndexResponse indexResponse = client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println("response id: "+indexResponse.index());

如需进一步参考，请阅读： https://www.elastic.co/guide/en/elasticsearch/client/java-rest/master/java-rest-high-create-index.html#java-rest-high-create-index

【讨论】：