Question

我正在创建将与我们的Java代码库集成的Elasticsearch集群。我想创建一个Elasticsearch索引并将SQL Query数据从多个数据库插入其中。来自所有数据库的查询结果应插入相同的索引中。为此，我正在使用Java高级Rest Client。但是我不太确定如何执行此操作，因为不赞成使用旧API中的许多方法。我也不太确定该如何处理createIndexResponse实例。有人可以帮我吗？

        public static void method_1(Connection con) throws Exception {

            Statement statement = con.createStatement();
            try {
                ResultSet result = statement.executeQuery("SELECT Field_1, Field_2, Field_3 from Table_1");
                int counter = 1;
                CreateIndexRequest createIndexRequest = new CreateIndexRequest("index_name");
                createIndexRequest.settings(new Settings.Builder()
                        .put("cluster.name", "my_cluster")
                        .put("http.enabled", true)
                        .put("node.data", true)
                        .put("index.number_of_shards", 3)
                        .put("index.number_of_replicas", 1)
                        .build());
                CreateIndexResponse createIndexResponse = ElasticSearch.eclient.indices().create(createIndexRequest, RequestOptions.DEFAULT);
                BulkRequest bulkRequest = new BulkRequest();
                while (result.next()) {
                    String field_1 = result.getString("Field_1");
                    int field_2 = result.getInt("Field_2");
                    String field_3 = result.getString("Field_3");
                    XContentBuilder builder = XContentFactory.jsonBuilder()
                            .startObject()
                            .field("Field 1", field_1)
                            .field("Field 2", field_2)
                            .field("Field 3", field_3)
                            .endObject();
                    UpdateRequest updateRequest = new UpdateRequest("index_name", "_doc", Integer.toString(counter));
                    updateRequest.doc(builder);
                    bulkRequest.add(updateRequest);
                }
                BulkResponse response = ElasticSearch.eclient.bulk(bulkRequest, RequestOptions.DEFAULT);
                if (response.hasFailures()) {
                    for (BulkItemResponse item : response.getItems()) {
                        System.out.println(item.getFailureMessage());
                    }
                }
                counter++;
                statement.close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }

Answer 1

您没有提供正在使用的版本。无论如何，我正在考虑您使用的是7.0.0。

我想这是一个可以的例子：

try (RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(HttpHost.create("http://localhost:9200")))) {
    CreateIndexRequest createIndexRequest = new CreateIndexRequest("index_name");
    createIndexRequest.settings(Settings.builder()
            .put("index.number_of_shards", 3)
            .put("index.number_of_replicas", 1)
            .build());
    client.indices().create(createIndexRequest, RequestOptions.DEFAULT);
    BulkRequest bulkRequest = new BulkRequest();
    XContentBuilder builder = XContentFactory.jsonBuilder()
            .startObject()
                .field("foo", "bar")
            .endObject();
    IndexRequest indexRequest = new IndexRequest("index_name");
    indexRequest.source(builder);
    bulkRequest.add(indexRequest);
    BulkResponse response = client.bulk(bulkRequest, RequestOptions.DEFAULT);
    if (response.hasFailures()) {
        for (BulkItemResponse item : response.getItems()) {
            System.out.println(item.getFailureMessage());
        }
    }
} catch (IOException e) {
    e.printStackTrace();
}

我建议使用BulkProcessor类，它更易于处理IMO。我有a full demo repository，我将在每个新发行版中进行更新。它也可能对您有帮助。

在使用Java高级其余客户端批量API创建动态Elasticsearch索引时需要帮助

1 个答案: