Elasticsearch 入门实战(5)--Java API Client 使用一(Index,Document,Ingest,SQL APIs)

本文主要介绍 Elasticsearch Java API Client 的使用，相关的环境及软件信息如下：CentOS 7.6.1810、Java 1.8.0_341(客户端用)、Elasticsearch 8.13.4、elasticsearch-java 8.13.4。

1、Java API Client 的特点

Strongly typed requests and responses for all Elasticsearch APIs.
Blocking and asynchronous versions of all APIs.
Use of fluent builders and functional patterns to allow writing concise yet readable code when creating complex nested structures.
Seamless integration of application classes by using an object mapper such as Jackson or any JSON-B implementation.
Delegates protocol handling to an http client such as the Java Low Level REST Client that takes care of all transport-level concerns: HTTP connection pooling, retries, node discovery, and so on.

2、引入依赖

<dependency>
    <groupId>co.elastic.clients</groupId>
    <artifactId>elasticsearch-java</artifactId>
    <version>8.13.4</version>
</dependency>

3、使用

Elasticsearch Java API Client 通过 API 的方式来组装请求数据，避免直接编写 JSON 字符串；请求数据的详细说明可参考：Elasticsearch 入门实战(3)--REST API 使用。

3.1、连接及关闭

Java API Client 底层依赖 Java Low Level REST Client，需先创建 Low Level REST Client。

private ElasticsearchTransport transport;
private ElasticsearchClient client;

@Before
public void before() {
    RestClient restClient = RestClient.builder(
            new HttpHost("10.49.196.10", 9200),
            new HttpHost("10.49.196.11", 9200),
            new HttpHost("10.49.196.12", 9200)).build();
    ObjectMapper objectMapper = new ObjectMapper();
    transport = new RestClientTransport(restClient, new JacksonJsonpMapper(objectMapper));
    client = new ElasticsearchClient(transport);
}

@After
public void after() throws IOException {
    client.shutdown();
}

3.2、Index APIs

3.2.1、Create index API(创建索引)

/**
 * 创建索引
 */
@Test
public void createIndex() throws IOException {
    CreateIndexResponse response = client.indices().create(builder -> builder
            .settings(indexSettingsBuilder -> indexSettingsBuilder.numberOfReplicas("1").numberOfShards("2"))
            .mappings(typeMappingBuilder -> typeMappingBuilder
                    .properties("age", propertyBuilder -> propertyBuilder.integer(integerNumberPropertyBuilder -> integerNumberPropertyBuilder))
                    .properties("name", propertyBuilder -> propertyBuilder.keyword(keywordPropertyBuilder -> keywordPropertyBuilder))
                    .properties("poems", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_smart")))
                    .properties("about", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_smart")))
                    .properties("success", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_smart")))
            )
            .index(INDEX_NAME));
    log.info("response={}", response);
}

3.2.2、Delete index API(删除索引)

/**
 * 删除索引
 */
@Test
public void deleteIndex() throws IOException {
    DeleteIndexResponse response = client.indices().delete(builder -> builder.index(INDEX_NAME));
    log.info("response={}", response);
}

3.2.3、Get index API(查看索引信息)

/**
 * 查询索引
 */
@Test
public void getIndex() throws IOException {
    //查询所有索引，也可以使用 *
    GetIndexResponse response = client.indices().get(builder -> builder.index("_all"));
    log.info("response={}", response);

    response = client.indices().get(builder -> builder.index(INDEX_NAME));//单个索引
    log.info("response={}", response);
}

3.2.4、Get mapping API(查询 mapping 信息)

/**
 * 查询 mapping 信息
 */
@Test
public void getMapping() throws IOException {
    //查询所有字段信息
    GetMappingResponse response = client.indices().getMapping(builder -> builder.index(INDEX_NAME));
    log.info("response={}", response);

    //查询某些字段信息
    GetFieldMappingResponse response2 = client.indices().getFieldMapping(builder -> builder.index(INDEX_NAME).fields("age"));
    log.info("response2={}", response2);
}

3.2.5、Update mapping API(修改 mapping 信息)

/**
 * 修改 mapping 信息
 * 可以新增字段，已有字段只能修改字段的 search_analyzer 属性
 */
@Test
public void modifyMapping() throws IOException {
    PutMappingResponse response = client.indices().putMapping(typeMappingBuilder -> typeMappingBuilder
            .index(INDEX_NAME)
            .properties("success", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_max_word")))
            .properties("desc", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_max_word")))
    );
    log.info("response={}", response);
}

3.2.6、Get index settings API(查询 setting 信息)

/**
 * 查询 setting 信息
 */
@Test
public void getSetting() throws IOException {
    //查询所有参数
    GetIndicesSettingsResponse response = client.indices().getSettings(builder -> builder.index(INDEX_NAME));
    log.info("response={}", response);

    //查询单个参数
    response = client.indices().getSettings(builder -> builder.index(INDEX_NAME).name("index.number_of_replicas"));
    log.info("response={}", response);

    //返回中包含默认参数信息
    response = client.indices().getSettings(builder -> builder.index(INDEX_NAME).includeDefaults(true));
    log.info("response={}", response);
}

3.2.7、Update index settings API(修改 setting 信息)

/**
 * 修改 setting 信息
 */
@Test
public void modifySetting() throws IOException {
    PutIndicesSettingsResponse response = client.indices().putSettings(builder -> builder
            .index(INDEX_NAME)
            .settings(indexSettingsBuilder -> indexSettingsBuilder.maxResultWindow(10000)));
    log.info("response={}", response);
}

3.2.8、Analyze API(查看分词器分词结果)

/**
 * 查看分词器分词结果
 */
@Test
public void analyze() throws IOException {
    AnalyzeResponse response = client.indices().analyze(builder -> builder
            .analyzer("ik_max_word")
            .text("唐代伟大的现实主义文学作家"));
    logger.info("response={}", response);
}

3.3、Document APIs

3.3.1、Index API(创建/覆盖文档)

/**
 * 创建/覆盖文档
 */
@Test
public void createDoc() throws IOException {
    Map<String, Object> doc = new HashMap<>();
    doc.put("age", 30);
    doc.put("name", "李白");
    doc.put("poems", "静夜思");
    doc.put("about", "字太白");
    doc.put("success", "创造了古代浪漫主义文学高峰、歌行体和七绝达到后人难及的高度");
    //没有对应 id 的文档就创建，有就覆盖更新所有字段(相当于先删除再新增)并更新版本号。
    IndexResponse response = client.index(builder -> builder.index(INDEX_NAME).id("1").document(doc));
    log.info(response.toString());

    Poet poet = new Poet();
    poet.setAge(40);
    poet.setName("杜甫");
    poet.setPoems("登高");
    poet.setAbout("字子美");
    poet.setSuccess("唐代伟大的现实主义文学作家，唐诗思想艺术的集大成者");
    //不设置 id 将新增，id 将自动生成。
    response = client.index(builder -> builder.index(INDEX_NAME).document(poet));
    log.info(response.toString());

    Poet poet2 = new Poet(31, "杜甫", "登高", "字子美", "唐代伟大的现实主义文学作家，唐诗思想艺术的集大成者");
    //新增文档，需要设置 id。
    CreateResponse response2 = client.create(builder -> builder.index(INDEX_NAME).id("2").document(poet2));
    log.info("response2={}", response2);
}

3.3.2、Delete API(删除文档)

/**
 * 删除文档
 */
@Test
public void deleteDoc() throws IOException {
    DeleteResponse response = client.delete(builder -> builder.index(INDEX_NAME).id("2"));
    log.info(response.toString());
}

3.3.3、Get API(根据 id 查询文档)

/**
 * 根据 id 查询文档
 */
@Test
public void id() throws IOException {
    GetResponse<Map> response = client.get(builder -> builder.index(INDEX_NAME).id("1"), Map.class);
    log.info("response={}", response);
}

3.3.4、Update API(修改文档)

/**
 * 修改文档，只修改设置的字段
 */
@Test
public void updateDoc() throws IOException {
    Map<String, Object> doc = new HashMap<>();
    doc.put("age", 33);
    doc.put("name", "李白2");
    UpdateResponse response = client.update(builder -> builder.index(INDEX_NAME).id("10").doc(doc), Map.class);
    log.info("response={}", response);

    //文档不存在时插入
    Poet poet = new Poet();
    poet.setAge(40);
    poet.setName("杜甫2");
    response = client.update(builder -> builder.index(INDEX_NAME).id("11").doc(poet).docAsUpsert(true), Poet.class);
    log.info("response={}", response);
}

3.3.5、Bulk API(批量操作)

/**
 * 批量操作
 */
@Test
public void bulk() throws IOException {
    List<BulkOperation> list = new ArrayList<>();

    Map<String, Object> doc = new HashMap<>();
    doc.put("age", 30);
    doc.put("name", "李白");
    doc.put("poems", "静夜思");
    doc.put("about", "字太白");
    doc.put("success", "创造了古代浪漫主义文学高峰、歌行体和七绝达到后人难及的高度");
    //新增操作
    list.add(new BulkOperation.Builder().create(builder -> builder.index(INDEX_NAME).id("12345").document(doc)).build());
    //更新操作
    list.add(new BulkOperation.Builder().update(builder -> builder
            .index(INDEX_NAME).id("1000")
            .action(updateActionBuilder -> updateActionBuilder
                    .doc(doc))).build()
    );
    //新增或覆盖操作
    list.add(new BulkOperation.Builder().index(builder -> builder.index(INDEX_NAME).id("10").document(doc)).build());
    //删除操作
    list.add(new BulkOperation.Builder().delete(builder -> builder.index(INDEX_NAME).id("1")).build());

    BulkResponse response = client.bulk(builder -> builder.index(INDEX_NAME).operations(list));
    log.info("response={}", response);
}

3.3.6、Delete by query API(查询删除)

/**
 * 查询删除，根据查询结果删除数据
 */
@Test
public void deleteByQuery() throws IOException {
    DeleteByQueryResponse response = client.deleteByQuery(deleteByQueryRequestBuilder -> deleteByQueryRequestBuilder
            .index(INDEX_NAME)
            .query(queryBuilder -> queryBuilder
                    .term(termQueryBuilder -> termQueryBuilder
                            .field("name")
                            .value("李白")
                    )
            )
    );
    log.info("response={}", response);
}

3.3.7、Update By Query API(查询更新)

/**
 * 查询更新，根据查询结果更新数据；如果不指定查询条件将更新所有数据
 */
@Test
public void updateByQuery() throws IOException {
    UpdateByQueryResponse response = client.updateByQuery(updateByQueryRequestBuilder -> updateByQueryRequestBuilder
            .index(INDEX_NAME)
            .query(queryBuilder -> queryBuilder
                    .term(termQueryBuilder -> termQueryBuilder
                            .field("name")
                            .value("杜甫")
                    )
            )
            .script(scriptBuilder -> scriptBuilder
                    .inline(inlineScriptBuilder -> inlineScriptBuilder
                            .source("ctx._source.age=88")
                    )
            )
    );
    log.info("response={}", response);
}

3.4、Ingest APIs

3.4.1、Create or update pipeline API(创建或修改管道)

/**
 * 创建或修改管道
 */
@Test
public void createOrUpdatePipeline() throws IOException {
    PutPipelineResponse response = client.ingest().putPipeline(builder -> builder
            .id("my-pipeline")
            .description("My optional pipeline description")
            .processors(processorBuilder -> processorBuilder
                    .set(setProcessorBuilder -> setProcessorBuilder
                            .field("test-field")
                            .value(JsonData.of("test-value")))));
    log.info("response={}", response);
}

3.4.2、Delete pipeline API(删除管道)

/**
 * 删除管道
 */
@Test
public void deletePipeline() throws IOException {
    DeletePipelineResponse response = client.ingest().deletePipeline(builder -> builder.id("my-pipeline"));
    log.info("response={}", response);
}

3.4.3、Simulate pipeline API(模拟管道处理)

/**
 * 模拟管道处理
 */
@Test
public void simulatePipeline() throws IOException {
    Map<String, Object> source = new HashMap<>();
    source.put("test-field", "aa");
    SimulateResponse response = client.ingest().simulate(builder -> builder
            .id("my-pipeline")
            .docs(documentBuilder -> documentBuilder
                    .index("my-index")
                    .id("123")
                    .source(JsonData.of(source))));
    log.info("response={}", response);
}

3.5、SQL APIs

3.5.1、SQL 查询

/**
 * SQL查询
 */
@Test
public void sql() throws IOException {
    QueryResponse response = client.sql().query(builder -> builder
            .format("json").query("SELECT * FROM \"" + INDEX_NAME + "\" where name='杜甫' limit 1"));
    log.info(response.toString());
}

3.6、完整代码

package com.abc.demo.es;

import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch.core.*;
import co.elastic.clients.elasticsearch.core.bulk.BulkOperation;
import co.elastic.clients.elasticsearch.indices.*;
import co.elastic.clients.elasticsearch.ingest.*;
import co.elastic.clients.elasticsearch.sql.QueryResponse;
import co.elastic.clients.json.JsonData;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Slf4j
public class ElasticsearchJavaCase {
    private static final String INDEX_NAME = "poet-index";

    private ElasticsearchTransport transport;
    private ElasticsearchClient client;

    @Before
    public void before() {
        RestClient restClient = RestClient.builder(
                new HttpHost("10.49.196.10", 9200),
                new HttpHost("10.49.196.11", 9200),
                new HttpHost("10.49.196.12", 9200)).build();
        ObjectMapper objectMapper = new ObjectMapper();
        transport = new RestClientTransport(restClient, new JacksonJsonpMapper(objectMapper));
        client = new ElasticsearchClient(transport);
    }

    @After
    public void after() throws IOException {
        transport.close();
    }

    /**
     * 创建索引
     */
    @Test
    public void createIndex() throws IOException {
        CreateIndexResponse response = client.indices().create(builder -> builder
                .settings(indexSettingsBuilder -> indexSettingsBuilder.numberOfReplicas("1").numberOfShards("2"))
                .mappings(typeMappingBuilder -> typeMappingBuilder
                        .properties("age", propertyBuilder -> propertyBuilder.integer(integerNumberPropertyBuilder -> integerNumberPropertyBuilder))
                        .properties("name", propertyBuilder -> propertyBuilder.keyword(keywordPropertyBuilder -> keywordPropertyBuilder))
                        .properties("poems", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_smart")))
                        .properties("about", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_smart")))
                        .properties("success", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_smart")))
                )
                .index(INDEX_NAME));
        log.info("response={}", response);
    }

    /**
     * 删除索引
     */
    @Test
    public void deleteIndex() throws IOException {
        DeleteIndexResponse response = client.indices().delete(builder -> builder.index(INDEX_NAME));
        log.info("response={}", response);
    }

    /**
     * 查询索引
     */
    @Test
    public void getIndex() throws IOException {
        //查询所有索引，也可以使用 *
        GetIndexResponse response = client.indices().get(builder -> builder.index("*"));
        log.info("response={}", response);

        response = client.indices().get(builder -> builder.index(INDEX_NAME));//单个索引
        log.info("response={}", response);
    }

    /**
     * 查询 mapping 信息
     */
    @Test
    public void getMapping() throws IOException {
        //查询所有字段信息
        GetMappingResponse response = client.indices().getMapping(builder -> builder.index(INDEX_NAME));
        log.info("response={}", response);

        //查询某些字段信息
        GetFieldMappingResponse response2 = client.indices().getFieldMapping(builder -> builder.index(INDEX_NAME).fields("age"));
        log.info("response2={}", response2);
    }

    /**
     * 修改 mapping 信息
     * 可以新增字段，已有字段只能修改字段的 search_analyzer 属性
     */
    @Test
    public void modifyMapping() throws IOException {
        PutMappingResponse response = client.indices().putMapping(typeMappingBuilder -> typeMappingBuilder
                .index(INDEX_NAME)
                .properties("name", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_max_word")))
                .properties("desc", propertyBuilder -> propertyBuilder.text(textPropertyBuilder -> textPropertyBuilder.analyzer("ik_max_word").searchAnalyzer("ik_max_word")))
        );
        log.info("response={}", response);
    }

    /**
     * 查询 setting 信息
     */
    @Test
    public void getSetting() throws IOException {
        //查询所有参数
        GetIndicesSettingsResponse response = client.indices().getSettings(builder -> builder.index(INDEX_NAME));
        log.info("response={}", response);

        //查询单个参数
        response = client.indices().getSettings(builder -> builder.index(INDEX_NAME).name("index.number_of_replicas"));
        log.info("response={}", response);

        //返回中包含默认参数信息
        response = client.indices().getSettings(builder -> builder.index(INDEX_NAME).includeDefaults(true));
        log.info("response={}", response);
    }

    /**
     * 修改 setting 信息
     */
    @Test
    public void modifySetting() throws IOException {
        PutIndicesSettingsResponse response = client.indices().putSettings(builder -> builder
                .index(INDEX_NAME)
                .settings(indexSettingsBuilder -> indexSettingsBuilder.maxResultWindow(10000)));
        log.info("response={}", response);
    }

    /**
     * 查看分词器分词结果
     */
    @Test
    public void analyze() throws IOException {
        AnalyzeResponse response = client.indices().analyze(builder -> builder
                .analyzer("ik_max_word")
                .text("唐代伟大的现实主义文学作家"));
        log.info("response={}", response);
    }

    /**
     * 创建/覆盖文档
     */
    @Test
    public void createDoc() throws IOException {
        Map<String, Object> doc = new HashMap<>();
        doc.put("age", 30);
        doc.put("name", "李白");
        doc.put("poems", "静夜思");
        doc.put("about", "字太白");
        doc.put("success", "创造了古代浪漫主义文学高峰、歌行体和七绝达到后人难及的高度");
        //没有对应 id 的文档就创建，有就覆盖更新所有字段(相当于先删除再新增)并更新版本号。
        IndexResponse response = client.index(builder -> builder.index(INDEX_NAME).id("1").document(doc));
        log.info(response.toString());

        Poet poet = new Poet();
        poet.setAge(40);
        poet.setName("杜甫");
        poet.setPoems("登高");
        poet.setAbout("字子美");
        poet.setSuccess("唐代伟大的现实主义文学作家，唐诗思想艺术的集大成者");
        //不设置 id 将新增，id 将自动生成。
        response = client.index(builder -> builder.index(INDEX_NAME).document(poet));
        log.info(response.toString());

        Poet poet2 = new Poet(31, "杜甫", "登高", "字子美", "唐代伟大的现实主义文学作家，唐诗思想艺术的集大成者");
        //新增文档，需要设置 id。
        CreateResponse response2 = client.create(builder -> builder.index(INDEX_NAME).id("2").document(poet2));
        log.info("response2={}", response2);
    }

    /**
     * 删除文档
     */
    @Test
    public void deleteDoc() throws IOException {
        DeleteResponse response = client.delete(builder -> builder.index(INDEX_NAME).id("2"));
        log.info(response.toString());
    }

    /**
     * 根据 id 查询文档
     */
    @Test
    public void id() throws IOException {
        GetResponse<Map> response = client.get(builder -> builder.index(INDEX_NAME).id("1"), Map.class);
        log.info("response={}", response);
    }

    /**
     * 修改文档，只修改设置的字段
     */
    @Test
    public void updateDoc() throws IOException {
        Map<String, Object> doc = new HashMap<>();
        doc.put("age", 33);
        doc.put("name", "李白2");
        UpdateResponse response = client.update(builder -> builder.index(INDEX_NAME).id("10").doc(doc), Map.class);
        log.info("response={}", response);

        //文档不存在时插入
        Poet poet = new Poet();
        poet.setAge(40);
        poet.setName("杜甫2");
        response = client.update(builder -> builder.index(INDEX_NAME).id("11").doc(poet).docAsUpsert(true), Poet.class);
        log.info("response={}", response);
    }

    /**
     * 批量操作
     */
    @Test
    public void bulk() throws IOException {
        List<BulkOperation> list = new ArrayList<>();

        Map<String, Object> doc = new HashMap<>();
        doc.put("age", 30);
        doc.put("name", "李白");
        doc.put("poems", "静夜思");
        doc.put("about", "字太白");
        doc.put("success", "创造了古代浪漫主义文学高峰、歌行体和七绝达到后人难及的高度");
        //新增操作
        list.add(new BulkOperation.Builder().create(builder -> builder.index(INDEX_NAME).id("12345").document(doc)).build());
        //更新操作
        list.add(new BulkOperation.Builder().update(builder -> builder
                .index(INDEX_NAME).id("1000")
                .action(updateActionBuilder -> updateActionBuilder
                        .doc(doc))).build()
        );
        //新增或覆盖操作
        list.add(new BulkOperation.Builder().index(builder -> builder.index(INDEX_NAME).id("10").document(doc)).build());
        //删除操作
        list.add(new BulkOperation.Builder().delete(builder -> builder.index(INDEX_NAME).id("1")).build());

        BulkResponse response = client.bulk(builder -> builder.index(INDEX_NAME).operations(list));
        log.info("response={}", response);
    }

    /**
     * 查询删除，根据查询结果删除数据
     */
    @Test
    public void deleteByQuery() throws IOException {
        DeleteByQueryResponse response = client.deleteByQuery(deleteByQueryRequestBuilder -> deleteByQueryRequestBuilder
                .index(INDEX_NAME)
                .query(queryBuilder -> queryBuilder
                        .term(termQueryBuilder -> termQueryBuilder
                                .field("name")
                                .value("李白")
                        )
                )
        );
        log.info("response={}", response);
    }

    /**
     * 查询更新，根据查询结果更新数据；如果不指定查询条件将更新所有数据
     */
    @Test
    public void updateByQuery() throws IOException {
        UpdateByQueryResponse response = client.updateByQuery(updateByQueryRequestBuilder -> updateByQueryRequestBuilder
                .index(INDEX_NAME)
                .query(queryBuilder -> queryBuilder
                        .term(termQueryBuilder -> termQueryBuilder
                                .field("name")
                                .value("杜甫")
                        )
                )
                .script(scriptBuilder -> scriptBuilder
                        .inline(inlineScriptBuilder -> inlineScriptBuilder
                                .source("ctx._source.age=88")
                        )
                )
        );
        log.info("response={}", response);
    }

    /**
     * 创建或修改管道
     */
    @Test
    public void createOrUpdatePipeline() throws IOException {
        PutPipelineResponse response = client.ingest().putPipeline(builder -> builder
                .id("my-pipeline")
                .description("My optional pipeline description")
                .processors(processorBuilder -> processorBuilder
                        .set(setProcessorBuilder -> setProcessorBuilder
                                .field("test-field")
                                .value(JsonData.of("test-value")))));
        log.info("response={}", response);
    }

    /**
     * 删除管道
     */
    @Test
    public void deletePipeline() throws IOException {
        DeletePipelineResponse response = client.ingest().deletePipeline(builder -> builder.id("my-pipeline"));
        log.info("response={}", response);
    }

    /**
     * 模拟管道处理
     */
    @Test
    public void simulatePipeline() throws IOException {
        Map<String, Object> source = new HashMap<>();
        source.put("test-field", "aa");
        SimulateResponse response = client.ingest().simulate(builder -> builder
                .id("my-pipeline")
                .docs(documentBuilder -> documentBuilder
                        .index("my-index")
                        .id("123")
                        .source(JsonData.of(source))));
        log.info("response={}", response);
    }

    /**
     * SQL查询
     */
    @Test
    public void sql() throws IOException {
        QueryResponse response = client.sql().query(builder -> builder
                .format("json").query("SELECT * FROM \"" + INDEX_NAME + "\" where name='杜甫' limit 1"));
        log.info(response.toString());
    }

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    static class Poet {
        private Integer age;
        private String name;
        private String poems;
        private String about;
        /**成就*/
        private String success;
    }
}

ElasticsearchJavaCase.java

详细的 Elasticsearch Java API Client 使用说明，请参考官网文档：https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/index.html。

posted @ 2022-07-23 10:50 且行且码阅读(8181) 评论(0) 编辑收藏举报

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