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Elasticsearch programming

1, Add position data

1. Initialize client connection

2. Close client connection

3. Write code to add position data

4. Write test cases and add test methods

Elasticsearch programming

1, Add position data

1. Initialize client connection

• Build a client connection using RestHighLevelClient.
• RestClientBuilder is built based on RestClient.builder method
• Add nodes of ES with HttpHost

Reference code:

private RestHighLevelClient restHighLevelClient;
private static final String JOB_IDX_NAME = "job_idx";

public JobFullTextServiceImpl() {
    restHighLevelClient = new RestHighLevelClient(RestClient.builder(
            new HttpHost("node1", 9200, "http")
            , new HttpHost("node2", 9200, "http")
            , new HttpHost("node3", 9200, "http")
    ));
}

2. Close client connection

@Override
public void close() {
    try {
        restHighLevelClient.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

3. Write code to add position data

Implementation steps:

• An IndexRequest object is built to describe the data requested by ES.
• Set the document ID.
• Use FastJSON to convert entity class objects to JSON.
• Use the IndexRequest.source method to set the document data and set the requested data to JSON format.
• Use ES High level client to call the index method to initiate a request to add a document to the index.

Reference code:

@Override
public void add(JobDetail jobDetail) {
    // 1. Build an IndexRequest object to describe the data requested by ES.
    IndexRequest indexRequest = new IndexRequest(JOB_IDX_NAME);

    // 2. Set the document ID.
    indexRequest.id(jobDetail.getId() + "");

    // 3. Build an entity class object and use FastJSON to convert the entity class object into JSON.
    String json = JSON.toJSONString(jobDetail);

    // 4. Use the IndexRequest.source method to set the request data.
    indexRequest.source(json);

    try {
        // 5. Use ES High level client to call the index method to initiate the request
        restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
    } catch (IOException e) {
        e.printStackTrace();
    }

    System.out.println("Index created successfully!");
}

Common errors:

java.lang.IllegalArgumentException: The number of object passed must be even but was [1]

	at org.elasticsearch.action.index.IndexRequest.source(IndexRequest.java:474)
	at org.elasticsearch.action.index.IndexRequest.source(IndexRequest.java:461)

Reason: IndexRequest.source requested to pass an even number of parameters, but only one was passed

4. Write test cases and add test methods

• Create one in the test/java directory   cn.it.elasticsearch.service package.
• Create a JobFullTextServiceTest class under cn.it.elasticsearch.service package.
• The JobFullTextService object is constructed in @BeforeTest, and the close method is called in @AfterTest to close the connection.
• Write test cases, build an entity class for testing, and test the add method.

Reference code:

public class JobFullTextServiceTest {

    private JobFullTextService jobFullTextService;

    @BeforeTest
    public void beforeTest() {
        jobFullTextService = new JobFullTextServiceImpl();
    }

    @Test
    public void addTest() {
        // 1. Test new index documents
       jobFullTextService = new JobFullTextServiceImpl();

        JobDetail jobDetail = new JobDetail();
        jobDetail.setId(1);
        jobDetail.setArea("Jiangsu Province-Nanjing City");
        jobDetail.setCmp("Elasticsearch university");
        jobDetail.setEdu("Bachelor degree or above");
        jobDetail.setExp("One year working experience");
        jobDetail.setTitle("Big Data Engineer");
        jobDetail.setJob_type("full-time");
        jobDetail.setPv("1700 Browse times");
        jobDetail.setJd("meeting Hadoop All right");
        jobDetail.setSalary("5-9 thousand/month");

        jobFullTextService.add(jobDetail);
    }

    @AfterTest
    public void afterTest() {
        jobFullTextService.close();
    }
}

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