最近在学习es的理论知识以及实际操作，随时更新~
概要：首先你得有1w条数据的json，然后用java读取json文件导入

一. 创建Json数据

首先我生成1.5w条数据，是为了实践分页查询，用from-size和scroll翻页去实践
生成四个字段，name、age、sex、telephone

代码如下：可直接复制粘贴用

package es;

import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;

/**
 * 生成1.5W条json数据
 */
public class JsonGenerator {
    public static void main(String[] args) {
        int numberOfRecords = 15000;
        String outputFile = "user.json";

        try (FileWriter writer = new FileWriter(outputFile)) {
            for (int i = 0; i < numberOfRecords; i++) {
                writer.write(generateJsonRecord());
                if (i < numberOfRecords - 1) {
                    writer.write(",");
                } else {
                    writer.write(" ");
                }
            }
            System.out.println("Generated " + numberOfRecords + " records successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static String generateJsonRecord() {
        String name = generateRandomName();
        int age = generateRandomAge();
        String sex = generateRandomSex();
        String telephone = generateRandomTelephone();
        return "{\"name\":\"" + name + "\",\"age\":\"" + age + "\",\"sex\":\"" + sex + "\",\"telephone\":\"" + telephone + "\"}";
    }

    private static String generateRandomName() {
        String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        StringBuilder sb = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 5; i++) {
            sb.append(characters.charAt(random.nextInt(characters.length())));
        }
        return sb.toString();
    }

    private static int generateRandomAge() {
        Random random = new Random();
        return random.nextInt(65) + 18;  // Generate age between 18 and 65
    }

    private static String generateRandomSex() {
        Random random = new Random();
        return random.nextBoolean() ? "Male" : "Female";
    }

    private static String generateRandomTelephone() {
        StringBuilder sb = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 10; i++) {
            sb.append(random.nextInt(10));  // Append random digit to the telephone number
        }
        sb.append("-");
        for (int i = 0; i < 3; i++) {
            sb.append(random.nextInt(10));  // Append random digit to the telephone number
        }
        return sb.toString();
    }
}

生成的文件在该位置上：

二.bulk 批量导入数据

public class EsConnectionExample {                                   
                                                                     
    public static void main(String[] args) throws IOException {      
       // 创建客户端                                                                                                            
 	 RestHighLevelClient client = new RestHighLevelClient(                                                               
         RestClient.builder(                                                                                         
                 new HttpHost("ip", port, "http"))); // 修改为你的ES地址和端口                                      
                                                                                                                                                                                                                           
     //bulk 导入  
     //这块改成你的文件的地址                                                                                         
     try (BufferedReader reader = new BufferedReader(new FileReader("user.json"))) {                     
         String line;                                                                                    
                                                                                                         
         // 构造 BulkRequest 对象并添加要导入的文档                                                                   
         BulkRequest request = new BulkRequest();                                                        
         while ((line = reader.readLine()) != null) {                                                    
             XContentBuilder builder = XContentFactory.jsonBuilder()                                     
                     .startObject()                                                                      
                     .field("name", line)                                                                
                     .field("age", line)                                                                 
                     .field("sex" , line)                                                                
                     .field("telephone", line)                                                           
                     .endObject();   
             //这块改成你的索引名字                                                                    
             IndexRequest indexRequest = new IndexRequest("my_index")                                    
                     .source(builder);                                                                   
             request.add(indexRequest);                                                                  
         }                                                                                               
                                                                                                         
         // 发送 BulkRequest 请求                                                                            
         BulkResponse response = client.bulk(request, RequestOptions.DEFAULT);                           
                                                                                                         
         if (response.hasFailures()) {                                                                   
             System.out.println("Failed to import documents.");                                          
         } else {                                                                                        
             System.out.println("Documents imported successfully!");                                     
         }                                                                                               
     } catch (IOException e) {                                                                           
         e.printStackTrace();                                                                            
     } finally {                                                                                         
         // 关闭 ElasticSearch 客户端连接                                                                       
         client.close();                                                                                 
     } 
   }                                                                                                  
 }                                                                                                                                                                                                               

此时已经插入了