如何使用java程序在elasticsearch集群上执行简单的索引、更新、获取和删除操作

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.15.0</version>
</dependency>

import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(new HttpHost("localhost", 9200, "http")));

import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.common.xcontent.XContentType;

IndexRequest request = new IndexRequest("your_index_name");
request.id("your_document_id");
request.source("{\"field1\":\"value1\",\"field2\":\"value2\"}", XContentType.JSON);

IndexResponse response = client.index(request);

import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;

UpdateRequest request = new UpdateRequest("your_index_name", "your_document_id");
request.doc("{\"field1\":\"new_value1\",\"field2\":\"new_value2\"}", XContentType.JSON);

UpdateResponse response = client.update(request);

import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;

GetRequest request = new GetRequest("your_index_name", "your_document_id");

GetResponse response = client.get(request);

import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;

DeleteRequest request = new DeleteRequest("your_index_name", "your_document_id");

DeleteResponse response = client.delete(request);