RestHighLevelClient实现增删改查

RestHighLevelClient是Elasticsearch官方提供的Java高级客户端，用于与Elasticsearch进行交互。它提供了一系列方法来实现增删改查操作。

1. 增加文档:

IndexRequest request = new IndexRequest("index_name");
request.id("document_id");
request.source("field1", "value1",
                "field2", "value2",
                // more fields...
               );
IndexResponse response = client.index(request, RequestOptions.DEFAULT);

2. 删除文档:

DeleteRequest request = new DeleteRequest("index_name", "document_id");
DeleteResponse response = client.delete(request, RequestOptions.DEFAULT);

3. 更新文档:

UpdateRequest request = new UpdateRequest("index_name", "document_id");
request.doc("field1", "new_value1",
            "field2", "new_value2",
            // more fields...
           );
UpdateResponse response = client.update(request, RequestOptions.DEFAULT);

4. 获取文档:

GetRequest request = new GetRequest("index_name", "document_id");
GetResponse response = client.get(request, RequestOptions.DEFAULT);
if (response.isExists()) {
    String sourceAsString = response.getSourceAsString();
    // 处理文档数据
} else {
    // 文档不存在
}

以上代码示例了如何使用RestHighLevelClient进行增删改查操作。你可以根据具体需求调用不同的方法，操作对应的索引和文档。注意替换"index_name"和"document_id"为实际的索引和文档标识。