Elasticsearch java实现增删改查代码

以下是Elasticsearch Java实现增删改查的示例代码：

增加文档

IndexRequest request = new IndexRequest("index_name", "doc_type", "doc_id");
String jsonString = "{" +
        "\"user\":\"kimchy\"," +
        "\"postDate\":\"2013-01-30\"," +
        "\"message\":\"trying out Elasticsearch\"" +
        "}";
request.source(jsonString, XContentType.JSON);
IndexResponse response = client.index(request, RequestOptions.DEFAULT);

获取文档

GetRequest getRequest = new GetRequest("index_name", "doc_type", "doc_id");
GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
String sourceAsString = getResponse.getSourceAsString();

更新文档

UpdateRequest request = new UpdateRequest("index_name", "doc_type", "doc_id");
String jsonString = "{" +
        "\"updated_field\":\"updated_value\"" +
        "}";
request.doc(jsonString, XContentType.JSON);
UpdateResponse response = client.update(request, RequestOptions.DEFAULT);

删除文档

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

以上代码示例使用了Elasticsearch7.0及以上版本的Java API。如果使用的是较早的版本，可能需要做一些调整