elaticsearch学习
2023-06-13 09:12:12 时间
elaticsearch学习（一）
概念
- _index
文档在哪存放 - _type（在7.x版本弱化此概念）
文档表示的对象类别 - _id
文档的唯一标识
新增文档 PUT 格式
PUT /{index}/{type}/{id}
{
"field": "value",
...
}示例
PUT /website/blog/123
{
"title": "My first blog entry",
"text": "Just trying this out...",
"date": "2014/01/01"
}结果
{
"_index" : "website",
"_type" : "blog",
"_id" : "123",
"_version" : 1,
"result" : "created",
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 0,
"_primary_term" : 1
}特点
具有幂等性，每次操作都是全覆盖，无法做更新操作POST 格式
自动生成id
POST /{index}/{type}
{
"field": "value",
...
}
//指定id
POST /{index}/{type}/{id}
{
"field": "value",
...
}示例
POST /website/blog/
{
"title": "My second blog entry",
"text": "Still trying this out...",
"date": "2014/01/01"
}
POST /website/blog/123
{
"title": "My second blog entry",
"text": "Still trying this out...",
"date": "2014/01/01"
}
POST /website/blog/123
{
"title": "我只修改这一行"
}创建时增加条件
如果创建指定inde、id的文档存在的话，则返回错误信息。
不存在则创建。示例
PUT /website/blog/123/_create
{ ... }
PUT /website/blog/123?op_type=create
{ ... }取回文档 GET 示例
GET /website/blog/123/_source
GET /website/blog/123?pretty --- pretty格式化输出，是输出结果更加美观
GET /website/blog/123 --- 返回指定id全部文档内容结果
{
"title" : "My first blog entry",
"text" : "Just trying this out...",
"date" : "2014/01/01"
}
格式化后的结果
{
"_index" : "website",
"_type" : "blog",
"_id" : "123",
"_version" : 16,
"_seq_no" : 15,
"_primary_term" : 1,
"found" : true,
"_source" : {
"title" : "My first blog entry",
"text" : "Just trying this out...",
"date" : "2014/01/01"
}
}
{
"_index" : "website",
"_type" : "blog",
"_id" : "123",
"_version" : 16,
"_seq_no" : 15,
"_primary_term" : 1,
"found" : true,
"_source" : {
"title" : "My first blog entry",
"text" : "Just trying this out...",
"date" : "2014/01/01"
}
}更新文档 PUT 特点：全量更新 POST 示例
POST /website/blog/123/_update
{
"doc":{
"date": "2018/01/01"
}
}结果
{
"_index" : "website",
"_type" : "blog",
"_id" : "123",
"_version" : 18,
"result" : "updated",
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 17,
"_primary_term" : 1
}特点：与PUT相比，不具有幂等性，可以局部更新 删除文档 DELETE 示例
DELETE /website/blog/123结果
{
"_index" : "website",
"_type" : "blog",
"_id" : "123",
"_version" : 19,
"result" : "deleted", ---成功 deleted ---失败 not_found
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 18,
"_primary_term" : 1
}