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 }
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