主要内容
基本概念 Basic Concepts
索引和文档操作
文档查询

es版本 5.6.8



基本概念 Basic Concepts


近实时 NRT Near Real Time
文档索引到可搜索 有轻微的延迟 默认1秒

集群 Cluster
节点 Node
索引 Index
类型 Type  6.0版本起 一个index 只能有一个 type ，7.0以后不建议使用，8.0以后完全不支持
文档 document
分片和副本 shards & replicas


一个分片 对应一个 Lucene index 
分片信息查看  /_cat/shards?v

index shard prirep state   docs store ip          node
blogs 3     p      STARTED    1 3.4kb 192.168.0.10 esnode1
blogs 3     r      STARTED    1 3.4kb 192.168.0.10 esnode2
blogs 4     r      STARTED    0  162b 192.168.0.10 esnode1
blogs 4     p      STARTED    0  162b 192.168.0.10 esnode2
blogs 2     p      STARTED    1 3.5kb 192.168.0.10 esnode3
blogs 2     r      STARTED    1 3.5kb 192.168.0.10 esnode2
blogs 1     r      STARTED    0  162b 192.168.0.10 esnode3
blogs 1     p      STARTED    0  162b 192.168.0.10 esnode2
blogs 0     r      STARTED    0  162b 192.168.0.10 esnode3
blogs 0     p      STARTED    0  162b 192.168.0.10 esnode1



 elasticsearch集群搭建 



索引和文档操作

创建索引
PUT /blogs

列出所有索引
GET /_cat/indices?v
health status index uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   pets  ai5NF914RV6d20O1Ef2z8g   5   1          1            0      8.6kb          4.3kb
green  open   blogs v_s4imPNQbKem1gThEMvHA   5   1          2            0       15kb          7.5kb

/_cat/indices?v&health=green&s=docs.count:desc


索引文档时自动 创建 type 和 mapping 

创建索引类型
PUT /blogs/_mapping/blog?pretty
{"dynamic":"strict","properties":{"id":{"type":"long"},"content":{"type":"string"}}}

PUT /索引名/索引类型/_mapping
{"dynamic":false}
 
严格模式 不在mapping中的字段不能写入
{"dynamic":"strict"}

添加或更新文档
PUT  /blogs/blog/1
{"id":1,"content":"hello world"}

PUT  /blogs/blog/2
{"id":2,"content":"Java is the best programming language"}

文档更新两种方式

整个文档替换   

合并更新     
POST /blogs/blog/1/_update
{"doc":{"content":"hello world new"}}

注意是POST


文档创建或修改 POST和PUT的区别

不指定文档ID，用POST，自动生成文档ID。如果指定文档ID，PUT或POST都可以创建或修改文档 
PUT GET DELETE是幂等的，POST不一定幂等







文档查询

批量导入数据
curl -XPOST 'localhost:9200/bank/account/_bulk?pretty&refresh' --data-binary "@accounts.json"

Query DSL   JSON-style

/bank/_search?q=*&sort=account_number:desc&from=3&size=5&pretty

q=*&sort=account_number:desc&from=0&size=5&_source=account_number,balance

match_all  match  match_phrase
布尔查询   must should must_not
过滤 聚合 

 elasticsearch5.0数据索引与查询实战 



 elasticsearch集群搭建 
 elasticsearch5.0文档更新API 
 elasticsearch5.0入门之索引操作 
 elasticsearch5.0数据索引与查询实战 
 Elasticsearch analyzer 和 search_analyzer