集群健康检查
取得健康状态
GET /_cat/health?v
返回：
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent1535248805 10:00:05 elasticsearch yellow 1 1 1 1 0 0 1 0 - 50.0%
健康状态分类
green：索引的primary shard和replica shard都是active状态的
yellow：索引的primary shard都是active状态的，但是部分replica shard不是active状态，处于不可用的状态、
red：不是所有索引的primary shard都是active状态的，部分索引有数据丢失了
当前处于yellow状态是因为目前只启动了一个es进程，只有一个节点node，这是不安全的。这个节点的primary shard 有分配，但是replica shard 没有节点分配，因此是yellow状态。
快速查看集群有哪些节点
GET /_cat/indices?v
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open .kibana xSbUffi_SYGYIhPtiMxH5w1 1 1 0 3.1kb 3.1kb
简单的索引操作
创建索引：PUT /test_index?pretty
返回：
{"acknowledged": true,"shards_acknowledged": true}
删除索引：DELETE /test_index?pretty
返回：
{"acknowledged": true}
CURD 操作Demo
(1)新增商品：新增文档，建立索引
PUT /ecommerce/product/1{"name" : "xi jie jing","desc" : "gaoxiao qing jie","price" : 30,"producer" : "xijiejing producer","tags": [ "qingxi", "wuzhi"]
}
返回：
{"_index": "ecommerce","_type": "product","_id": "1","_version": 1,"result": "created","_shards": {"total": 2,"successful": 1,"failed": 0},"created": true}
新增
PUT /ecommerce/product/2{"name" : "niunai","desc" : "mengniu niunai","price" : 25,"producer" : "mengniuniunai producer","tags": [ "niunai"]
}
返回：
{"_index": "ecommerce","_type": "product","_id": "2","_version": 1,"result": "created","_shards": {"total": 2,"successful": 1,"failed": 0},"created": true}
(2)查询商品：检索文档
GET /ecommerce/product/1
返回：
{"_index": "ecommerce","_type": "product","_id": "1","_version": 1,"found": true,"_source": {"name": "xi jie jing","desc": "gaoxiao qing jie","price": 30,"producer": "xijiejing producer","tags": ["qingxi","wuzhi"]
}
}
(3)修改商品：替换文档
PUT /ecommerce/product/1{"name" : "jiaqiangban gaolujie yagao","desc" : "gaoxiao meibai","price" : 30,"producer" : "gaolujie producer","tags": [ "meibai", "fangzhu"]
}
返回：
{"_index": "ecommerce","_type": "product","_id": "1","_version": 2,"result": "updated","_shards": {"total": 2,"successful": 1,"failed": 0},"created": false}
(5)删除商品：删除文档
DELETE /ecommerce/product/1
{"found": true,"_index": "ecommerce","_type": "product","_id": "1","_version": 3,"result": "deleted","_shards": {"total": 2,"successful": 1,"failed": 0}
}
多种搜索方式
1 query string search
GET /ecommerce/product/_search
{"took": 12,"timed_out": false,"_shards": {"total": 5,"successful": 5,"failed": 0},"hits": {"total": 1,"max_score": 1,"hits": [
{"_index": "ecommerce","_type": "product","_id": "2","_score": 1,"_source": {"name": "niunai","desc": "mengniu niunai","price": 25,"producer": "mengniuniunai producer","tags": ["niunai"]
}
}
]
}
}
字段说明：
took：耗时
timed_out：是否超时
_shards：数据拆成了5个分片
hits.total：查询结果的数量，3个document
hits.max_score：匹配分数，越相关，就越匹配，分数也高
hits.hits：包含了匹配搜索的document的详细数据
此方法只是临时在命令行使用，例如crul，不适用于复杂查询。
2 query DSL
可以用json语法查询语法
查询所有的商品：
GET /ecommerce/product/_search
{"query": { "match_all": {} }
}
按照价格排序：
GET /ecommerce/product/_search
{"query": {"match": {"name" : "yagao"}
},"sort": [
{"price": "desc"}
]
}
Kappa curve)
)
)
