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_percent 1535248805 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_SYGYIhPtiMxH5w 1 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" } ] }
3 query filter
搜索商品名称包含yagao，而且售价大于25元的商品 GET /ecommerce/product/_search { "query" : { "bool" : { "must" : { "match" : { "name" : "yagao" } }, "filter" : { "range" : { "price" : { "gt" : 25 } } } } } }
4、full-text search（全文检索）
GET /ecommerce/product/_search { "query" : { "match" : { "producer" : "yagao producer" } } }