开启ES之旅

目录：

1.创建es集群并运行
2.给文档添加索引
3.使用es查询语句检索文档
4.使用bucket、metric聚合分析结果

单机部署多实例

下载
wget "https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.5.1-linux-x86_64.tar.gz" -O elasticsearch-7.5.1-linux-x86_64.tar.gz

启动多个实例
cd elasticsearch-7.5.1/bin
./elasticsearch -d
./elasticsearch -Epath.data=data2 -Epath.logs=log2 -d
./elasticsearch -Epath.data=data3 -Epath.logs=log3 -d

验证
curl 127.0.0.1:9200/_cat/health?v
epoch      timestamp cluster       status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1578280878 03:21:18  elasticsearch green           3         3      0   0    0    0        0             0                  -                100.0%

创建索引

PUT /customer/_doc/1
{
  "name": "John Doe"
}
GET /customer/_doc/1

批处理文档，建立索引

wget  "http://github.com/elastic/elasticsearch/blob/master/docs/src/test/resources/accounts.json?raw=true"
curl -H "Content-Type: application/json" -XPOST "localhost:9200/bank/_bulk?pretty&refresh" --data-binary "@accounts.json"
GET /_cat/indices?v
health status index                    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   bank                     OzbbV0o2SySxOpp_bvjF7A   1   1       1000            0    924.8kb        462.4kb
green  open   .kibana_task_manager_1   5F536zhkQPCRqwVvgabgaw   1   1          2            1     95.3kb         51.6kb
green  open   .apm-agent-configuration jKGK8Oe7TOS-QjUrhpwmGA   1   1          0            0       566b           283b
green  open   .kibana_1                i_n9c2m9SfGsRcZsG35XMQ   1   1          6            4     65.9kb         17.1kb
green  open   customer                 hqgmxIFRT2qZsUaOXbsaBQ   1   1          1            0        7kb          3.5kb

查询

GET /bank/_search

GET /bank/_search
{
  "query": {"match_all":{}},
  "sort":[
    {"account_number": "asc"}],
  "from":10,
  "size":10
}

GET /bank/_search
{
  "query": { "match": { "address": "mill lane" } }
}

GET /bank/_search
{
  "query": { "match_phrase": { "address": "mill lane" } }
}

GET /bank/_search
{
  "query": {
    "bool": {
      "must": [
        { "match": { "age": "40" } }
      ],
      "must_not": [
        { "match": { "state": "ID" } }
      ]
    }
  }
}

GET /bank/_search
{
  "query":{
    "bool":{
      "must":{"match_all":{}},
      "filter":{
        "range":{
          "balance":{
            "gte": 20000,
            "lte": 30000
          }
        }
      }
    }
  }
}

分析

根据省份分组聚合
GET /bank/_search
{
  "size": 0,
  "aggs": {
    "group_by_state": {
      "terms": {
        "field": "state.keyword"
      }
    }
  }
}

省份分组结合账号平均存款
GET /bank/_search
{
  "size": 0,
  "aggs":{
    "group_by_state":{
      "terms":{
        "field": "state.keyword"
      },
      "aggs":{
        "average_balance":{
          "avg":{
            "field":"balance"
          }
        }
      }
    }
  }
}

省份分组结合账号平均存款，并按平均存款倒序排列
GET /bank/_search
{
  "size": 0,
  "aggs": {
    "group_by_state": {
      "terms": {
        "field": "state.keyword",
        "order": {
          "average_balance": "desc"
        }
      },
      "aggs": {
        "average_balance": {
          "avg": {
            "field": "balance"
          }
        }
      }
    }
  }
}