当聚合值达到某个阈值时，如何将过滤器设置为 return？

Question

以下面的聚合查询为例：

{
  "query": {
    "match_all": {}
  },
  "aggs": {
    "groupBy": {
      "terms": {
        "field": "CustomerName"
      },
      "aggs": {
        "points_sum": {
          "stats": {
            "field": "TransactionAmount"
          }
        }
      }
    }
  },
  "size": 0
}

我想知道任何 CustomerName 的平均 TransactionAmount (stats.avg) 何时高于该客户所有购买的某个阈值，一旦我索引了一个会使我的平均值高于该阈值的文档临界点。似乎 percolator 或多或少是为将文档与规则匹配而设计的，但我找不到任何使用 percolator 来匹配基于聚合结果的规则的好例子。

这可能吗？过滤器是这里最好的解决方案吗？有another/better解决方案吗？提前致谢

Answer 1

您可以为此使用 Watcher 商业产品并定义以下手表：

PUT _watcher/watch/transaction_alert
{
  "trigger": {
    "schedule": {
      "interval": "1m"
    }
  },
  "input": {
    "search": {
      "request": {
        "indices": "transactions",
        "types": "transaction",
        "body": {
          "query": {
            "match_all": {}
          },
          "size": 0,
          "aggs": {
            "groupBy": {
              "terms": {
                "field": "CustomerName"
              },
              "aggs": {
                "points_sum": {
                  "stats": {
                    "field": "TransactionAmount"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "condition": {
    "script": {
      "inline": "return ctx.payload.aggregations.groupBy.buckets.findAll{ cust -> cust.points_sum.avg >= 200}"
    }
  },
  "actions": {
    "send_email": { 
      "email": {
        "to": "<username>@<domainname>", 
        "subject": "Customer Notification - Transaction > 200",
        "body": "The attached customers have a transaction average above 0"
        "attachments" : {
           "data.yml" : {
              "data" : {
                 "format" : "yaml" 
              }
           }
        }
      }
    }
  }
}

更新

总结一下：

Watcher 是商业产品
ElastAlert（目前）还不支持它，requires some effort 让它工作

还有另一种更简单、更便宜的方法可以使用 Logstash 实现此目的。即使 elasticsearch input plugin doesn't support aggregations, it is possible to use the http_poller input plugin in order to send an aggregation query to Elasticsearch at regular intervals. Then using a filter you can check if the desired threshold is attained or not, and finally, alert someone by email if that's the case using the email 输出插件。

配置基本上是这样的（请注意，您上面的聚合查询需要进行 URL 编码并使用 source=... parameter 发送到 ES）。另请注意，我已修改您的查询以根据 points_sum.avg (desc)

对存储桶进行排序

input {
  http_poller {
    urls => {
      test1 => 'http://localhost:9200/your-index/_search?source=%7B%22query%22%3A%7B%22match_all%22%3A%7B%7D%7D%2C%22aggs%22%3A%7B%22groupBy%22%3A%7B%22terms%22%3A%7B%22field%22%3A%22CustomerName%22%2C%22order%22%3A%7B%22points_sum.avg%22%3A%22desc%22%7D%7D%2C%22aggs%22%3A%7B%22points_sum%22%3A%7B%22stats%22%3A%7B%22field%22%3A%22TransactionAmount%22%7D%7D%7D%7D%7D%2C%22size%22%3A0%7D'
   }
   # checking every 10 seconds
   interval => 10
   codec => "json"
  }
}
filter {
  split {
    field => "[aggregations][groupBy][buckets]" 
  }
}
output {
  if [aggregations][groupBy][buckets][points_sum][avg] > 200 {
    email {
      to => "<username>@<domainname>"
      subject => "Customer Notification - Transaction > 200",
      body => "The customer %{[aggregations][groupBy][buckets][key]} has a transaction average above 0"
    }
  }
}

同意，这是一个非常简单的实现，但它应该可以工作，您可以在它的基础上进行构建以使其更智能，有了 Logstash 和您的想象力，一切都是无限的；-)

更新 2

另一个 node.js 工具调用 elasticwatch 也可用于执行此操作。

当聚合值达到某个阈值时，如何将过滤器设置为 return？

How to set up percolator to return when an aggregation value hits a certain threshold?

elasticsearch

elasticsearch-percolate