es 聚合操作（二）

书接上文，示例数据在上一篇，这里就不展示了

一、Pipeline Aggregation

支持对聚合分析的结果，再次进行聚合分析。

Pipeline 的分析结果会输出到原结果中，根据位置的不同，分为两类：

Sibling - 结果和现有分析结果同级
- Max，min，Avg & Sum Bucket
- Stats，Extended Status Bucket
- Percentiles Bucket
Parent -结果内嵌到现有的聚合分析结果之中
- Derivative(求导)
- Cumultive Sum(累计求和)
- Moving Function(移动平均值 )

min_bucket

在员工数最多的工种里，找出平均工资最低的工种

#在员工数最多的工种里，找出平均工资最低的工种
POST /employees/_search
{"size": 0, "aggs": {"jobs": {"terms": {"field": "job.keyword","size": 10},"aggs": {"avg_salary": {"avg": {"field": "salary"}}}},"min_salary_by_job": {"min_bucket": {"buckets_path": "jobs>avg_salary"}}}
}

结果：

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 3,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 20,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"jobs" : {"doc_count_error_upper_bound" : 0,"sum_other_doc_count" : 0,"buckets" : [{"key" : "Java Programmer","doc_count" : 7,"avg_salary" : {"value" : 25571.428571428572}},{"key" : "Javascript Programmer","doc_count" : 4,"avg_salary" : {"value" : 19250.0}},{"key" : "QA","doc_count" : 3,"avg_salary" : {"value" : 21000.0}},{"key" : "DBA","doc_count" : 2,"avg_salary" : {"value" : 25000.0}},{"key" : "Web Designer","doc_count" : 2,"avg_salary" : {"value" : 20000.0}},{"key" : "Dev Manager","doc_count" : 1,"avg_salary" : {"value" : 50000.0}},{"key" : "Product Manager","doc_count" : 1,"avg_salary" : {"value" : 35000.0}}]},"min_salary_by_job" : {"value" : 19250.0,"keys" : ["Javascript Programmer"]}}
}

可以看到上面所有工种里面最低薪资如下：

min_salary_by_job 结果和 jobs 的聚合同级
min_bucket 求之前结果的最小值
通过 bucket_path 关键字指定路径

stats_bucket

所有工种里面薪资的统计数据

#所有工种里面 薪资的统计数据
POST /employees/_search
{"size": 0,"aggs": {"jobs": {"terms": {"field": "job.keyword","size": 10},"aggs": {"avg_salary": {"avg": {"field": "salary"}}}},"stats_salary_by_job": {"stats_bucket": {"buckets_path": "jobs>avg_salary"}}}
}

结果：

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 1,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 20,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"jobs" : {"doc_count_error_upper_bound" : 0,"sum_other_doc_count" : 0,"buckets" : [{"key" : "Java Programmer","doc_count" : 7,"avg_salary" : {"value" : 25571.428571428572}},{"key" : "Javascript Programmer","doc_count" : 4,"avg_salary" : {"value" : 19250.0}},{"key" : "QA","doc_count" : 3,"avg_salary" : {"value" : 21000.0}},{"key" : "DBA","doc_count" : 2,"avg_salary" : {"value" : 25000.0}},{"key" : "Web Designer","doc_count" : 2,"avg_salary" : {"value" : 20000.0}},{"key" : "Dev Manager","doc_count" : 1,"avg_salary" : {"value" : 50000.0}},{"key" : "Product Manager","doc_count" : 1,"avg_salary" : {"value" : 35000.0}}]},"stats_salary_by_job" : {"count" : 7,"min" : 19250.0,"max" : 50000.0,"avg" : 27974.48979591837,"sum" : 195821.42857142858}}
}

可以看到薪资的统计值：

percentiles

平均工资的百分位数

#平均工资的百分位数
POST /employees/_search
{"size": 0,"aggs": {"jobs": {"terms": {"field": "job.keyword","size": 10},"aggs": {"avg_salary": {"avg": {"field": "salary"}}}},"percentiles_salary_by_job": {"percentiles_bucket": {"buckets_path": "jobs>avg_salary"}}}
}

结果：

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 1,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 20,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"jobs" : {"doc_count_error_upper_bound" : 0,"sum_other_doc_count" : 0,"buckets" : [{"key" : "Java Programmer","doc_count" : 7,"avg_salary" : {"value" : 25571.428571428572}},{"key" : "Javascript Programmer","doc_count" : 4,"avg_salary" : {"value" : 19250.0}},{"key" : "QA","doc_count" : 3,"avg_salary" : {"value" : 21000.0}},{"key" : "DBA","doc_count" : 2,"avg_salary" : {"value" : 25000.0}},{"key" : "Web Designer","doc_count" : 2,"avg_salary" : {"value" : 20000.0}},{"key" : "Dev Manager","doc_count" : 1,"avg_salary" : {"value" : 50000.0}},{"key" : "Product Manager","doc_count" : 1,"avg_salary" : {"value" : 35000.0}}]},"percentiles_salary_by_job" : {"values" : {"1.0" : 19250.0,"5.0" : 19250.0,"25.0" : 21000.0,"50.0" : 25000.0,"75.0" : 35000.0,"95.0" : 50000.0,"99.0" : 50000.0}}}
}

Cumulative_sum

累计求和

# 累计求和
POST /employees/_search
{"size": 0, "aggs": {"age": {"histogram": {"field": "age","min_doc_count": 0, "interval": 1},"aggs": {"avg_salary": {"avg": {"field": "salary"}},"cumulative_salary": {"cumulative_sum": {"buckets_path": "avg_salary"}}}}}
}

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 1,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 20,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"age" : {"buckets" : [{"key" : 20.0,"doc_count" : 1,"avg_salary" : {"value" : 9000.0},"cumulative_salary" : {"value" : 9000.0}},{"key" : 21.0,"doc_count" : 1,"avg_salary" : {"value" : 16000.0},"cumulative_salary" : {"value" : 25000.0}},{"key" : 22.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 25000.0}},{"key" : 23.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 25000.0}},{"key" : 24.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 25000.0}},{"key" : 25.0,"doc_count" : 3,"avg_salary" : {"value" : 17333.333333333332},"cumulative_salary" : {"value" : 42333.33333333333}},{"key" : 26.0,"doc_count" : 1,"avg_salary" : {"value" : 22000.0},"cumulative_salary" : {"value" : 64333.33333333333}},{"key" : 27.0,"doc_count" : 2,"avg_salary" : {"value" : 20000.0},"cumulative_salary" : {"value" : 84333.33333333333}},{"key" : 28.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 84333.33333333333}},{"key" : 29.0,"doc_count" : 2,"avg_salary" : {"value" : 20000.0},"cumulative_salary" : {"value" : 104333.33333333333}},{"key" : 30.0,"doc_count" : 2,"avg_salary" : {"value" : 30000.0},"cumulative_salary" : {"value" : 134333.3333333333}},{"key" : 31.0,"doc_count" : 2,"avg_salary" : {"value" : 28500.0},"cumulative_salary" : {"value" : 162833.3333333333}},{"key" : 32.0,"doc_count" : 3,"avg_salary" : {"value" : 27333.333333333332},"cumulative_salary" : {"value" : 190166.66666666666}},{"key" : 33.0,"doc_count" : 1,"avg_salary" : {"value" : 28000.0},"cumulative_salary" : {"value" : 218166.66666666666}},{"key" : 34.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 218166.66666666666}},{"key" : 35.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 218166.66666666666}},{"key" : 36.0,"doc_count" : 1,"avg_salary" : {"value" : 38000.0},"cumulative_salary" : {"value" : 256166.66666666666}},{"key" : 37.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 256166.66666666666}},{"key" : 38.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 256166.66666666666}},{"key" : 39.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 256166.66666666666}},{"key" : 40.0,"doc_count" : 0,"avg_salary" : {"value" : null},"cumulative_salary" : {"value" : 256166.66666666666}},{"key" : 41.0,"doc_count" : 1,"avg_salary" : {"value" : 50000.0},"cumulative_salary" : {"value" : 306166.6666666666}}]}}
}

二、聚合的作用范围

默认情况下，es 会对 query 中所有范围进行聚合操作

也可以指定范围：

Filter

找到所有工种，并计算年龄大于35的平均薪资

#找到所有工种，并计算年龄大于35的平均薪资
POST /employees/_search
{"size": 0, "aggs": {"older_person": {"filter": {"range": {"age": {"gte": 35}}},"aggs": {"avg_salary": {"avg": {"field": "salary"}}}},"all_jobs": {"terms": {"field": "job.keyword"}}}
}

结果：

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 1,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 20,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"older_person" : {"doc_count" : 2,"avg_salary" : {"value" : 44000.0}},"all_jobs" : {"doc_count_error_upper_bound" : 0,"sum_other_doc_count" : 0,"buckets" : [{"key" : "Java Programmer","doc_count" : 7},{"key" : "Javascript Programmer","doc_count" : 4},{"key" : "QA","doc_count" : 3},{"key" : "DBA","doc_count" : 2},{"key" : "Web Designer","doc_count" : 2},{"key" : "Dev Manager","doc_count" : 1},{"key" : "Product Manager","doc_count" : 1}]}}
}

Post field

找到所有工种，并匹配符合条件的工种

POST /employees/_search
{"aggs": {"jobs": {"terms": {"field": "job.keyword","size": 10}}},"post_filter": {"match": {"job.keyword": "Dev Manager"}}
}

结果：

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 3,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 1,"relation" : "eq"},"max_score" : 1.0,"hits" : [{"_index" : "employees","_type" : "_doc","_id" : "2","_score" : 1.0,"_source" : {"name" : "Underwood","age" : 41,"job" : "Dev Manager","gender" : "male","salary" : 50000}}]},"aggregations" : {"jobs" : {"doc_count_error_upper_bound" : 0,"sum_other_doc_count" : 0,"buckets" : [{"key" : "Java Programmer","doc_count" : 7},{"key" : "Javascript Programmer","doc_count" : 4},{"key" : "QA","doc_count" : 3},{"key" : "DBA","doc_count" : 2},{"key" : "Web Designer","doc_count" : 2},{"key" : "Dev Manager","doc_count" : 1},{"key" : "Product Manager","doc_count" : 1}]}}
}

global

默认基于 query 条件聚合，可以使用 global 进行全部数据聚合

POST employees/_search
{"size": 0,"query": {"range": {"age": {"gte": 40}}},"aggs": {"jobs": {"terms": {"field":"job.keyword"}},"all":{"global":{},"aggs":{"salary_avg":{"avg":{"field":"salary"}}}}}
}

可以看到大于 40 的工种只有一个，但是平均薪资是计算的全部员工

三、排序

指定order，按照count和key进行排序：

默认情况，按照count降序排序
指定size，就能返回相应的桶

找到所有工种，先以 Count 升序，如果 count 一样，然后再根据 key 降序

POST /employees/_search
{"size": 0, "query": {"range": {"age": {"gte": 20}}},"aggs": {"jobs": {"terms": {"field": "job.keyword","order": [{"_count": "asc"},{"_key": "desc"}]}}}
}

根据平均薪资降序，并统计平均薪资

POST employees/_search
{"size": 0,"aggs": {"jobs": {"terms": {"field":"job.keyword","order":[  {"avg_salary":"desc"}]},"aggs": {"avg_salary": {"avg": {"field":"salary"}}}}}
}

结果：

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 3,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 20,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"jobs" : {"doc_count_error_upper_bound" : 0,"sum_other_doc_count" : 0,"buckets" : [{"key" : "Dev Manager","doc_count" : 1,"avg_salary" : {"value" : 50000.0}},{"key" : "Product Manager","doc_count" : 1,"avg_salary" : {"value" : 35000.0}},{"key" : "Java Programmer","doc_count" : 7,"avg_salary" : {"value" : 25571.428571428572}},{"key" : "DBA","doc_count" : 2,"avg_salary" : {"value" : 25000.0}},{"key" : "QA","doc_count" : 3,"avg_salary" : {"value" : 21000.0}},{"key" : "Web Designer","doc_count" : 2,"avg_salary" : {"value" : 20000.0}},{"key" : "Javascript Programmer","doc_count" : 4,"avg_salary" : {"value" : 19250.0}}]}}
}

对工种分类，并根据最低薪资降序，并统计薪资

POST employees/_search
{"size": 0,"aggs": {"jobs": {"terms": {"field":"job.keyword","order":[  {"stats_salary.min":"desc"}]},"aggs": {"stats_salary": {"stats": {"field":"salary"}}}}}
}

结果：

#! Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone. See https://www.elastic.co/guide/en/elasticsearch/reference/7.17/security-minimal-setup.html to enable security.
{"took" : 2,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 20,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"jobs" : {"doc_count_error_upper_bound" : 0,"sum_other_doc_count" : 0,"buckets" : [{"key" : "Dev Manager","doc_count" : 1,"stats_salary" : {"count" : 1,"min" : 50000.0,"max" : 50000.0,"avg" : 50000.0,"sum" : 50000.0}},{"key" : "Product Manager","doc_count" : 1,"stats_salary" : {"count" : 1,"min" : 35000.0,"max" : 35000.0,"avg" : 35000.0,"sum" : 35000.0}},{"key" : "DBA","doc_count" : 2,"stats_salary" : {"count" : 2,"min" : 20000.0,"max" : 30000.0,"avg" : 25000.0,"sum" : 50000.0}},{"key" : "QA","doc_count" : 3,"stats_salary" : {"count" : 3,"min" : 18000.0,"max" : 25000.0,"avg" : 21000.0,"sum" : 63000.0}},{"key" : "Web Designer","doc_count" : 2,"stats_salary" : {"count" : 2,"min" : 18000.0,"max" : 22000.0,"avg" : 20000.0,"sum" : 40000.0}},{"key" : "Javascript Programmer","doc_count" : 4,"stats_salary" : {"count" : 4,"min" : 16000.0,"max" : 25000.0,"avg" : 19250.0,"sum" : 77000.0}},{"key" : "Java Programmer","doc_count" : 7,"stats_salary" : {"count" : 7,"min" : 9000.0,"max" : 38000.0,"avg" : 25571.428571428572,"sum" : 179000.0}}]}}
}

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