ElasticSearch 6.x 学习笔记：21.指标聚合

ElasticSearch 6.x 学习笔记：21.指标聚合

• 21.2 min
• 21.3 avg
• 21.4 sum
• 21.5 stats
• 21.6 高级统计
• 21.7 基数统计
• 21.8 文档数量统计
• 21.9 百分位统计

PUT my-index/person/5
{
"name":"程裕强",
"age":28,
"salary":10000
}
PUT my-index/person/6
{
"name":"hadron",
"age":19,
"salary":5000
}

GET my-index/_search
{
"size": 0,
"aggs": {
"max_age": {
"max": {"field": "age"}
}
}
}

{
"took": 4,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 6,
"max_score": 0,
"hits": []
},
"aggregations": {
"max_age": {
"value": 28
}
}
}

21.2 min

GET my-index/_search
{
"size": 0,
"aggs": {
"min_age": {
"min": {"field": "age"}
}
}
}

{
"took": 5,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 6,
"max_score": 0,
"hits": []
},
"aggregations": {
"min_age": {
"value": 19
}
}
}

21.3 avg

https://www.elastic.co/guide/en/elasticsearch/reference/6.1/search-aggregations-metrics-avg-aggregation.html

GET my-index/_search
{
"size": 0,
"aggs": {
"avg_salary": {
"avg": {"field": "salary"}
}
}
}

{
"took": 7,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 6,
"max_score": 0,
"hits": []
},
"aggregations": {
"avg_salary": {
"value": 7166.666666666667
}
}
}

21.4 sum

GET my-index/_search
{
"size": 0,
"aggs": {
"sum_salary": {
"sum": {"field": "salary"}
}
}
}

{
"took": 5,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 6,
"max_score": 0,
"hits": []
},
"aggregations": {
"sum_salary": {
"value": 43000
}
}
}

21.5 stats

GET my-index/_search
{
"size": 0,
"aggs": {
"stats_salary": {
"stats": {"field": "salary"}
}
}
}

{
"took": 5,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 6,
"max_score": 0,
"hits": []
},
"aggregations": {
"stats_salary": {
"count": 6,
"min": 5000,
"max": 10000,
"avg": 7166.666666666667,
"sum": 43000
}
}
}

21.6 高级统计

https://www.elastic.co/guide/en/elasticsearch/reference/6.1/search-aggregations-metrics-extendedstats-aggregation.html

GET my-index/_search
{
"size": 0,
"aggs": {
"stats_salary": {
"extended_stats": {"field": "salary"}
}
}
}

{
"took": 4,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 6,
"max_score": 0,
"hits": []
},
"aggregations": {
"stats_salary": {
"count": 6,
"min": 5000,
"max": 10000,
"avg": 7166.666666666667,
"sum": 43000,
"sum_of_squares": 325000000,
"variance": 2805555.5555555522,
"std_deviation": 1674.9792701868141,
"std_deviation_bounds": {
"upper": 10516.625207040295,
"lower": 3816.7081262930387
}
}
}
}

21.7 基数统计

https://www.elastic.co/guide/en/elasticsearch/reference/6.1/search-aggregations-metrics-cardinality-aggregation.html

工资基数（等级）

GET my-index/_search
{
"size": 0,
"aggs": {
"class_salary": {
"cardinality": {"field": "salary"}
}
}
}

{
"took": 44,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 6,
"max_score": 0,
"hits": []
},
"aggregations": {
"class_salary": {
"value": 4
}
}
}

21.8 文档数量统计

为了方便统计某一个字段（比如salary）的文档数，这里添加一个不含该字段的文档

PUT my-index/persion/7
{
"name":"test",
"age":26
}

GET my-index/_search
{
"size": 0,
"aggs": {
"doc_count": {
"value_count": {"field": "salary"}
}
}
}

{
"took": 10,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 7,
"max_score": 0,
"hits": []
},
"aggregations": {
"doc_count": {
"value": 6
}
}
}

21.9 百分位统计

GET my-index/_search
{
"size": 0,
"aggs": {
"persion_salary": {
"percentiles": {"field": "salary"}
}
}
}

{
"took": 19,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 7,
"max_score": 0,
"hits": []
},
"aggregations": {
"persion_salary": {
"values": {
"1.0": 5050,
"5.0": 5250,
"25.0": 6000,
"50.0": 7000,
"75.0": 8000,
"95.0": 9500,
"99.0": 9900
}
}
}
}