es - elasticsearch - aggs - metrics

世界上并没有完美的程序，但是我们并不因此而沮丧，因为写程序就是一个不断追求完美的过程。

问：rate有什么特点？
答：

问：rate如何使用？
答：

DELETE /rate_testPUT /rate_test
{"mappings": {"properties": {"date": {"type": "date"},"num": {"type": "integer"}}}
}POST /rate_test/_bulk
{"index": {"_id": 1}}
{"date": "2020-01-01", "num": 3}
{"index": {"_id": 2}}
{"date": "2020-01-10", "num": 7}
{"index": {"_id": 3}}
{"date": "2020-03-01", "num": 5}
{"index": {"_id": 4}}
{"date": "2020-03-05", "num": 9}
{"index": {"_id": 5}}
{"date": "2020-05-11", "num": 1}# 年 - 每个月num和 * 12
GET /rate_test/_search
{"size": 0,"aggs": {"date_aggs": {"date_histogram": {"field": "date","calendar_interval": "month"},"aggs": {"rate_aggs": {"rate": {"field": "num","unit": "year"}}}}}
}# 结果
{"took" : 2,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 5,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"date_aggs" : {"buckets" : [{"key_as_string" : "2020-01-01T00:00:00.000Z","key" : 1577836800000,"doc_count" : 2,"rate_aggs" : {"value" : 120.0}},{"key_as_string" : "2020-02-01T00:00:00.000Z","key" : 1580515200000,"doc_count" : 0,"rate_aggs" : {"value" : 0.0}},{"key_as_string" : "2020-03-01T00:00:00.000Z","key" : 1583020800000,"doc_count" : 2,"rate_aggs" : {"value" : 168.0}},{"key_as_string" : "2020-04-01T00:00:00.000Z","key" : 1585699200000,"doc_count" : 0,"rate_aggs" : {"value" : 0.0}},{"key_as_string" : "2020-05-01T00:00:00.000Z","key" : 1588291200000,"doc_count" : 1,"rate_aggs" : {"value" : 12.0}}]}}
}# 日 - 每个月num的和 / 30
GET /rate_test/_search
{"size": 0,"aggs": {"date_aggs": {"date_histogram": {"field": "date","calendar_interval": "month"},"aggs": {"rate_aggs": {"rate": {"field": "num","unit": "day"}}}}}
}# 结果
{"took" : 0,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 5,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"date_aggs" : {"buckets" : [{"key_as_string" : "2020-01-01T00:00:00.000Z","key" : 1577836800000,"doc_count" : 2,"rate_aggs" : {"value" : 0.3225806451612903}},{"key_as_string" : "2020-02-01T00:00:00.000Z","key" : 1580515200000,"doc_count" : 0,"rate_aggs" : {"value" : 0.0}},{"key_as_string" : "2020-03-01T00:00:00.000Z","key" : 1583020800000,"doc_count" : 2,"rate_aggs" : {"value" : 0.45161290322580644}},{"key_as_string" : "2020-04-01T00:00:00.000Z","key" : 1585699200000,"doc_count" : 0,"rate_aggs" : {"value" : 0.0}},{"key_as_string" : "2020-05-01T00:00:00.000Z","key" : 1588291200000,"doc_count" : 1,"rate_aggs" : {"value" : 0.03225806451612903}}]}}
}# 月 - 每个月num的和
GET /rate_test/_search
{"size": 0,"aggs": {"date_aggs": {"date_histogram": {"field": "date","calendar_interval": "month"},"aggs": {"rate_aggs": {"rate": {"field": "num","unit": "month"}}}}}
}# 结果
{"took" : 1,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 5,"relation" : "eq"},"max_score" : null,"hits" : [ ]},"aggregations" : {"date_aggs" : {"buckets" : [{"key_as_string" : "2020-01-01T00:00:00.000Z","key" : 1577836800000,"doc_count" : 2,"rate_aggs" : {"value" : 10.0}},{"key_as_string" : "2020-02-01T00:00:00.000Z","key" : 1580515200000,"doc_count" : 0,"rate_aggs" : {"value" : 0.0}},{"key_as_string" : "2020-03-01T00:00:00.000Z","key" : 1583020800000,"doc_count" : 2,"rate_aggs" : {"value" : 14.0}},{"key_as_string" : "2020-04-01T00:00:00.000Z","key" : 1585699200000,"doc_count" : 0,"rate_aggs" : {"value" : 0.0}},{"key_as_string" : "2020-05-01T00:00:00.000Z","key" : 1588291200000,"doc_count" : 1,"rate_aggs" : {"value" : 1.0}}]}}
}

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