python 使用 elasticsearch 常用方法（聚合）

#记录聚合查询方法

from elasticsearch import Elasticsearch

es = Elasticsearch(['xx.xx.xx.xx:9200'])

#获取最小的年龄
res = es.search(index='test6', body = {
    "query": {
        "match_all": {}
    },
    "aggs": {
        "min_age": {
            "min": {
                "field": "age"
            }
        }
    }
})
print(res['aggregations']['min_age']['value'])

#获取最大的年龄
res = es.search(index='test6', body = {
    "query": {
        "match_all": {}
    },
    "aggs": {
        "max_age": {
            "max": {
                "field": "age"
            }
        }
    }
})
print(res['aggregations']['max_age']['value'])

#获取年龄和
res = es.search(index='test6', body = {
    "query": {
        "match_all": {}
    },
    "aggs": {
        "sum_age": {
            "sum": {
                "field": "age"
            }
        }
    }
})
print(res['aggregations']['sum_age']['value'])

#获取平均年龄
res = es.search(index='test6', body = {
    "query": {
        "match_all": {}
    },
    "aggs": {
        "avg_age": {
            "avg": {
                "field": "age"
            }
        }
    }
})
print(res['aggregations']['avg_age']['value'])

# from、size
#from：从“第几条”开始查询, size：查询多少条
res = es.search(index='test6', body = {
    "query": {
        "match_all": {}
    },
    "size": 1,
    "from": 2
})
print(res)