我有和索引存储具有以下结构的度量:
{sensorId: 'sensor1', value: '13.5', 'timestamp': '2016-02-19 12:00:00'}
{sensorId: 'sensor1', value: '15.7', 'timestamp': '2016-02-19 12:02:00'}
{sensorId: 'sensor1', value: '14.3', 'timestamp': '2016-02-19 12:09:00'}
{sensorId: 'sensor1', value: '14.6', 'timestamp': '2016-02-19 12:13:00'}
有没有办法汇总这些衡量标准并返回衡量标准与之前衡量标准之差的总和?例如,操作应类似于:
"query" : {
//operations
},
"aggs": {
"difference_per_day": {
"date_histogram": {
"field": "timestamp",
"interval": "day"
},
"aggs": {
"difference": {
"sum": {
"script": "doc[index]['value'].value - doc[index-1]['value'].value"
}
}
}
}
}
有可能吗?提前谢谢。