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Zheng, Xiu
2dfeaff8f9
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Zheng, Xiu <zhengxiu@huawei.com> Co-committed-by: Zheng, Xiu <zhengxiu@huawei.com>
1.9 KiB
1.9 KiB
High-cardinality Field Histogram Aggregation
High-cardinality fields are usually used for histogram grouping and aggregation instead of single-point grouping and aggregation. For example, collecting the statistics of logs at a certain period. Assume that the following query statement exists:
POST testindex/_search?pretty
{
"size": 0,
"aggs": {
"avg_score": {
"avg": {
"field": "score"
},
"aggs": {
"groupbytime": {
"date_histogram": {
"field": "timestamp",
"calendar_interval": "day"
}
}
}
}
}
}
This query groups the field timestamp using a histogram and calculates the average score. timestamp is a typical high-cardinality field. To use the enhanced aggregation for the preceding query, set parameters as follows:
// Configure an index
"settings" : {
"index" : {
"search" : {
"turbo" : {
"enabled" : "true" // Enable optimization
}
},
"sort" : { // Specify a sorting key
"field" : [
"timestamp"
]
}
}
}
Parent topic: Enhanced Aggregation