You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.3 KiB
83 lines
2.3 KiB
// Copyright 2012-present Oliver Eilhard. All rights reserved.
|
|
// Use of this source code is governed by a MIT-license.
|
|
// See http://olivere.mit-license.org/license.txt for details.
|
|
|
|
package es
|
|
|
|
import "errors"
|
|
|
|
// TopMetricsAggregation selects metrics from the document with the largest or smallest "sort" value.
|
|
// top_metrics is fairly similar to top_hits in spirit but because it is more limited it is able to do
|
|
// its job using less memory and is often faster.
|
|
//
|
|
// See: https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-aggregations-metrics-top-metrics.html
|
|
type TopMetricsAggregation struct {
|
|
fields []string
|
|
sorter Sorter
|
|
size int
|
|
}
|
|
|
|
func NewTopMetricsAggregation() *TopMetricsAggregation {
|
|
return &TopMetricsAggregation{}
|
|
}
|
|
|
|
// Field adds a field to run aggregation against.
|
|
func (a *TopMetricsAggregation) Field(field string) *TopMetricsAggregation {
|
|
a.fields = append(a.fields, field)
|
|
return a
|
|
}
|
|
|
|
// Sort adds a sort order.
|
|
func (a *TopMetricsAggregation) Sort(field string, ascending bool) *TopMetricsAggregation {
|
|
a.sorter = SortInfo{Field: field, Ascending: ascending}
|
|
return a
|
|
}
|
|
|
|
// SortWithInfo adds a sort order.
|
|
func (a *TopMetricsAggregation) SortWithInfo(info SortInfo) *TopMetricsAggregation {
|
|
a.sorter = info
|
|
return a
|
|
}
|
|
|
|
// SortBy adds a sort order.
|
|
func (a *TopMetricsAggregation) SortBy(sorter Sorter) *TopMetricsAggregation {
|
|
a.sorter = sorter
|
|
return a
|
|
}
|
|
|
|
// Size sets the number of top documents returned by the aggregation. The default size is 1.
|
|
func (a *TopMetricsAggregation) Size(size int) *TopMetricsAggregation {
|
|
a.size = size
|
|
return a
|
|
}
|
|
|
|
func (a *TopMetricsAggregation) Source() (interface{}, error) {
|
|
params := make(map[string]interface{})
|
|
|
|
if len(a.fields) == 0 {
|
|
return nil, errors.New("field list is required for the top metrics aggregation")
|
|
}
|
|
metrics := make([]interface{}, len(a.fields))
|
|
for idx, field := range a.fields {
|
|
metrics[idx] = map[string]string{"field": field}
|
|
}
|
|
params["metrics"] = metrics
|
|
|
|
if a.sorter == nil {
|
|
return nil, errors.New("sorter is required for the top metrics aggregation")
|
|
}
|
|
sortSource, err := a.sorter.Source()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
params["sort"] = sortSource
|
|
|
|
if a.size > 1 {
|
|
params["size"] = a.size
|
|
}
|
|
|
|
source := map[string]interface{}{
|
|
"top_metrics": params,
|
|
}
|
|
return source, nil
|
|
}
|
|
|