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// 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 elastic
// SamplerAggregation is a filtering aggregation used to limit any
// sub aggregations' processing to a sample of the top-scoring documents.
// Optionally, diversity settings can be used to limit the number of matches
// that share a common value such as an "author".
//
// See: https://www.elastic.co/guide/en/elasticsearch/reference/5.2/search-aggregations-bucket-sampler-aggregation.html
type SamplerAggregation struct {
subAggregations map[string]Aggregation
meta map[string]interface{}
shardSize int
maxDocsPerValue int
executionHint string
}
func NewSamplerAggregation() *SamplerAggregation {
return &SamplerAggregation{
shardSize: -1,
maxDocsPerValue: -1,
subAggregations: make(map[string]Aggregation),
}
}
func (a *SamplerAggregation) SubAggregation(name string, subAggregation Aggregation) *SamplerAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *SamplerAggregation) Meta(metaData map[string]interface{}) *SamplerAggregation {
a.meta = metaData
return a
}
// ShardSize sets the maximum number of docs returned from each shard.
func (a *SamplerAggregation) ShardSize(shardSize int) *SamplerAggregation {
a.shardSize = shardSize
return a
}
func (a *SamplerAggregation) MaxDocsPerValue(maxDocsPerValue int) *SamplerAggregation {
a.maxDocsPerValue = maxDocsPerValue
return a
}
func (a *SamplerAggregation) ExecutionHint(hint string) *SamplerAggregation {
a.executionHint = hint
return a
}
func (a *SamplerAggregation) Source() (interface{}, error) {
// Example:
// {
// "aggs" : {
// "sample" : {
// "sampler" : {
// "shard_size" : 200
// },
// "aggs": {
// "keywords": {
// "significant_terms": {
// "field": "text"
// }
// }
// }
// }
// }
// }
//
// This method returns only the { "sampler" : { ... } } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["sampler"] = opts
if a.shardSize >= 0 {
opts["shard_size"] = a.shardSize
}
if a.maxDocsPerValue >= 0 {
opts["max_docs_per_value"] = a.maxDocsPerValue
}
if a.executionHint != "" {
opts["execution_hint"] = a.executionHint
}
// AggregationBuilder (SubAggregations)
if len(a.subAggregations) > 0 {
aggsMap := make(map[string]interface{})
source["aggregations"] = aggsMap
for name, aggregate := range a.subAggregations {
src, err := aggregate.Source()
if err != nil {
return nil, err
}
aggsMap[name] = src
}
}
// Add Meta data if available
if len(a.meta) > 0 {
source["meta"] = a.meta
}
return source, nil
}
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