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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
// DiversifiedSamplerAggregation Like the ‘sampler` aggregation this is a filtering aggregation used to limit any
// sub aggregations’ processing to a sample of the top-scoring documents. The diversified_sampler aggregation adds
// the ability to limit the number of matches that share a common value such as an "author".
//
// See: https://www.elastic.co/guide/en/elasticsearch/reference/5.6/search-aggregations-bucket-diversified-sampler-aggregation.html
type DiversifiedSamplerAggregation struct {
subAggregations map[string]Aggregation
meta map[string]interface{}
field string
script *Script
shardSize int
maxDocsPerValue int
executionHint string
}
func NewDiversifiedSamplerAggregation() *DiversifiedSamplerAggregation {
return &DiversifiedSamplerAggregation{
shardSize: -1,
maxDocsPerValue: -1,
subAggregations: make(map[string]Aggregation),
}
}
func (a *DiversifiedSamplerAggregation) SubAggregation(name string, subAggregation Aggregation) *DiversifiedSamplerAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *DiversifiedSamplerAggregation) Meta(metaData map[string]interface{}) *DiversifiedSamplerAggregation {
a.meta = metaData
return a
}
// Field on which the aggregation is processed.
func (a *DiversifiedSamplerAggregation) Field(field string) *DiversifiedSamplerAggregation {
a.field = field
return a
}
func (a *DiversifiedSamplerAggregation) Script(script *Script) *DiversifiedSamplerAggregation {
a.script = script
return a
}
// ShardSize sets the maximum number of docs returned from each shard.
func (a *DiversifiedSamplerAggregation) ShardSize(shardSize int) *DiversifiedSamplerAggregation {
a.shardSize = shardSize
return a
}
func (a *DiversifiedSamplerAggregation) MaxDocsPerValue(maxDocsPerValue int) *DiversifiedSamplerAggregation {
a.maxDocsPerValue = maxDocsPerValue
return a
}
func (a *DiversifiedSamplerAggregation) ExecutionHint(hint string) *DiversifiedSamplerAggregation {
a.executionHint = hint
return a
}
func (a *DiversifiedSamplerAggregation) Source() (interface{}, error) {
// Example:
// {
// "aggs": {
// "my_unbiased_sample": {
// "diversified_sampler": {
// "shard_size": 200,
// "field" : "author"
// }
// }
// }
// }
//
// This method returns only the { "diversified_sampler" : { ... } } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["diversified_sampler"] = opts
if a.field != "" {
opts["field"] = a.field
}
if a.script != nil {
src, err := a.script.Source()
if err != nil {
return nil, err
}
opts["script"] = src
}
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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