1 files changed, 111 insertions, 0 deletions
diff --git a/vendor/github.com/olivere/elastic/search_aggs_bucket_sampler.go b/vendor/github.com/olivere/elastic/search_aggs_bucket_sampler.go
new file mode 100644
index 000000000..0fd729dfd
--- /dev/null
+++ b/vendor/github.com/olivere/elastic/search_aggs_bucket_sampler.go
@@ -0,0 +1,111 @@
+// 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/6.0/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
+}