hunk.code_window: 			badDriver := "badDriverName"
   			th.App.Config().FileSettings.DriverName = &badDriver
  
hunk.labels: keep add keep
hunk.after_edit: 			defer func() {
   				th.App.Config().FileSettings.DriverName = oldDriver
   			}()
  
hunk.file_path: api4/system_test.go
hunk.type: add
file: // 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
  
  // ReverseNestedAggregation defines a special single bucket aggregation
  // that enables aggregating on parent docs from nested documents.
  // Effectively this aggregation can break out of the nested block
  // structure and link to other nested structures or the root document,
  // which allows nesting other aggregations that aren’t part of
  // the nested object in a nested aggregation.
  //
  // See: https://www.elastic.co/guide/en/elasticsearch/reference/6.8/search-aggregations-bucket-reverse-nested-aggregation.html
  type ReverseNestedAggregation struct {
  	path            string
  	subAggregations map[string]Aggregation
  	meta            map[string]interface{}
  }
  
  // NewReverseNestedAggregation initializes a new ReverseNestedAggregation
  // bucket aggregation.
  func NewReverseNestedAggregation() *ReverseNestedAggregation {
  	return &ReverseNestedAggregation{
  		subAggregations: make(map[string]Aggregation),
  	}
  }
  
  // Path set the path to use for this nested aggregation. The path must match
  // the path to a nested object in the mappings. If it is not specified
  // then this aggregation will go back to the root document.
  func (a *ReverseNestedAggregation) Path(path string) *ReverseNestedAggregation {
  	a.path = path
  	return a
  }
  
  func (a *ReverseNestedAggregation) SubAggregation(name string, subAggregation Aggregation) *ReverseNestedAggregation {
  	a.subAggregations[name] = subAggregation
  	return a
  }
  
  // Meta sets the meta data to be included in the aggregation response.
  func (a *ReverseNestedAggregation) Meta(metaData map[string]interface{}) *ReverseNestedAggregation {
  	a.meta = metaData
  	return a
  }
  
  func (a *ReverseNestedAggregation) Source() (interface{}, error) {
  	// Example:
  	//	{
  	//    "aggs" : {
  	//      "reverse_nested" : {
  	//        "path": "..."
  	//      }
  	//    }
  	//	}
  	// This method returns only the { "reverse_nested" : {} } part.
  
  	source := make(map[string]interface{})
  	opts := make(map[string]interface{})
  	source["reverse_nested"] = opts
  
  	if a.path != "" {
  		opts["path"] = a.path
  	}
  
  	// 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
  }
  