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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
// CollapseBuilder enables field collapsing on a search request.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.3/search-request-collapse.html
// for details.
type CollapseBuilder struct {
field string
innerHit *InnerHit
maxConcurrentGroupRequests *int
}
// NewCollapseBuilder creates a new CollapseBuilder.
func NewCollapseBuilder(field string) *CollapseBuilder {
return &CollapseBuilder{field: field}
}
// Field to collapse.
func (b *CollapseBuilder) Field(field string) *CollapseBuilder {
b.field = field
return b
}
// InnerHit option to expand the collapsed results.
func (b *CollapseBuilder) InnerHit(innerHit *InnerHit) *CollapseBuilder {
b.innerHit = innerHit
return b
}
// MaxConcurrentGroupRequests is the maximum number of group requests that are
// allowed to be ran concurrently in the inner_hits phase.
func (b *CollapseBuilder) MaxConcurrentGroupRequests(max int) *CollapseBuilder {
b.maxConcurrentGroupRequests = &max
return b
}
// Source generates the JSON serializable fragment for the CollapseBuilder.
func (b *CollapseBuilder) Source() (interface{}, error) {
// {
// "field": "user",
// "inner_hits": {
// "name": "last_tweets",
// "size": 5,
// "sort": [{ "date": "asc" }]
// },
// "max_concurrent_group_searches": 4
// }
src := map[string]interface{}{
"field": b.field,
}
if b.innerHit != nil {
hits, err := b.innerHit.Source()
if err != nil {
return nil, err
}
src["inner_hits"] = hits
}
if b.maxConcurrentGroupRequests != nil {
src["max_concurrent_group_searches"] = *b.maxConcurrentGroupRequests
}
return src, nil
}
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