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Reverse Nested Aggregation Usage
editReverse Nested Aggregation Usage
editFluent DSL example
edita => a .Nested("tags", n => n .Path(p => p.Tags) .Aggregations(aa => aa .Terms("tag_names", t => t .Field(p => p.Tags.Suffix("name")) .Aggregations(aaa => aaa .ReverseNested("tags_to_project", r => r .Aggregations(aaaa => aaaa .Terms("top_projects_per_tag", tt => tt .Field(p => p.Name) ) ) ) ) ) ) )
Object Initializer syntax example
editnew NestedAggregation("tags") { Path = "tags", Aggregations = new TermsAggregation("tag_names") { Field = "tags.name", Aggregations = new ReverseNestedAggregation("tags_to_project") { Aggregations = new TermsAggregation("top_projects_per_tag") { Field = Field<Project>(p => p.Name) } } } }
Example json output.
{ "tags": { "nested": { "path": "tags" }, "aggs": { "tag_names": { "terms": { "field": "tags.name" }, "aggs": { "tags_to_project": { "reverse_nested": {}, "aggs": { "top_projects_per_tag": { "terms": { "field": "name" } } } } } } } } }
Handling Responses
editresponse.ShouldBeValid(); var tags = response.Aggregations.Nested("tags"); tags.Should().NotBeNull(); var tagNames = tags.Terms("tag_names"); tagNames.Should().NotBeNull(); foreach (var tagName in tagNames.Buckets) { tagName.Key.Should().NotBeNullOrEmpty(); tagName.DocCount.Should().BeGreaterThan(0); var tagsToProjects = tagName.ReverseNested("tags_to_project"); tagsToProjects.Should().NotBeNull(); var topProjectsPerTag = tagsToProjects.Terms("top_projects_per_tag"); topProjectsPerTag.Should().NotBeNull(); foreach (var topProject in topProjectsPerTag.Buckets) { topProject.Key.Should().NotBeNullOrEmpty(); topProject.DocCount.Should().BeGreaterThan(0); } }