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Reverse Nested Aggregation Usage
editReverse Nested Aggregation Usage
editFluent DSL example
edits => s
.Aggregations(a => 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 SearchRequest<Project>
{
Aggregations = new 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.
{
"aggs": {
"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.Aggs.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);
}
}