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Bucket Sort Aggregation Usage
editBucket Sort Aggregation Usage
editFluent DSL example
edita => a .DateHistogram("projects_started_per_month", dh => dh .Field(p => p.StartedOn) .Interval(DateInterval.Month) .Aggregations(aa => aa .Sum("commits", sm => sm .Field(p => p.NumberOfCommits) ) .BucketSort("commits_bucket_sort", bs => bs .Sort(s => s .Descending("commits") ) .From(0) .Size(3) .GapPolicy(GapPolicy.InsertZeros) ) ) )
Object Initializer syntax example
editnew DateHistogramAggregation("projects_started_per_month") { Field = "startedOn", Interval = DateInterval.Month, Aggregations = new SumAggregation("commits", "numberOfCommits") && new BucketSortAggregation("commits_bucket_sort") { Sort = new List<ISort> { new FieldSort { Field = "commits", Order = SortOrder.Descending } }, From = 0, Size = 3, GapPolicy = GapPolicy.InsertZeros } }
Example json output.
{ "projects_started_per_month": { "date_histogram": { "field": "startedOn", "interval": "month" }, "aggs": { "commits": { "sum": { "field": "numberOfCommits" } }, "commits_bucket_sort": { "bucket_sort": { "sort": [ { "commits": { "order": "desc" } } ], "from": 0, "size": 3, "gap_policy": "insert_zeros" } } } } }
Handling Responses
editresponse.ShouldBeValid(); var projectsPerMonth = response.Aggregations.DateHistogram("projects_started_per_month"); projectsPerMonth.Should().NotBeNull(); projectsPerMonth.Buckets.Should().NotBeNull(); projectsPerMonth.Buckets.Count.Should().Be(3); double previousCommits = -1; // sum of commits should descend over buckets foreach (var item in projectsPerMonth.Buckets) { var value = item.Sum("commits").Value; if (value == null) continue; var numberOfCommits = value.Value; if (Math.Abs(previousCommits - (-1)) > double.Epsilon) numberOfCommits.Should().BeLessOrEqualTo(previousCommits); previousCommits = numberOfCommits; }