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Top Hits Aggregation Usage
editTop Hits Aggregation Usage
editFluent DSL example
edits => s .Aggregations(a => a .Terms("states", t => t .Field(p => p.State) .Aggregations(aa => aa .TopHits("top_state_hits", th => th .Sort(srt => srt .Field(sf => sf .Field(p => p.StartedOn) .Order(SortOrder.Descending) ) .Script(ss => ss .Type("number") .Script(sss => sss .Inline("sin(doc['numberOfCommits'].value)") .Lang("groovy") ) .Order(SortOrder.Descending) ) ) .Source(src => src .Include(fs => fs .Field(p => p.Name) .Field(p => p.StartedOn) ) ) .Size(1) .Version() .Explain() .FielddataFields(fd => fd .Field(p => p.State) .Field(p => p.NumberOfCommits) ) .Fields(f => f .Field(p => p.LastActivity) ) .Highlight(h => h .Fields( hf => hf.Field(p => p.Tags), hf => hf.Field(p => p.Description) ) ) .ScriptFields(sfs => sfs .ScriptField("commit_factor", sf => sf .Inline("doc['numberOfCommits'].value * 2") ) ) ) ) ) )
Object Initializer syntax example
editnew SearchRequest<Project> { Aggregations = new TermsAggregation("states") { Field = Field<Project>(p => p.State), Aggregations = new TopHitsAggregation("top_state_hits") { Sort = new List<ISort> { new SortField { Field = Field<Project>(p => p.StartedOn), Order = SortOrder.Descending }, new ScriptSort { Type = "number", Script = new InlineScript("sin(doc['numberOfCommits'].value)") { Lang = "groovy" }, Order = SortOrder.Descending }, }, Source = new SourceFilter { Include = new [] { "name", "startedOn" } }, Size = 1, Version = true, Explain = true, FielddataFields = new [] { "state", "numberOfCommits" }, Fields = new[] { "lastActivity" }, Highlight = new Highlight { Fields = new Dictionary<Nest.Field, IHighlightField> { { Field<Project>(p => p.Tags), new HighlightField() }, { Field<Project>(p => p.Description), new HighlightField() } } }, ScriptFields = new ScriptFields { { "commit_factor", new ScriptField { Script = new InlineScript("doc['numberOfCommits'].value * 2") } } } } } }
Example json output.
{ "aggs": { "states": { "terms": { "field": "state" }, "aggs": { "top_state_hits": { "top_hits": { "sort": [ { "startedOn": { "order": "desc" } }, { "_script": { "type": "number", "script": { "lang": "groovy", "inline": "sin(doc['numberOfCommits'].value)" }, "order": "desc" } } ], "_source": { "include": [ "name", "startedOn" ] }, "size": 1, "version": true, "explain": true, "fielddata_fields": [ "state", "numberOfCommits" ], "fields": [ "lastActivity" ], "highlight": { "fields": { "tags": {}, "description": {} } }, "script_fields": { "commit_factor": { "script": { "inline": "doc['numberOfCommits'].value * 2" } } } } } } } } }
Handling Responses
editresponse.IsValid.Should().BeTrue(); var states = response.Aggs.Terms("states"); states.Should().NotBeNull(); states.Buckets.Should().NotBeNullOrEmpty(); foreach(var state in states.Buckets) { state.Key.Should().NotBeNullOrEmpty(); state.DocCount.Should().BeGreaterThan(0); var topStateHits = state.TopHits("top_state_hits"); topStateHits.Should().NotBeNull(); topStateHits.Total.Should().BeGreaterThan(0); var hits = topStateHits.Hits<Project>(); hits.Should().NotBeNullOrEmpty(); hits.All(h => h.Explanation != null).Should().BeTrue(); hits.All(h => h.Version.HasValue).Should().BeTrue(); hits.All(h => h.Fields.ValuesOf<StateOfBeing>("state").Any()).Should().BeTrue(); hits.All(h => h.Fields.ValuesOf<int>("numberOfCommits").Any()).Should().BeTrue(); hits.All(h => h.Fields.ValuesOf<int>("commit_factor").Any()).Should().BeTrue(); hits.All(h => h.Fields.ValuesOf<DateTime>("lastActivity").Any()).Should().BeTrue(); topStateHits.Documents<Project>().Should().NotBeEmpty(); }