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Significant Terms Aggregation Usage
editSignificant Terms Aggregation Usage
editAn aggregation that returns interesting or unusual occurrences of terms in a set.
The significant_terms aggregation can be very heavy when run on large indices. Work is in progress to provide more lightweight sampling techniques. As a result, the API for this feature may change in non-backwards compatible ways
See the Elasticsearch documentation on significant terms aggregation for more detail.
Fluent DSL example
edits => s .Aggregations(a => a .SignificantTerms("significant_names", st => st .Field(p => p.Name) .MinimumDocumentCountAsLong(10) .MutualInformation(mi => mi .BackgroundIsSuperSet() .IncludeNegatives() ) ) )
Object Initializer syntax example
editnew SearchRequest<Project> { Aggregations = new SignificantTermsAggregation("significant_names") { Field = Field<Project>(p => p.Name), MinimumDocumentCountAsLong = 10, MutualInformation = new MutualInformationHeuristic { BackgroundIsSuperSet = true, IncludeNegatives = true } } }
Example json output.
{ "aggs": { "significant_names": { "significant_terms": { "field": "name", "min_doc_count": 10, "mutual_information": { "background_is_superset": true, "include_negatives": true } } } } }
Handling Responses
editresponse.ShouldBeValid(); var sigNames = response.Aggs.SignificantTerms("significant_names"); sigNames.Should().NotBeNull(); sigNames.DocCount.Should().BeGreaterThan(0);
Filtering with a regular expression pattern
editUsing significant terms aggregation with filtering to include values using a regular expression pattern
Fluent DSL example
edits => s .Aggregations(a => a .SignificantTerms("significant_names", st => st .Field(p => p.Name) .MinimumDocumentCountAsLong(10) .MutualInformation(mi => mi .BackgroundIsSuperSet() .IncludeNegatives() ) .Include("pi*") ) )
Object Initializer syntax example
editnew SearchRequest<Project> { Aggregations = new SignificantTermsAggregation("significant_names") { Field = Field<Project>(p => p.Name), MinimumDocumentCountAsLong = 10, MutualInformation = new MutualInformationHeuristic { BackgroundIsSuperSet = true, IncludeNegatives = true }, IncludeTerms = new SignificantTermsIncludeExclude("pi*") } }
Example json output.
{ "aggs": { "significant_names": { "significant_terms": { "field": "name", "min_doc_count": 10, "mutual_information": { "background_is_superset": true, "include_negatives": true }, "include": "pi*" } } } }
Handling Responses
editresponse.ShouldBeValid(); var sigNames = response.Aggs.SignificantTerms("significant_names"); sigNames.Should().NotBeNull(); sigNames.DocCount.Should().BeGreaterThan(0);
Filtering with exact values
editUsing significant terms aggregation with filtering to exclude specific values
Fluent DSL example
edits => s .Aggregations(a => a .SignificantTerms("significant_names", st => st .Field(p => p.Name) .MinimumDocumentCountAsLong(10) .MutualInformation(mi => mi .BackgroundIsSuperSet() .IncludeNegatives() ) .Exclude(new [] { "pierce" }) ) )
Object Initializer syntax example
editnew SearchRequest<Project> { Aggregations = new SignificantTermsAggregation("significant_names") { Field = Field<Project>(p => p.Name), MinimumDocumentCountAsLong = 10, MutualInformation = new MutualInformationHeuristic { BackgroundIsSuperSet = true, IncludeNegatives = true }, ExcludeTerms = new SignificantTermsIncludeExclude(new[] { "pierce" }) } }
Example json output.
{ "aggs": { "significant_names": { "significant_terms": { "field": "name", "min_doc_count": 10, "mutual_information": { "background_is_superset": true, "include_negatives": true }, "exclude": [ "pierce" ] } } } }
Handling Responses
editresponse.ShouldBeValid(); var sigNames = response.Aggs.SignificantTerms("significant_names"); sigNames.Should().NotBeNull(); sigNames.DocCount.Should().BeGreaterThan(0);