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Filters Aggregation Usage

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Filters Aggregation Usage

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Defines a multi bucket aggregations where each bucket is associated with a filter. Each bucket will collect all documents that match its associated filter. For documents that do not match any filter, these will be collected in the other bucket.

Be sure to read the Elasticsearch documentation Filters Aggregation

Named filters

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Fluent DSL example

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s => s
.Aggregations(aggs => aggs
    .Filters("projects_by_state", agg => agg
        .OtherBucket()
        .OtherBucketKey("other_states_of_being")
        .NamedFilters(filters => filters
            .Filter("belly_up", f => f.Term(p => p.State, StateOfBeing.BellyUp))
            .Filter("stable", f => f.Term(p => p.State, StateOfBeing.Stable))
            .Filter("very_active", f => f.Term(p => p.State, StateOfBeing.VeryActive))
        )
        .Aggregations(childAggs => childAggs
            .Terms("project_tags", avg => avg.Field(p => p.CuratedTags.First().Name.Suffix("keyword")))
        )
    )
)

Object Initializer syntax example

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new SearchRequest<Project>
{
    Aggregations = new FiltersAggregation("projects_by_state")
    {
        OtherBucket = true,
        OtherBucketKey = "other_states_of_being",
        Filters = new NamedFiltersContainer
        {
            { "belly_up", Query<Project>.Term(p => p.State, StateOfBeing.BellyUp) },
            { "stable", Query<Project>.Term(p => p.State, StateOfBeing.Stable) },
            { "very_active", Query<Project>.Term(p => p.State, StateOfBeing.VeryActive) }
        },
        Aggregations =
            new TermsAggregation("project_tags") { Field = Field<Project>(p => p.CuratedTags.First().Name.Suffix("keyword")) }
    }
}

Example json output.

{
  "aggs": {
    "projects_by_state": {
      "filters": {
        "other_bucket": true,
        "other_bucket_key": "other_states_of_being",
        "filters": {
          "belly_up": {
            "term": {
              "state": {
                "value": "BellyUp"
              }
            }
          },
          "stable": {
            "term": {
              "state": {
                "value": "Stable"
              }
            }
          },
          "very_active": {
            "term": {
              "state": {
                "value": "VeryActive"
              }
            }
          }
        }
      },
      "aggs": {
        "project_tags": {
          "terms": {
            "field": "curatedTags.name.keyword"
          }
        }
      }
    }
  }
}

Handling Responses

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Using the .Agg aggregation helper we can fetch our aggregation results easily in the correct type. Be sure to read more about .Aggs vs .Aggregations

response.ShouldBeValid();

var filterAgg = response.Aggs.Filters("projects_by_state");
filterAgg.Should().NotBeNull();

var namedResult = filterAgg.NamedBucket("belly_up");
namedResult.Should().NotBeNull();
namedResult.DocCount.Should().BeGreaterThan(0);

namedResult = filterAgg.NamedBucket("stable");
namedResult.Should().NotBeNull();
namedResult.DocCount.Should().BeGreaterThan(0);

namedResult = filterAgg.NamedBucket("very_active");
namedResult.Should().NotBeNull();
namedResult.DocCount.Should().BeGreaterThan(0);

namedResult = filterAgg.NamedBucket("other_states_of_being");
namedResult.Should().NotBeNull();
namedResult.DocCount.Should().Be(0);

Anonymous filters

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Fluent DSL example

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s => s
.Aggregations(aggs => aggs
    .Filters("projects_by_state", agg => agg
        .OtherBucket()
        .AnonymousFilters(
            f => f.Term(p => p.State, StateOfBeing.BellyUp),
            f => f.Term(p => p.State, StateOfBeing.Stable),
            f => f.Term(p => p.State, StateOfBeing.VeryActive)
        )
        .Aggregations(childAggs => childAggs
            .Terms("project_tags", avg => avg.Field(p => p.CuratedTags.First().Name.Suffix("keyword")))
        )
    )
)

Object Initializer syntax example

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new SearchRequest<Project>
{
    Aggregations = new FiltersAggregation("projects_by_state")
    {
        OtherBucket = true,
        Filters = new List<QueryContainer>
        {
            Query<Project>.Term(p => p.State, StateOfBeing.BellyUp),
            Query<Project>.Term(p => p.State, StateOfBeing.Stable),
            Query<Project>.Term(p => p.State, StateOfBeing.VeryActive)
        },
        Aggregations =
            new TermsAggregation("project_tags") { Field = Field<Project>(p => p.CuratedTags.First().Name.Suffix("keyword")) }
    }
}

Example json output.

{
  "aggs": {
    "projects_by_state": {
      "filters": {
        "other_bucket": true,
        "filters": [
          {
            "term": {
              "state": {
                "value": "BellyUp"
              }
            }
          },
          {
            "term": {
              "state": {
                "value": "Stable"
              }
            }
          },
          {
            "term": {
              "state": {
                "value": "VeryActive"
              }
            }
          }
        ]
      },
      "aggs": {
        "project_tags": {
          "terms": {
            "field": "curatedTags.name.keyword"
          }
        }
      }
    }
  }
}

Handling Responses

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Using the .Agg aggregation helper we can fetch our aggregation results easily in the correct type. Be sure to read more about .Aggs vs .Aggregations

response.ShouldBeValid();

var filterAgg = response.Aggs.Filters("projects_by_state");
filterAgg.Should().NotBeNull();
var results = filterAgg.AnonymousBuckets();
results.Count.Should().Be(4);

foreach (var singleBucket in results.Take(3)) singleBucket.DocCount.Should().BeGreaterThan(0);

results.Last().DocCount.Should().Be(0);

The last bucket is the other bucket

Empty Filters

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Fluent DSL example

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s => s
.Aggregations(aggs => aggs
    .Filters("empty_filters", agg => agg
        .AnonymousFilters()
    )
)

Object Initializer syntax example

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new SearchRequest<Project>
{
    Aggregations = new FiltersAggregation("empty_filters")
    {
        Filters = new List<QueryContainer>()
    }
}

Example json output.

{
  "aggs": {
    "empty_filters": {
      "filters": {
        "filters": []
      }
    }
  }
}

Handling Responses

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response.ShouldBeValid();
response.Aggs.Filters("empty_filters").Buckets.Should().BeEmpty();

Conditionless Filters

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Fluent DSL example

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s => s
.Aggregations(aggs => aggs
    .Filters("conditionless_filters", agg => agg
        .AnonymousFilters(
            q => new QueryContainer()
        )
    )
)

Object Initializer syntax example

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new SearchRequest<Project>
{
    Aggregations = new FiltersAggregation("conditionless_filters")
    {
        Filters = new List<QueryContainer>
        {
            new QueryContainer()
        }
    }
}

Example json output.

{
  "aggs": {
    "conditionless_filters": {
      "filters": {
        "filters": []
      }
    }
  }
}

Handling Responses

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response.ShouldBeValid();
response.Aggs.Filters("conditionless_filters").Buckets.Should().BeEmpty();

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