[[facets]] == Facets Elasticsearch provides a full Java API to play with facets. See the {ref}/search-facets.html[Facets guide]. Use the factory for facet builders (`FacetBuilders`) and add each facet you want to compute when querying and add it to your search request: [source,java] -------------------------------------------------- SearchResponse sr = node.client().prepareSearch() .setQuery( /* your query */ ) .addFacet( /* add a facet */ ) .execute().actionGet(); -------------------------------------------------- Note that you can add more than one facet. See {ref}/search-search.html[Search Java API] for details. To build facet requests, use `FacetBuilders` helpers. Just import them in your class: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.FacetBuilders.*; -------------------------------------------------- === Facets ==== Terms Facet Here is how you can use {ref}/search-facets-terms-facet.html[Terms Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.termsFacet("f") .field("brand") .size(10); -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.terms.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object TermsFacet f = (TermsFacet) sr.facets().facetsAsMap().get("f"); f.getTotalCount(); // Total terms doc count f.getOtherCount(); // Not shown terms doc count f.getMissingCount(); // Without term doc count // For each entry for (TermsFacet.Entry entry : f) { entry.getTerm(); // Term entry.getCount(); // Doc count } -------------------------------------------------- ==== Range Facet Here is how you can use {ref}/search-facets-range-facet.html[Range Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.rangeFacet("f") .field("price") // Field to compute on .addUnboundedFrom(3) // from -infinity to 3 (excluded) .addRange(3, 6) // from 3 to 6 (excluded) .addUnboundedTo(6); // from 6 to +infinity -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.range.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object RangeFacet f = (RangeFacet) sr.facets().facetsAsMap().get("f"); // For each entry for (RangeFacet.Entry entry : f) { entry.getFrom(); // Range from requested entry.getTo(); // Range to requested entry.getCount(); // Doc count entry.getMin(); // Min value entry.getMax(); // Max value entry.getMean(); // Mean entry.getTotal(); // Sum of values } -------------------------------------------------- ==== Histogram Facet Here is how you can use {ref}/search-facets-histogram-facet.html[Histogram Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- HistogramFacetBuilder facet = FacetBuilders.histogramFacet("f") .field("price") .interval(1); -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.histogram.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object HistogramFacet f = (HistogramFacet) sr.facets().facetsAsMap().get("f"); // For each entry for (HistogramFacet.Entry entry : f) { entry.getKey(); // Key (X-Axis) entry.getCount(); // Doc count (Y-Axis) } -------------------------------------------------- ==== Date Histogram Facet Here is how you can use {ref}/search-facets-date-histogram-facet.html[Date Histogram Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.dateHistogramFacet("f") .field("date") // Your date field .interval("year"); // You can also use "quarter", "month", "week", "day", // "hour" and "minute" or notation like "1.5h" or "2w" -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.datehistogram.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object DateHistogramFacet f = (DateHistogramFacet) sr.facets().facetsAsMap().get("f"); // For each entry for (DateHistogramFacet.Entry entry : f) { entry.getTime(); // Date in ms since epoch (X-Axis) entry.getCount(); // Doc count (Y-Axis) } -------------------------------------------------- ==== Filter Facet (not facet filter) Here is how you can use {ref}/search-facets-filter-facet.html[Filter Facet] with Java API. If you are looking on how to apply a filter to a facet, have a look at link:#facet-filter[facet filter] using Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.filterFacet("f", FilterBuilders.termFilter("brand", "heineken")); // Your Filter here -------------------------------------------------- See <> to learn how to build filters using Java. ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.filter.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object FilterFacet f = (FilterFacet) sr.facets().facetsAsMap().get("f"); f.getCount(); // Number of docs that matched -------------------------------------------------- ==== Query Facet Here is how you can use {ref}/search-facets-query-facet.html[Query Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.queryFacet("f", QueryBuilders.matchQuery("brand", "heineken")); -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.query.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object QueryFacet f = (QueryFacet) sr.facets().facetsAsMap().get("f"); f.getCount(); // Number of docs that matched -------------------------------------------------- See <> to learn how to build queries using Java. ==== Statistical Here is how you can use {ref}/search-facets-statistical-facet.html[Statistical Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.statisticalFacet("f") .field("price"); -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.statistical.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object StatisticalFacet f = (StatisticalFacet) sr.facets().facetsAsMap().get("f"); f.getCount(); // Doc count f.getMin(); // Min value f.getMax(); // Max value f.getMean(); // Mean f.getTotal(); // Sum of values f.getStdDeviation(); // Standard Deviation f.getSumOfSquares(); // Sum of Squares f.getVariance(); // Variance -------------------------------------------------- ==== Terms Stats Facet Here is how you can use {ref}/search-facets-terms-stats-facet.html[Terms Stats Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.termsStatsFacet("f") .keyField("brand") .valueField("price"); -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.termsstats.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object TermsStatsFacet f = (TermsStatsFacet) sr.facets().facetsAsMap().get("f"); f.getTotalCount(); // Total terms doc count f.getOtherCount(); // Not shown terms doc count f.getMissingCount(); // Without term doc count // For each entry for (TermsStatsFacet.Entry entry : f) { entry.getTerm(); // Term entry.getCount(); // Doc count entry.getMin(); // Min value entry.getMax(); // Max value entry.getMean(); // Mean entry.getTotal(); // Sum of values } -------------------------------------------------- ==== Geo Distance Facet Here is how you can use {ref}/search-facets-geo-distance-facet.html[Geo Distance Facet] with Java API. ===== Prepare facet request Here is an example on how to create the facet request: [source,java] -------------------------------------------------- FacetBuilders.geoDistanceFacet("f") .field("pin.location") // Field containing coordinates we want to compare with .point(40, -70) // Point from where we start (0) .addUnboundedFrom(10) // 0 to 10 km (excluded) .addRange(10, 20) // 10 to 20 km (excluded) .addRange(20, 100) // 20 to 100 km (excluded) .addUnboundedTo(100) // from 100 km to infinity (and beyond ;-) ) .unit(DistanceUnit.KILOMETERS); // All distances are in kilometers. Can be MILES -------------------------------------------------- ===== Use facet response Import Facet definition classes: [source,java] -------------------------------------------------- import org.elasticsearch.search.facet.geodistance.*; -------------------------------------------------- [source,java] -------------------------------------------------- // sr is here your SearchResponse object GeoDistanceFacet f = (GeoDistanceFacet) sr.facets().facetsAsMap().get("f"); // For each entry for (GeoDistanceFacet.Entry entry : f) { entry.getFrom(); // Distance from requested entry.getTo(); // Distance to requested entry.getCount(); // Doc count entry.getMin(); // Min value entry.getMax(); // Max value entry.getTotal(); // Sum of values entry.getMean(); // Mean } -------------------------------------------------- === Facet filters (not Filter Facet) By default, facets are applied on the query resultset whatever filters exists or are. If you need to compute facets with the same filters or even with other filters, you can add the filter to any facet using `AbstractFacetBuilder#facetFilter(FilterBuilder)` method: [source,java] -------------------------------------------------- FacetBuilders .termsFacet("f").field("brand") // Your facet .facetFilter( // Your filter here FilterBuilders.termFilter("colour", "pale") ); -------------------------------------------------- For example, you can reuse the same filter you created for your query: [source,java] -------------------------------------------------- // A common filter FilterBuilder filter = FilterBuilders.termFilter("colour", "pale"); TermsFacetBuilder facet = FacetBuilders.termsFacet("f") .field("brand") .facetFilter(filter); // We apply it to the facet SearchResponse sr = node.client().prepareSearch() .setQuery(QueryBuilders.matchAllQuery()) .setFilter(filter) // We apply it to the query .addFacet(facet) .execute().actionGet(); -------------------------------------------------- See documentation on how to build <>. === Scope By default, facets are computed within the query resultset. But, you can compute facets from all documents in the index whatever the query is, using `global` parameter: [source,java] -------------------------------------------------- TermsFacetBuilder facet = FacetBuilders.termsFacet("f") .field("brand") .global(true); --------------------------------------------------