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<?php
namespace Elastica\Aggregation;
use Elastica\Filter\AbstractFilter;
/**
* Class SignificantTerms.
*
* @link http://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-significantterms-aggregation.html
*/
class SignificantTerms extends AbstractTermsAggregation
{
/**
* The default source of statistical information for background term frequencies is the entire index and this scope can
* be narrowed through the use of a background_filter to focus in on significant terms within a narrower context.
*
* @param AbstractFilter $filter
*
* @return $this
*
* @see https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-significantterms-aggregation.html#_custom_background_context
*/
public function setBackgroundFilter(AbstractFilter $filter)
{
return $this->setParam('background_filter', $filter->toArray());
}
}
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