lib/Elastica/QueryBuilder/DSL/Query.php
public function span_within(AbstractSpanQuery $little = null, AbstractSpanQuery $big = null): SpanWithin
    {
        return new SpanWithin($little, $big);
    }
public function span_within(AbstractSpanQuery $little = null, AbstractSpanQuery $big = null): SpanWithin
    {
        return new SpanWithin($little, $big);
    }
public function span_within ( AbstractSpanQuery $ little = null , AbstractSpanQuery $ big = null ) : SpanWithin { return new SpanWithin ( $ little , $ big ) ; }
span_within query.

@param AbstractSpanQuery|null $little
@param AbstractSpanQuery|null $big

@return SpanWithin

@see https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-span-within-query.html
span_within query .