Elastica\Query\QueryString::setBoost PHP Method

    public function setBoost($boost = 1.0)
    {
        return $this->setParam('boost', (double) $boost);
    }

 /**
  * @group functional
  */
 public function testSetBoost()
 {
     $index = $this->_createIndex();
     $query = new QueryString('test');
     $query->setBoost(9.300000000000001);
     $doc = new Document('', array('name' => 'test'));
     $index->getType('test')->addDocument($doc);
     $index->refresh();
     $resultSet = $index->search($query);
     $this->assertEquals(1, $resultSet->count());
 }