public function testSetScrollId()
 {
     $scrollId = 'myIdFroScrolledSearch';
     $this->request->setScrollId($scrollId);
     $params = $this->request->getParameters();
     $this->assertArrayHasKey(AbstractSearchScrollRequest::PARAM_SCROLL_ID, $params);
     $this->assertEquals($scrollId, $params[AbstractSearchScrollRequest::PARAM_SCROLL_ID]);
 }