Nested query doesn't work

Elastic Stack Elasticsearch
1

I have the following setup:

indexes:
website:
client: default
finder: ~
settings:
index:
analysis:
analyzer:
my_analyzer:
type: custom
tokenizer: lowercase
filter : [my_ngram]
filter:
my_ngram:
type: "edgeNGram"
min_gram: 2
max_gram: 5
types:
shop:
mappings:
username: { boost: 3 }
fullname: { boost: 2 }
bio: { boost: 1 }
userPictures:
type: "nested"
properties:
caption: { boost: 5 }
persistence:
driver: orm
model: App\MainBundle\Entity\InstagramShop
provider: ~
listener: ~

and here's my nested query in PHP:

            $finder =

$this->container->get('fos_elastica.finder.website');

            $mainQuery = new \Elastica\Query\Bool();
            $shopQuery = new \Elastica\Query\QueryString();
            $shopQuery->setParam('query', $searchquery);
            $shopQuery->setParam('fields', array(
                'username', 'bio', 'fullname'
            ));

            $pictureQuery = new \Elastica\Query\QueryString();
            $pictureQuery->setParam('query', $searchquery);
            $pictureQuery->setParam('fields', array(
                'caption'
            ));

            $nestedQuery = new \Elastica\Query\Nested();
            $nestedQuery->setPath('userPictures');
            $nestedQuery->setQuery($pictureQuery);

            $mainQuery->addShould($shopQuery);
            $mainQuery->addShould($nestedQuery);

            $items = $finder->find($mainQuery);

I wonder why this only matches with the shopQuery and not with the
nestedQuery. Here's the structure for the InstagramShop class:

class InstagramShop
{

/**
 * @Exclude()
 * @ORM\OneToMany(targetEntity="InstagramShopPicture", mappedBy="shop",

cascade={"persist"})
* @ORM\OrderBy({"created" = "DESC"})
*/
protected $userPictures;

/**
 * Get attributes
 *
 * @return \Doctrine\Common\Collections\Collection 
 */
public function getUserpictures()
{
    return $this->userPictures;
}

}

User pictures here is a collection of InstagramShopPicture which has a
caption of type string

Any idea why it can't find userPictures caption?

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