private function addAggregationProviders()
    {
        foreach ($this->_data as $requestName => $requestConfig) {
            if (isset($requestConfig['aggregationsProviders'])) {
                $providers = [];

                foreach ($requestConfig['aggregationsProviders'] as $providerName => $providerClass) {
                    $providers[$providerName] = $this->objectManager->create($providerClass, ['requestName' => $requestName]);
                }

                $this->_data[$requestName]['aggregationsProviders'] = $providers;
            }
        }
    }