di.xml

<?xml version="1.0"?>
<!--
/**
 * Smile_Offer dependency injection configuration.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade this module to newer
 * versions in the future.
 *
 * @category  Smile
 * @package   Smile\Offer
 * @author    Aurelien Foucret <aurelien.foucret@smile.fr>
 * @copyright 2016 Smile
 * @license   Open Software License ("OSL") v. 3.0
 */
 -->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <preference for="Smile\Offer\Api\Data\OfferInterface" type="Smile\Offer\Model\Offer" />

    <preference for="Smile\Offer\Api\Data\OfferSearchResultsInterface" type="Magento\Framework\Api\SearchResults" />

    <preference for="Smile\Offer\Api\OfferRepositoryInterface" type="Smile\Offer\Model\OfferRepository" />

    <preference for="Smile\Offer\Api\OfferManagementInterface" type="Smile\Offer\Model\OfferManagement" />

    <preference for="Smile\Offer\Model\Locator\LocatorInterface" type="Smile\Offer\Model\Locator\RegistryLocator"/>

    <type name="Magento\Framework\EntityManager\MetadataPool">
        <arguments>
            <argument name="metadata" xsi:type="array">
                <item name="Smile\Offer\Api\Data\OfferInterface" xsi:type="array">
                    <item name="entityTableName" xsi:type="string">smile_offer</item>
                    <item name="identifierField" xsi:type="string">offer_id</item>
                </item>
            </argument>
        </arguments>
    </type>

    <type name="Magento\Framework\EntityManager\HydratorPool">
        <arguments>
            <argument name="hydrators" xsi:type="array">
                <item name="Smile\Offer\Api\Data\OfferInterface" xsi:type="string">Magento\Framework\EntityManager\AbstractModelHydrator</item>
            </argument>
        </arguments>
    </type>
    <!-- Datasources resolver -->
    <type name="Smile\ElasticsuiteCore\Index\Type\DataSourceResolver">
        <arguments>
            <argument name="datasources" xsi:type="array">
                <item name="catalog_product" xsi:type="array">
                    <item name="product" xsi:type="array">
                        <item name="offers" xsi:type="object">Smile\Offer\Model\Product\Indexer\Fulltext\Datasource\OfferData</item>
                    </item>
                </item>
            </argument>
        </arguments>
    </type>
</config>