MAGETWO-80789: [Indexer] Search Indexer is scoped & multi-threaded

Author: slopukhov

app/code/Magento/CatalogSearch/composer.json

@@ -5,6 +5,7 @@
         "php": "7.0.2|7.0.4|~7.0.6|~7.1.0",
         "magento/module-store": "100.2.*",
         "magento/module-catalog": "102.0.*",
+        "magento/module-indexer": "100.2.*",
         "magento/module-search": "100.2.*",
         "magento/module-customer": "101.0.*",
         "magento/module-directory": "100.2.*",

app/code/Magento/CatalogSearch/etc/module.xml

@@ -10,6 +10,7 @@
         <sequence>
             <module name="Magento_Search"/>
             <module name="Magento_Catalog"/>
+            <module name="Magento_Indexer"/>
         </sequence>
     </module>
 </config>