MAGETWO-36282: Refactor MySql search indexer to use indexer interface

 - MAGETWO-39532: Refactor Engine prepareData method

 - Fixed static

Author: aohorodnyk

dev/tests/static/testsuite/Magento/Test/Legacy/_files/obsolete_classes.php

@@ -3786,5 +3786,4 @@
     ['Magento\GoogleShopping\Test\Unit\Model\MassOperationsTest'],
     ['Magento\GoogleShopping\Test\Unit\Model\ObserverTest'],
     ['Magento\GoogleShopping\Test\Unit\Model\ServiceTest']
-    ['Magento\CatalogSearch\Model\Resource\EngineProvider'],
 ];

dev/tests/static/testsuite/Magento/Test/Legacy/_files/obsolete_methods.php

@@ -2300,6 +2300,6 @@
         'setHelper',
         'Magento\Authorizenet\Model\Directpost',
         'Magento\Authorizenet\Model\Directpost::setDataHelper()'
-    ]
+    ],
     ['prepareIndexdata', 'Magento\Search\Helper\Data'],
 ];