diff --git a/Classes/Domain/Index/TcaIndexer/TcaTableService.php b/Classes/Domain/Index/TcaIndexer/TcaTableService.php
index a0d5851..ee0a2d8 100644
--- a/Classes/Domain/Index/TcaIndexer/TcaTableService.php
+++ b/Classes/Domain/Index/TcaIndexer/TcaTableService.php
@@ -174,7 +174,7 @@ class TcaTableService implements TcaTableServiceInterface
         }
 
         if ($this->isBlackListedRootLineConfigured()) {
-            $parameters[':blacklistedRootLine'] = $this->getBlackListedRootLine();
+            $parameters[':blacklistedRootLine'] = implode(',', $this->getBlackListedRootLine());
             $whereClause .= ' AND pages.uid NOT IN (:blacklistedRootLine)'
                 . ' AND pages.pid NOT IN (:blacklistedRootLine)';
         }
diff --git a/Classes/Domain/Index/TcaIndexer/TcaTableService76.php b/Classes/Domain/Index/TcaIndexer/TcaTableService76.php
index 28922a5..f52027a 100644
--- a/Classes/Domain/Index/TcaIndexer/TcaTableService76.php
+++ b/Classes/Domain/Index/TcaIndexer/TcaTableService76.php
@@ -257,7 +257,6 @@ class TcaTableService76 implements TcaTableServiceInterface
             $this->tca['ctrl']['cruser_id'],
             $this->tca['ctrl']['fe_cruser_id'],
             $this->tca['ctrl']['fe_crgroup_id'],
-            $this->tca['ctrl']['languageField'],
             $this->tca['ctrl']['origUid'],
         ];
 
diff --git a/Classes/Domain/Model/SearchRequest.php b/Classes/Domain/Model/SearchRequest.php
index 22bd697..3c88871 100644
--- a/Classes/Domain/Model/SearchRequest.php
+++ b/Classes/Domain/Model/SearchRequest.php
@@ -87,6 +87,9 @@ class SearchRequest implements SearchRequestInterface
         return $this->query;
     }
 
+    /**
+     * @param array $filter
+     */
     public function setFilter(array $filter)
     {
         $filter = \TYPO3\CMS\Core\Utility\ArrayUtility::removeArrayEntryByValue($filter, '');
diff --git a/Tests/Functional/Fixtures/Indexing/TcaIndexer/KeepSysLanguageUid.xml b/Tests/Functional/Fixtures/Indexing/TcaIndexer/KeepSysLanguageUid.xml
new file mode 100644
index 0000000..f17051c
--- /dev/null
+++ b/Tests/Functional/Fixtures/Indexing/TcaIndexer/KeepSysLanguageUid.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<dataset>
+    <tt_content>
+        <uid>1</uid>
+        <pid>1</pid>
+        <tstamp>1480686370</tstamp>
+        <crdate>1480686370</crdate>
+        <hidden>0</hidden>
+        <sorting>72</sorting>
+        <sys_language_uid>2</sys_language_uid>
+        <CType>header</CType>
+        <header>indexed content element</header>
+        <bodytext>this is the content of header content element that should get indexed</bodytext>
+        <media>0</media>
+        <layout>0</layout>
+        <deleted>0</deleted>
+        <cols>0</cols>
+        <starttime>0</starttime>
+        <endtime>0</endtime>
+        <colPos>0</colPos>
+        <filelink_sorting>0</filelink_sorting>
+    </tt_content>
+</dataset>
diff --git a/Tests/Functional/Indexing/TcaIndexerTest.php b/Tests/Functional/Indexing/TcaIndexerTest.php
index 472cc15..d7ecc3a 100644
--- a/Tests/Functional/Indexing/TcaIndexerTest.php
+++ b/Tests/Functional/Indexing/TcaIndexerTest.php
@@ -77,4 +77,40 @@ class TcaIndexerTest extends AbstractFunctionalTestCase
 
         $objectManager->get(TcaIndexer::class, $tableService, $connection)->indexAllDocuments();
     }
+
+    /**
+     * @test
+     */
+    public function sysLanguageIsKept()
+    {
+        $this->importDataSet('Tests/Functional/Fixtures/Indexing/TcaIndexer/KeepSysLanguageUid.xml');
+        $objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(ObjectManager::class);
+        $tableName = 'tt_content';
+        $tableService = $objectManager->get(
+            TcaTableServiceInterface::class,
+            $tableName,
+            $objectManager->get(RelationResolver::class),
+            $objectManager->get(ConfigurationContainerInterface::class)
+        );
+
+        $connection = $this->getMockBuilder(Elasticsearch::class)
+            ->setMethods(['addDocuments'])
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $connection->expects($this->once())
+            ->method('addDocuments')
+            ->with(
+                $this->stringContains('tt_content'),
+                $this->callback(function ($documents) {
+                    if ($this->isLegacyVersion()) {
+                        return isset($documents[0]['sys_language_uid']) && $documents[0]['sys_language_uid'] === '2';
+                    } else {
+                        return isset($documents[0]['sys_language_uid']) && $documents[0]['sys_language_uid'] === 2;
+                    }
+                })
+            );
+
+        $objectManager->get(TcaIndexer::class, $tableService, $connection)->indexAllDocuments();
+    }
 }
diff --git a/Tests/Unit/Domain/Index/TcaIndexer/TcaTableServiceTest.php b/Tests/Unit/Domain/Index/TcaIndexer/TcaTableServiceTest.php
index 70174ec..f470613 100644
--- a/Tests/Unit/Domain/Index/TcaIndexer/TcaTableServiceTest.php
+++ b/Tests/Unit/Domain/Index/TcaIndexer/TcaTableServiceTest.php
@@ -74,7 +74,7 @@ class TcaTableServiceTest extends AbstractUnitTestCase
      */
     public function doUsePlainQueryIfNoAdditionalWhereClauseIsDefined()
     {
-        $this->markTestSkipped('We have to migrate this test for TYPO3 CMS 8.x');
+        $this->markTestIncomplete('We have to migrate this test for TYPO3 CMS 8.x');
         $this->configuration->expects($this->exactly(2))
             ->method('getIfExists')
             ->withConsecutive(['indexing.table.additionalWhereClause'], ['indexing.table.rootLineBlacklist'])
@@ -98,7 +98,7 @@ class TcaTableServiceTest extends AbstractUnitTestCase
      */
     public function configuredAdditionalWhereClauseIsAdded()
     {
-        $this->markTestSkipped('We have to migrate this test for TYPO3 CMS 8.x');
+        $this->markTestIncomplete('We have to migrate this test for TYPO3 CMS 8.x');
         $this->configuration->expects($this->exactly(2))
             ->method('getIfExists')
             ->withConsecutive(['indexing.table.additionalWhereClause'], ['indexing.table.rootLineBlacklist'])
@@ -110,15 +110,15 @@ class TcaTableServiceTest extends AbstractUnitTestCase
 
         $this->subject->getRecord(10);
 
-        // $whereClause = $this->subject->getWhereClause();
-        // $this->assertSame(
-        //     '1=1 AND pages.no_search = 0 AND table.field = "someValue"',
-        //     $whereClause->getStatement()
-        // );
-        // $this->assertSame(
-        //     [],
-        //     $whereClause->getParameters()
-        // );
+        $whereClause = $this->subject->getWhereClause();
+        $this->assertSame(
+            '1=1 AND pages.no_search = 0 AND table.field = "someValue"',
+            $whereClause->getStatement()
+        );
+        $this->assertSame(
+            [],
+            $whereClause->getParameters()
+        );
     }
 
     /**
@@ -126,6 +126,7 @@ class TcaTableServiceTest extends AbstractUnitTestCase
      */
     public function allConfiguredAndAllowedTcaColumnsAreReturnedAsFields()
     {
+        $this->markTestIncomplete('We have to migrate this test');
         $GLOBALS['TCA']['test_table'] = [
             'ctrl' => [
                 'languageField' => 'sys_language_uid',
@@ -161,16 +162,16 @@ class TcaTableServiceTest extends AbstractUnitTestCase
         );
         $this->inject($subject, 'logger', $this->getMockedLogger());
 
-        // $this->assertSame(
-        //     [
-        //         'test_table.uid',
-        //         'test_table.pid',
-        //         'test_table.sys_language_uid',
-        //         'test_table.available_column',
-        //     ],
-        //     $subject->getFields(),
-        //     ''
-        // );
+        $this->assertSame(
+            [
+                'test_table.uid',
+                'test_table.pid',
+                'test_table.sys_language_uid',
+                'test_table.available_column',
+            ],
+            $subject->getFields(),
+            ''
+        );
         unset($GLOBALS['TCA']['test_table']);
     }
 }