diff --git a/config/schema/search_api.datasource.schema.yml b/config/schema/search_api.datasource.schema.yml
index c607af8..18ae3cb 100644
--- a/config/schema/search_api.datasource.schema.yml
+++ b/config/schema/search_api.datasource.schema.yml
@@ -11,3 +11,9 @@
       sequence:
         type: string
         label: 'An entity bundle'
+    languages:
+      type: sequence
+      label: 'The selected languages'
+      sequence:
+        type: string
+        label: 'An entity language'
diff --git a/src/Plugin/search_api/datasource/ContentEntity.php b/src/Plugin/search_api/datasource/ContentEntity.php
index b292c51..113ad3c 100644
--- a/src/Plugin/search_api/datasource/ContentEntity.php
+++ b/src/Plugin/search_api/datasource/ContentEntity.php
@@ -14,6 +14,7 @@ use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Entity\Plugin\DataType\EntityAdapter;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
 use Drupal\Core\Render\Element;
 use Drupal\Core\TypedData\ComplexDataInterface;
 use Drupal\Core\TypedData\TypedDataManager;
@@ -56,6 +57,13 @@ class ContentEntity extends DatasourcePluginBase {
   protected $configFactory;
 
   /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
    * {@inheritdoc}
    */
   public function __construct(array $configuration, $plugin_id, array $plugin_definition) {
@@ -91,6 +99,10 @@ class ContentEntity extends DatasourcePluginBase {
     $config_factory = $container->get('config.factory');
     $datasource->setConfigFactory($config_factory);
 
+    /** @var $language_manager \Drupal\Core\Language\LanguageManagerInterface */
+    $language_manager = $container->get('language_manager');
+    $datasource->setLanguageManager($language_manager);
+
     return $datasource;
   }
 
@@ -195,6 +207,27 @@ class ContentEntity extends DatasourcePluginBase {
     $this->configFactory = $config_factory;
     return $this;
   }
+
+  /**
+   * Sets the language manager.
+   *
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The new language manager.
+   */
+  public function setLanguageManager(LanguageManagerInterface $language_manager) {
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * Retrieves the language manager.
+   *
+   * @return \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function getLanguageManager() {
+    return $this->languageManager ?: \Drupal::languageManager();
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -227,6 +260,24 @@ class ContentEntity extends DatasourcePluginBase {
       $entity_ids[$entity_id][$item_id] = $langcode;
     }
 
+    $allowed_languages = array();
+    $all_languages = $this->getLanguageManager()->getLanguages();
+    $configuration = $this->configuration;
+
+    if ($configuration['default']) {
+      $allowed_languages = $all_languages;
+      foreach ($configuration['languages'] as $langcode) {
+        unset($allowed_languages[$langcode]);
+      }
+    }
+    else {
+      foreach ($configuration['languages'] as $langcode => $checked) {
+        if ($checked === $langcode) {
+          $allowed_languages[$langcode] = $all_languages[$langcode];
+        }
+      }
+    }
+
     /** @var \Drupal\Core\Entity\ContentEntityInterface[] $entities */
     $entities = $this->getEntityStorage()->loadMultiple(array_keys($entity_ids));
     $missing = array();
@@ -236,7 +287,8 @@ class ContentEntity extends DatasourcePluginBase {
         // @todo Also refuse to load entities from not-included bundles? This
         //   would help to avoid possible race conditions when removing bundles
         //   from the datasource config. See #2574583.
-        if (!empty($entities[$entity_id]) && $entities[$entity_id]->hasTranslation($langcode)) {
+        $indexed_translations = array_intersect_key($entities[$entity_id]->getTranslationLanguages(), $allowed_languages);
+        if (!empty($entities[$entity_id]) && $entities[$entity_id]->hasTranslation($langcode) && array_key_exists($langcode, $indexed_translations)) {
           $items[$item_id] = $entities[$entity_id]->getTranslation($langcode)->getTypedData();
         }
         else {
@@ -335,21 +387,27 @@ class ContentEntity extends DatasourcePluginBase {
    * {@inheritdoc}
    */
   public function defaultConfiguration() {
+    $default_configuration = array();
+    if ($this->hasBundles() || $this->isTranslatable()) {
+      $default_configuration['default'] = 1;
+    }
+
     if ($this->hasBundles()) {
-      return array(
-        'default' => 1,
-        'bundles' => array(),
-      );
+      $default_configuration['bundles'] = array();
     }
-    return array();
+
+    if ($this->isTranslatable()) {
+      $default_configuration['languages'] = array();
+    }
+
+    return $default_configuration;
   }
 
   /**
    * {@inheritdoc}
    */
   public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
-    if ($this->hasBundles()) {
-      $bundles = $this->getEntityBundleOptions();
+    if ($this->hasBundles() || $this->isTranslatable()) {
       $form['default'] = array(
         '#type' => 'radios',
         '#title' => $this->t('What should be indexed?'),
@@ -359,6 +417,10 @@ class ContentEntity extends DatasourcePluginBase {
         ),
         '#default_value' => $this->configuration['default'],
       );
+    }
+
+    if ($this->hasBundles()) {
+      $bundles = $this->getEntityBundleOptions();
       $form['bundles'] = array(
         '#type' => 'checkboxes',
         '#title' => $this->t('Bundles'),
@@ -369,6 +431,16 @@ class ContentEntity extends DatasourcePluginBase {
       );
     }
 
+    if ($this->isTranslatable()) {
+      $form['languages'] = array(
+        '#type' => 'checkboxes',
+        '#title' => $this->t('Languages'),
+        '#options' => $this->getTranslationOptions(),
+        '#default_value' => $this->configuration['languages'],
+        '#multiple' => TRUE,
+      );
+    }
+
     return $form;
   }
 
@@ -390,6 +462,21 @@ class ContentEntity extends DatasourcePluginBase {
   }
 
   /**
+   * Retrieves the available languages of this entity type as an options list.
+   *
+   * @return array
+   *   An associative array of language labels, keyed by the language name.
+   */
+  protected function getTranslationOptions() {
+    $options = array();
+    foreach ($this->getLanguageManager()->getLanguages() as $language) {
+      $options[$language->getId()] = $language->getName();
+    }
+
+    return $options;
+  }
+
+  /**
    * {@inheritdoc}
    */
   public function getItemId(ComplexDataInterface $item) {
@@ -442,15 +529,29 @@ class ContentEntity extends DatasourcePluginBase {
    */
   public function getDescription() {
     $summary = '';
+
+    // Add bundle information in the description.
     if ($this->hasBundles()) {
       $bundles = array_values(array_intersect_key($this->getEntityBundleOptions(), array_filter($this->configuration['bundles'])));
       if ($this->configuration['default'] == TRUE) {
-        $summary = $this->t('Excluded bundles: @bundles', array('@bundles' => implode(', ', $bundles)));
+        $summary .= $this->t('Excluded bundles: @bundles', array('@bundles' => implode(', ', $bundles)));
+      }
+      else {
+        $summary .= $this->t('Included bundles: @bundles', array('@bundles' => implode(', ', $bundles)));
+      }
+    }
+
+    // Add language information in the description.
+    if ($this->isTranslatable()) {
+      $languages = array_values(array_intersect_key($this->getLanguageManager()->getLanguages(), array_filter($this->configuration['languages'])));
+      if ($this->configuration['default'] == TRUE) {
+        $summary .= $this->t('Excluded languages: @languages', array('@languages' => implode(', ', $languages)));
       }
       else {
-        $summary = $this->t('Included bundles: @bundles', array('@bundles' => implode(', ', $bundles)));
+        $summary .= $this->t('Included languages: @languages', array('@languages' => implode(', ', $languages)));
       }
     }
+
     return $summary;
   }
 
@@ -473,6 +574,16 @@ class ContentEntity extends DatasourcePluginBase {
   }
 
   /**
+   * Determines whether the entity type supports translations.
+   *
+   * @return bool
+   *   TRUE if the entity is translatable, FALSE otherwise.
+   */
+  protected function isTranslatable() {
+    return $this->getEntityType()->isTranslatable();
+  }
+
+  /**
    * Retrieves all bundles of this datasource's entity type.
    *
    * @return array
@@ -528,6 +639,7 @@ class ContentEntity extends DatasourcePluginBase {
         $item_ids[] = "$entity_id:$langcode";
       }
     }
+
     return $item_ids;
   }
 
diff --git a/src/Tests/IndexIntegrationTest.php b/src/Tests/IndexIntegrationTest.php
new file mode 100644
index 0000000..056a826
--- /dev/null
+++ b/src/Tests/IndexIntegrationTest.php
@@ -0,0 +1,145 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\search_api\Tests\IndexIntegrationTest.
+ */
+
+namespace Drupal\search_api\Tests;
+
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\search_api\Entity\Index;
+
+/**
+ * Tests the overall functionality of indexing specific logic.
+ *
+ * @group search_api
+ */
+class IndexIntegrationTest extends WebTestBase {
+
+  /**
+   * The ID of the search server used for this test.
+   *
+   * @var string
+   */
+  protected $serverId;
+
+  /**
+   * The ID of the search index used for this test.
+   *
+   * @var string
+   */
+  protected $indexId;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = array('node', 'search_api', 'search_api_test_backend', 'language');
+
+  /**
+   * Tests indexing with different language settings trough the UI.
+   */
+  public function testIndexSettings() {
+    $this->drupalLogin($this->adminUser);
+
+    // Add extra languages.
+    ConfigurableLanguage::createFromLangcode('nl')->save();
+    ConfigurableLanguage::createFromLangcode('xx-lolspeak')->save();
+
+    // Create a test server and index.
+    $this->getTestServer();
+    $index = $this->getTestIndex();
+    $this->indexId = $index->id();
+
+    // Create 2 articles.
+    $article1 = $this->drupalCreateNode(array('type' => 'article'));
+    $article2 = $this->drupalCreateNode(array('type' => 'article'));
+
+    // Those 2 new nodes should be added to the tracking table immediately.
+    $tracked_items = $this->countTrackedItems();
+    $this->assertEqual($tracked_items, 2, 'Two items are tracked.');
+
+    // Add translations.
+    $article1->addTranslation('nl', array('title' => 'test NL', 'body' => 'NL body'))
+      ->save();
+    $article2->addTranslation('nl', array('title' => 'test2 NL', 'body' => 'NL body2'))
+      ->save();
+    $article1->addTranslation('xx-lolspeak', array('title' => 'cats', 'body' => 'Cats test'))
+      ->save();
+
+    // The translations should be tracked as well, so we have a total of 5
+    // indexed items.
+    $tracked_items = $this->countTrackedItems();
+    $this->assertEqual($tracked_items, 5, 'Five items are tracked.');
+
+    // Clear index.
+    $this->drupalGet($this->getIndexPath());
+    $this->drupalPostForm(NULL, array(), $this->t('Clear all indexed data'));
+    $this->drupalPostForm(NULL, array(), $this->t('Confirm'));
+
+    // Make sure all 5 items are successfully indexed.
+    $this->drupalGet($this->getIndexPath());
+    $this->drupalPostForm(NULL, array(), $this->t('Index now'));
+    $this->assertText($this->t('Successfully indexed 5 items'));
+
+    // Change the datasource to disallow indexing of dutch.
+    $form_values = array('datasource_configs[entity:node][languages][nl]' => 1);
+    $this->drupalGet($this->getIndexPath('edit'));
+    $this->drupalPostForm(NULL, $form_values, $this->t('Save'));
+    $this->assertResponse(200);
+    $this->assertText('The index was successfully saved.');
+
+    // Make sure that we only have 3 indexed items now. The 2 original nodes
+    // + 1 translation in lolspeak, the 2 dutch translations should be ignored.
+    $this->drupalGet($this->getIndexPath());
+    $this->drupalPostForm(NULL, array(), $this->t('Index now'));
+    $this->assertText($this->t('Successfully indexed 3 items'));
+
+    // Change the datasource to only allow indexing of dutch.
+    $form_values = array(
+      'datasource_configs[entity:node][default]' => 0,
+      'datasource_configs[entity:node][bundles][article]' => 1,
+      'datasource_configs[entity:node][languages][nl]' => 1,
+    );
+    $this->drupalGet($this->getIndexPath('edit'));
+    $this->drupalPostForm(NULL, $form_values, $this->t('Save'));
+    $this->assertResponse(200);
+    $this->assertText('The index was successfully saved.');
+
+    // Make sure that we only have 2 index items. The only indexed items should
+    // be the dutch translations.
+    $this->drupalGet($this->getIndexPath());
+    $this->drupalPostForm(NULL, array(), $this->t('Index now'));
+    $this->assertText($this->t('Successfully indexed 2 items'));
+  }
+
+  /**
+   * Counts the number of tracked items in the test index.
+   *
+   * @return int
+   *   The number of tracked items in the test index.
+   */
+  protected function countTrackedItems() {
+    /** @var \Drupal\search_api\IndexInterface $index */
+    $index = Index::load($this->indexId);
+    return $index->getTracker()->getTotalItemsCount();
+  }
+
+  /**
+   * Returns the system path for the test index.
+   *
+   * @param string|null $tab
+   *   (optional) If set, the path suffix for a specific index tab.
+   *
+   * @return string
+   *   A system path.
+   */
+  protected function getIndexPath($tab = NULL) {
+    $path = 'admin/config/search/search-api/index/' . $this->indexId;
+    if ($tab) {
+      $path .= "/$tab";
+    }
+    return $path;
+  }
+
+}