diff --git a/src/Entity/Index.php b/src/Entity/Index.php
index c06b47f..9e8990b 100644
--- a/src/Entity/Index.php
+++ b/src/Entity/Index.php
@@ -138,7 +138,7 @@ class Index extends ConfigEntityBase implements IndexInterface {
    *
    * @see getDatasources()
    */
-  protected $datasourcePlugins;
+  protected $datasourceInstances;
 
   /**
    * The tracker settings
@@ -313,20 +313,20 @@ class Index extends ConfigEntityBase implements IndexInterface {
    * {@inheritdoc}
    */
   public function getDatasources($only_enabled = TRUE) {
-    if (!isset($this->datasourcePlugins)) {
-      $this->datasourcePlugins = array();
+    if (!isset($this->datasourceInstances)) {
+      $this->datasourceInstances = array();
       /** @var $datasource_plugin_manager \Drupal\search_api\Datasource\DatasourcePluginManager */
       $datasource_plugin_manager = \Drupal::service('plugin.manager.search_api.datasource');
 
       foreach ($datasource_plugin_manager->getDefinitions() as $name => $datasource_definition) {
-        if (class_exists($datasource_definition['class']) && empty($this->datasourcePlugins[$name])) {
+        if (class_exists($datasource_definition['class']) && empty($this->datasourceInstances[$name])) {
           // Create our settings for this datasource.
           $config = isset($this->datasource_settings[$name]) ? $this->datasource_settings[$name]['settings'] : array();
           $config += array('index' => $this);
 
           /** @var $datasource \Drupal\search_api\Datasource\DatasourceInterface */
           $datasource = $datasource_plugin_manager->createInstance($name, $config);
-          $this->datasourcePlugins[$name] = $datasource;
+          $this->datasourceInstances[$name] = $datasource;
         }
         elseif (!class_exists($datasource_definition['class'])) {
           \Drupal::logger('search_api')->warning('Datasource @id specifies a non-existing @class.', array('@id' => $name, '@class' => $datasource_definition['class']));
@@ -336,10 +336,10 @@ class Index extends ConfigEntityBase implements IndexInterface {
 
     // Filter datasources by status if required.
     if (!$only_enabled) {
-      return $this->datasourcePlugins;
+      return $this->datasourceInstances;
     }
 
-    return array_intersect_key($this->datasourcePlugins, array_flip(array_keys($this->datasource_settings)));
+    return array_intersect_key($this->datasourceInstances, array_flip(array_keys($this->datasource_settings)));
   }
 
   /**
@@ -1011,7 +1011,7 @@ class Index extends ConfigEntityBase implements IndexInterface {
    * {@inheritdoc}
    */
   public function resetCaches($include_stored = TRUE) {
-    $this->datasourcePlugins = NULL;
+    $this->datasourceInstances = NULL;
     $this->trackerInstance = NULL;
     $this->serverInstance = NULL;
     $this->processorPlugins = NULL;