diff --git a/src/Plugin/views/filter/SearchApiFulltext.php b/src/Plugin/views/filter/SearchApiFulltext.php
index f76c381..72d065f 100644
--- a/src/Plugin/views/filter/SearchApiFulltext.php
+++ b/src/Plugin/views/filter/SearchApiFulltext.php
@@ -233,9 +233,10 @@ class SearchApiFulltext extends SearchApiFilterText {
    */
   protected function getFulltextFields() {
     $fields = array();
+    /** @var \Drupal\search_api\IndexInterface $index */
     $index = Index::load(substr($this->table, 17));
 
-    $fields_info = $index->getFields();
+    $fields_info = $index->getCachedFields();
     foreach ($index->getFulltextFields() as $field_id) {
       $fields[$field_id] = $fields_info[$field_id]->getPrefixedLabel();
     }
diff --git a/tests/src/Unit/Plugin/Processor/AggregatedFieldTest.php b/tests/src/Unit/Plugin/Processor/AggregatedFieldTest.php
index 0cc675b..085e541 100644
--- a/tests/src/Unit/Plugin/Processor/AggregatedFieldTest.php
+++ b/tests/src/Unit/Plugin/Processor/AggregatedFieldTest.php
@@ -441,7 +441,7 @@ class AggregatedFieldTest extends UnitTestCase {
       $index_fields[$field_id] = $field_object;
     }
     $this->index->expects($this->any())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue($index_fields));
 
     $configuration['fields'] = array(
diff --git a/tests/src/Unit/Plugin/Processor/FieldsProcessorPluginBaseTest.php b/tests/src/Unit/Plugin/Processor/FieldsProcessorPluginBaseTest.php
index cd3fd8b..1fd7df6 100644
--- a/tests/src/Unit/Plugin/Processor/FieldsProcessorPluginBaseTest.php
+++ b/tests/src/Unit/Plugin/Processor/FieldsProcessorPluginBaseTest.php
@@ -50,7 +50,7 @@ class FieldsProcessorPluginBaseTest extends UnitTestCase {
       ->will($this->returnValue(TRUE));
     $fields = $this->getTestItem()[$this->itemIds[0]]->getFields();
     $this->index->expects($this->any())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue($fields));
 
     $this->processor = new TestFieldsProcessorPlugin(array('index' => $this->index), '', array());
diff --git a/tests/src/Unit/Plugin/Processor/HighlightTest.php b/tests/src/Unit/Plugin/Processor/HighlightTest.php
index 2cc02fa..b2fe480 100644
--- a/tests/src/Unit/Plugin/Processor/HighlightTest.php
+++ b/tests/src/Unit/Plugin/Processor/HighlightTest.php
@@ -119,7 +119,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -165,7 +165,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -211,7 +211,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -255,7 +255,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -304,7 +304,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -350,7 +350,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -398,7 +398,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -446,7 +446,7 @@ class HighlightTest extends UnitTestCase {
     $field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $field)));
 
     $this->processor->setIndex($index);
@@ -506,7 +506,7 @@ class HighlightTest extends UnitTestCase {
     $body_field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $body_field)));
 
     $this->processor->setIndex($index);
@@ -556,7 +556,7 @@ class HighlightTest extends UnitTestCase {
     $title_field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $body_field, $title_field_id => $title_field)));
 
     $this->processor->setIndex($index);
@@ -610,7 +610,7 @@ class HighlightTest extends UnitTestCase {
     $body_field->setType('text');
 
     $index->expects($this->atLeastOnce())
-      ->method('getFields')
+      ->method('getCachedFields')
       ->will($this->returnValue(array($body_field_id => $body_field)));
 
     $this->processor->setIndex($index);