Use bulk insert. Still working on bulk update/delete which is not yet suppored in Elastica.

Doctrine/Listener.php

@@ -214,9 +214,10 @@ class Listener implements EventSubscriber
      */
     private function persistScheduled()
     {
-        foreach ($this->scheduledForInsertion as $entity) {
-            $this->objectPersister->insertOne($entity);
+        if (count($this->scheduledForInsertion)) {
+            $this->objectPersister->insertMany($this->scheduledForInsertion);
         }
+
         foreach ($this->scheduledForUpdate as $entity) {
             $this->objectPersister->replaceOne($entity);
         }

Tests/Doctrine/AbstractListenerTest.php

@@ -22,8 +22,8 @@ abstract class ListenerTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($entity, current($listener->scheduledForInsertion));
 
         $persister->expects($this->once())
-            ->method('insertOne')
-            ->with($entity);
+            ->method('insertMany')
+            ->with($listener->scheduledForInsertion);
 
         $listener->postFlush($eventArgs);
     }
@@ -46,6 +46,8 @@ abstract class ListenerTest extends \PHPUnit_Framework_TestCase
 
         $persister->expects($this->never())
             ->method('insertOne');
+        $persister->expects($this->never())
+            ->method('insertMany');
 
         $listener->postFlush($eventArgs);
     }