diff --git a/CHANGELOG-3.0.md b/CHANGELOG-3.0.md
index ecb5dad..70bd181 100644
--- a/CHANGELOG-3.0.md
+++ b/CHANGELOG-3.0.md
@@ -12,8 +12,9 @@ https://github.com/FriendsOfSymfony/FOSElasticaBundle/compare/v3.0.0...v3.0.1
 To generate a changelog summary since the last version, run
 `git log --no-merges --oneline v3.0.0...3.0.x`
 
-* 3.0.7 (Unreleased)
+* 3.0.7 (2015-01-21)
 
+ * Fixed the indexing of parent/child relations, broken since 3.0 #774
  * Fixed multi_field properties not being normalised #769
 
 * 3.0.6 (2015-01-04)
diff --git a/DependencyInjection/FOSElasticaExtension.php b/DependencyInjection/FOSElasticaExtension.php
index 529bd29..fe97542 100644
--- a/DependencyInjection/FOSElasticaExtension.php
+++ b/DependencyInjection/FOSElasticaExtension.php
@@ -396,7 +396,13 @@ class FOSElasticaExtension extends Extension
             $arguments[] = array(new Reference($callbackId), 'serialize');
         } else {
             $abstractId = 'fos_elastica.object_persister';
-            $arguments[] = $this->indexConfigs[$indexName]['types'][$typeName]['mapping']['properties'];
+            $mapping = $this->indexConfigs[$indexName]['types'][$typeName]['mapping'];
+            $argument = $mapping['properties'];
+            if(isset($mapping['_parent'])){
+                $argument['_parent'] = $mapping['_parent'];
+            }
+            $arguments[] = $argument;
+
         }
 
         $serviceId = sprintf('fos_elastica.object_persister.%s.%s', $indexName, $typeName);
diff --git a/Tests/DependencyInjection/FOSElasticaExtensionTest.php b/Tests/DependencyInjection/FOSElasticaExtensionTest.php
new file mode 100644
index 0000000..feb520f
--- /dev/null
+++ b/Tests/DependencyInjection/FOSElasticaExtensionTest.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace FOS\ElasticaBundle\Tests\DependencyInjection;
+
+use FOS\ElasticaBundle\DependencyInjection\FOSElasticaExtension;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\Yaml\Yaml;
+
+class FOSElasticaExtensionTest extends \PHPUnit_Framework_TestCase
+{
+    public function testShouldAddParentParamToObjectPersisterCall()
+    {
+        $config = Yaml::parse(file_get_contents(__DIR__.'/fixtures/config.yml'));
+
+        $containerBuilder = new ContainerBuilder;
+        $containerBuilder->setParameter('kernel.debug', true);
+
+        $extension = new FOSElasticaExtension;
+
+        $extension->load($config, $containerBuilder);
+
+        $this->assertTrue($containerBuilder->hasDefinition('fos_elastica.object_persister.test_index.child_field'));
+
+        $persisterCallDefinition = $containerBuilder->getDefinition('fos_elastica.object_persister.test_index.child_field');
+
+        $arguments = $persisterCallDefinition->getArguments();
+        $arguments = $arguments['index_3'];
+
+        $this->assertArrayHasKey('_parent', $arguments);
+        $this->assertEquals('parent_field', $arguments['_parent']['type']);
+    }
+}
diff --git a/Tests/DependencyInjection/fixtures/config.yml b/Tests/DependencyInjection/fixtures/config.yml
new file mode 100644
index 0000000..5528d18
--- /dev/null
+++ b/Tests/DependencyInjection/fixtures/config.yml
@@ -0,0 +1,21 @@
+fos_elastica:
+    clients:
+        default:
+            url: http://localhost:9200
+    indexes:
+        test_index:
+            client: default
+            types:
+                parent_field:
+                    mappings:
+                        text: ~
+                    persistence:
+                        driver: orm
+                        model: foo_model
+                child_field:
+                    mappings:
+                        text: ~
+                    persistence:
+                        driver: orm
+                        model: foo_model
+                    _parent: { type: "parent_field", property: "parent" }