diff --git a/Command/PopulateCommand.php b/Command/PopulateCommand.php
index ba6affd..53ee7ee 100755
--- a/Command/PopulateCommand.php
+++ b/Command/PopulateCommand.php
@@ -91,7 +91,7 @@ class PopulateCommand extends ContainerAwareCommand
     private function populateIndex(OutputInterface $output, $index, $reset)
     {
         if ($reset) {
-            $output->writeln(sprintf('Resetting: %s', $index));
+            $output->writeln(sprintf('<info>Resetting</info> <comment>%s</comment>', $index));
             $this->resetter->resetIndex($index);
         }
 
@@ -99,13 +99,13 @@ class PopulateCommand extends ContainerAwareCommand
 
         foreach ($providers as $type => $provider) {
             $loggerClosure = function($message) use ($output, $index, $type) {
-                $output->writeln(sprintf('Populating: %s/%s, %s', $index, $type, $message));
+                $output->writeln(sprintf('<info>Populating</info> %s/%s, %s', $index, $type, $message));
             };
 
             $provider->populate($loggerClosure);
         }
 
-        $output->writeln(sprintf('Refreshing: %s', $index));
+        $output->writeln(sprintf('<info>Refreshing</info> <comment>%s</comment>', $index));
         $this->indexManager->getIndex($index)->refresh();
     }
 
diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index ebd006c..6aa179d 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -45,9 +45,41 @@ class Configuration
                     ->useAttributeAsKey('id')
                     ->prototype('array')
                         ->performNoDeepMerging()
+                        ->beforeNormalization()
+                            ->ifTrue(function($v) { return isset($v['host']) && isset($v['port']); })
+                            ->then(function($v) {
+                                return array(
+                                    'servers' => array(
+                                        array(
+                                            'host' => $v['host'],
+                                            'port' => $v['port'],
+                                        )
+                                    )
+                                );
+                            })
+                        ->end()
+                        ->beforeNormalization()
+                            ->ifTrue(function($v) { return isset($v['url']); })
+                            ->then(function($v) {
+                                return array(
+                                    'servers' => array(
+                                        array(
+                                            'url' => $v['url'],
+                                        )
+                                    )
+                                );
+                            })
+                        ->end()
                         ->children()
-                            ->scalarNode('host')->defaultValue('localhost')->end()
-                            ->scalarNode('port')->defaultValue('9000')->end()
+                            ->arrayNode('servers')
+                                ->prototype('array')
+                                    ->children()
+                                        ->scalarNode('url')->end()
+                                        ->scalarNode('host')->end()
+                                        ->scalarNode('port')->end()
+                                    ->end()
+                                ->end()
+                            ->end()
                             ->scalarNode('timeout')->end()
                             ->scalarNode('headers')->end()
                         ->end()
@@ -214,6 +246,7 @@ class Configuration
                 ->end()
                 ->append($this->getMappingsNode())
                 ->append($this->getSourceNode())
+                ->append($this->getBoostNode())
             ->end()
         ;
 
@@ -265,6 +298,33 @@ class Configuration
                             ->end()
                         ->end()
                     ->end()
+                    ->arrayNode('_parent')
+                        ->treatNullLike(array())
+                        ->children()
+                            ->scalarNode('type')->end()
+                            ->scalarNode('identifier')->defaultValue('id')->end()
+                        ->end()
+                    ->end()
+                    ->arrayNode('properties')
+                        ->useAttributeAsKey('name')
+                        ->prototype('array')
+                            ->treatNullLike(array())
+                            ->addDefaultsIfNotSet()
+                            ->children()
+                                ->scalarNode('type')->defaultValue('string')->end()
+                                ->scalarNode('boost')->end()
+                                ->scalarNode('store')->end()
+                                ->scalarNode('index')->end()
+                                ->scalarNode('index_analyzer')->end()
+                                ->scalarNode('search_analyzer')->end()
+                                ->scalarNode('analyzer')->end()
+                                ->scalarNode('term_vector')->end()
+                                ->scalarNode('null_value')->end()
+                                ->booleanNode('include_in_all')->defaultValue('true')->end()
+                                ->scalarNode('lat_lon')->end()
+                            ->end()
+                        ->end()
+                    ->end()
                 ->end()
             ->end()
         ;
@@ -295,4 +355,22 @@ class Configuration
 
         return $node;
     }
+
+    /**
+     * Returns the array node used for "_boost".
+     */
+    protected function getBoostNode()
+    {
+        $builder = new TreeBuilder();
+        $node = $builder->root('_boost');
+
+        $node
+            ->children()
+                ->scalarNode('name')->end()
+                ->scalarNode('null_value')->end()
+            ->end()
+        ;
+
+        return $node;
+    }
 }
diff --git a/DependencyInjection/FOQElasticaExtension.php b/DependencyInjection/FOQElasticaExtension.php
index 12658ba..92310cc 100644
--- a/DependencyInjection/FOQElasticaExtension.php
+++ b/DependencyInjection/FOQElasticaExtension.php
@@ -170,6 +170,9 @@ class FOQElasticaExtension extends Extension
             if (isset($type['_source'])) {
                 $this->indexConfigs[$indexName]['config']['mappings'][$name]['_source'] = $type['_source'];
             }
+            if (isset($type['_boost'])) {
+                $this->indexConfigs[$indexName]['config']['mappings'][$name]['_boost'] = $type['_boost'];
+            }
             if (isset($type['mappings'])) {
                 $this->indexConfigs[$indexName]['config']['mappings'][$name]['properties'] = $type['mappings'];
                 $typeName = sprintf('%s/%s', $indexName, $name);
@@ -184,6 +187,9 @@ class FOQElasticaExtension extends Extension
             if (isset($type['search_analyzer'])) {
                 $this->indexConfigs[$indexName]['config']['mappings'][$name]['search_analyzer'] = $type['search_analyzer'];
             }
+            if (isset($type['index'])) {
+                $this->indexConfigs[$indexName]['config']['mappings'][$name]['index'] = $type['index'];
+            }
         }
     }
 
@@ -317,7 +323,7 @@ class FOQElasticaExtension extends Extension
         $listenerDef->replaceArgument(2, $this->getDoctrineEvents($typeConfig));
         switch ($typeConfig['driver']) {
             case 'orm': $listenerDef->addTag('doctrine.event_subscriber'); break;
-            case 'mongodb': $listenerDef->addTag('doctrine.odm.mongodb.event_subscriber'); break;
+            case 'mongodb': $listenerDef->addTag('doctrine_mongodb.odm.event_subscriber'); break;
         }
         if (isset($typeConfig['listener']['is_indexable_callback'])) {
             $callback = $typeConfig['listener']['is_indexable_callback'];
diff --git a/Doctrine/AbstractElasticaToModelTransformer.php b/Doctrine/AbstractElasticaToModelTransformer.php
index 8774106..9a74cfa 100755
--- a/Doctrine/AbstractElasticaToModelTransformer.php
+++ b/Doctrine/AbstractElasticaToModelTransformer.php
@@ -111,6 +111,14 @@ abstract class AbstractElasticaToModelTransformer implements ElasticaToModelTran
         return $result;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getIdentifierField()
+    {
+        return $this->options['identifier'];
+    }
+
     /**
      * Fetches objects by theses identifier values
      *
diff --git a/Doctrine/AbstractProvider.php b/Doctrine/AbstractProvider.php
index 8f51e57..6a3e008 100644
--- a/Doctrine/AbstractProvider.php
+++ b/Doctrine/AbstractProvider.php
@@ -40,7 +40,6 @@ abstract class AbstractProvider extends BaseAbstractProvider
             if ($loggerClosure) {
                 $stepStartTime = microtime(true);
             }
-
             $objects = $this->fetchSlice($queryBuilder, $this->options['batch_size'], $offset);
 
             $this->objectPersister->insertMany($objects);
diff --git a/Paginator/RawPaginatorAdapter.php b/Paginator/RawPaginatorAdapter.php
index e2f9fb5..77d0527 100644
--- a/Paginator/RawPaginatorAdapter.php
+++ b/Paginator/RawPaginatorAdapter.php
@@ -65,6 +65,6 @@ class RawPaginatorAdapter implements PaginatorAdapterInterface
      */
     public function getTotalHits()
     {
-        return $this->searchable->count($this->query);
+        return $this->searchable->search($this->query)->getTotalHits();
     }
 }
diff --git a/Propel/ElasticaToModelTransformer.php b/Propel/ElasticaToModelTransformer.php
index 16499c6..824b523 100644
--- a/Propel/ElasticaToModelTransformer.php
+++ b/Propel/ElasticaToModelTransformer.php
@@ -100,6 +100,14 @@ class ElasticaToModelTransformer implements ElasticaToModelTransformerInterface
         return $this->objectClass;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getIdentifierField()
+    {
+        return $this->options['identifier'];
+    }
+
     /**
      * Fetch objects for theses identifier values
      *
diff --git a/README.md b/README.md
index f472e5a..774e7ec 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,41 @@ Elasticsearch type is comparable to Doctrine entity repository.
 
 Our type is now available as a service: `foq_elastica.index.website.user`. It is an instance of `Elastica_Type`.
 
+### Declaring parent field
+
+    foq_elastica:
+        clients:
+            default: { host: localhost, port: 9200 }
+        indexes:
+            website:
+                client: default
+                types:
+                    comment:
+                        mappings:
+                            post: {_parent: { type: "post", identifier: "id" } }
+                            date: { boost: 5 }
+                            content: ~
+
+### Declaring `nested` or `object`
+
+    foq_elastica:
+        clients:
+            default: { host: localhost, port: 9200 }
+        indexes:
+            website:
+                client: default
+                types:
+                    post:
+                        mappings:
+                            date: { boost: 5 }
+                            title: { boost: 3 }
+                            content: ~
+                            comments:
+                                type: "nested"
+                                properties:
+                                    date: { boost: 5 }
+                                    content: ~
+
 ### Populate the types
 
     php app/console foq:elastica:populate
diff --git a/Resetter.php b/Resetter.php
index f8d94ed..2773140 100644
--- a/Resetter.php
+++ b/Resetter.php
@@ -58,7 +58,27 @@ class Resetter
 
         $type = $indexConfig['index']->getType($typeName);
         $type->delete();
-        $type->setMapping($indexConfig['config']['mappings'][$typeName]['properties']);
+        $mapping = $this->createMapping($indexConfig['config']['mappings'][$typeName]);
+        $type->setMapping($mapping);
+    }
+
+    /**
+     * create type mapping object
+     *
+     * @param array $indexConfig
+     * @return Elastica_Type_Mapping
+     */
+    protected function createMapping($indexConfig)
+    {
+		$mapping = \Elastica_Type_Mapping::create($indexConfig['properties']);
+
+        foreach($indexConfig['properties'] as $field => $type) {
+            if (!empty($type['_parent']) && $type['_parent'] !== '~') {
+                $mapping->setParam('_parent', array('type' => $type['_parent']['type']));
+            }
+        }
+
+        return $mapping;
     }
 
     /**
diff --git a/Resources/config/config.xml b/Resources/config/config.xml
index 95c5406..b6b9c92 100644
--- a/Resources/config/config.xml
+++ b/Resources/config/config.xml
@@ -61,7 +61,6 @@
 
         <service id="foq_elastica.elastica_to_model_transformer.collection.prototype" class="%foq_elastica.elastica_to_model_transformer.collection.class%" public="true" abstract="true">
             <argument type="collection" /> <!-- transformers -->
-            <argument type="collection" /> <!-- options -->
         </service>
 
         <service id="foq_elastica.provider_registry" class="%foq_elastica.provider_registry.class%">
diff --git a/Tests/ResetterTest.php b/Tests/ResetterTest.php
index d59da18..754310c 100644
--- a/Tests/ResetterTest.php
+++ b/Tests/ResetterTest.php
@@ -29,6 +29,17 @@ class ResetterTest extends \PHPUnit_Framework_TestCase
                     ),
                 ),
             ),
+            'parent' => array(
+                'index' => $this->getMockElasticaIndex(),
+                'config' => array(
+                    'mappings' => array(
+                        'a' => array('properties' => array(
+                                'field_1' => array('_parent' => array('type' => 'b', 'identifier' => 'id')),
+                                'field_2' => array())),
+                        'b' => array('properties' => array()),
+                    ),
+                ),
+            ),
         );
     }
 
@@ -80,9 +91,10 @@ class ResetterTest extends \PHPUnit_Framework_TestCase
         $type->expects($this->once())
             ->method('delete');
 
+        $mapping = \Elastica_Type_Mapping::create($this->indexConfigsByName['foo']['config']['mappings']['a']['properties']);
         $type->expects($this->once())
             ->method('setMapping')
-            ->with($this->indexConfigsByName['foo']['config']['mappings']['a']['properties']);
+            ->with($mapping);
 
         $resetter = new Resetter($this->indexConfigsByName);
         $resetter->resetIndexType('foo', 'a');
@@ -106,6 +118,28 @@ class ResetterTest extends \PHPUnit_Framework_TestCase
         $resetter->resetIndexType('foo', 'c');
     }
 
+    public function testIndexMappingForParent()
+    {
+        $type = $this->getMockElasticaType();
+
+        $this->indexConfigsByName['parent']['index']->expects($this->once())
+            ->method('getType')
+            ->with('a')
+            ->will($this->returnValue($type));
+
+        $type->expects($this->once())
+            ->method('delete');
+
+        $mapping = \Elastica_Type_Mapping::create($this->indexConfigsByName['parent']['config']['mappings']['a']['properties']);
+        $mapping->setParam('_parent', array('type' => 'b'));
+        $type->expects($this->once())
+            ->method('setMapping')
+            ->with($mapping);
+
+        $resetter = new Resetter($this->indexConfigsByName);
+        $resetter->resetIndexType('parent', 'a');
+    }
+
     /**
      * @return Elastica_Index
      */
diff --git a/Tests/Transformer/ElasticaToModelTransformerCollectionTest.php b/Tests/Transformer/ElasticaToModelTransformerCollectionTest.php
index e739959..05ddaaa 100644
--- a/Tests/Transformer/ElasticaToModelTransformerCollectionTest.php
+++ b/Tests/Transformer/ElasticaToModelTransformerCollectionTest.php
@@ -19,11 +19,19 @@ class ElasticaToModelTransformerCollectionTest extends \PHPUnit_Framework_TestCa
             ->method('getObjectClass')
             ->will($this->returnValue('FOQ\ElasticaBundle\Tests\Transformer\POPO'));
 
+        $transformer1->expects($this->any())
+            ->method('getIdentifierField')
+            ->will($this->returnValue('id'));
+
         $transformer2 = $this->getMock('FOQ\ElasticaBundle\Transformer\ElasticaToModelTransformerInterface');
         $transformer2->expects($this->any())
             ->method('getObjectClass')
             ->will($this->returnValue('FOQ\ElasticaBundle\Tests\Transformer\POPO2'));
 
+        $transformer2->expects($this->any())
+            ->method('getIdentifierField')
+            ->will($this->returnValue('id'));
+
         $this->collection = new ElasticaToModelTransformerCollection($this->transformers = array(
             'type1' => $transformer1,
             'type2' => $transformer2,
diff --git a/Tests/Transformer/ModelToElasticaAutoTransformerTest.php b/Tests/Transformer/ModelToElasticaAutoTransformerTest.php
index 7f2595c..6f2aaea 100644
--- a/Tests/Transformer/ModelToElasticaAutoTransformerTest.php
+++ b/Tests/Transformer/ModelToElasticaAutoTransformerTest.php
@@ -92,6 +92,19 @@ class POPO
     {
         return $this->file;
     }
+
+    public function getSub()
+    {
+        return array(
+            (object) array('foo' => 'foo', 'bar' => 'foo', 'id' => 1),
+            (object) array('foo' => 'bar', 'bar' => 'bar', 'id' => 2),
+        );
+    }
+
+    public function getUpper()
+    {
+        return (object) array('id' => 'parent', 'name' => 'a random name');
+    }
 }
 
 class ModelToElasticaAutoTransformerTest extends \PHPUnit_Framework_TestCase
@@ -215,4 +228,66 @@ class ModelToElasticaAutoTransformerTest extends \PHPUnit_Framework_TestCase
             base64_encode(file_get_contents(__DIR__ . '/../fixtures/attachment.odt')), $data['fileContents']
         );
     }
+
+    public function testNestedMapping()
+    {
+        $transformer = new ModelToElasticaAutoTransformer();
+        $document    = $transformer->transform(new POPO(), array(
+                'sub' => array(
+                    'type' => 'nested',
+                    'properties' => array('foo' => '~')
+                    )
+                ));
+        $data        = $document->getData();
+
+        $this->assertTrue(array_key_exists('sub', $data));
+        $this->assertInternalType('array', $data['sub']);
+        $this->assertEquals(array(
+             array('foo' => 'foo'),
+             array('foo' => 'bar')
+           ), $data['sub']);
+    }
+
+    public function tesObjectMapping()
+    {
+        $transformer = new ModelToElasticaAutoTransformer();
+        $document    = $transformer->transform(new POPO(), array(
+                'sub' => array(
+                    'type' => 'object',
+                    'properties' => array('bar')
+                    )
+                ));
+        $data        = $document->getData();
+
+        $this->assertTrue(array_key_exists('sub', $data));
+        $this->assertInternalType('array', $data['sub']);
+        $this->assertEquals(array(
+             array('bar' => 'foo'),
+             array('bar' => 'bar')
+           ), $data['sub']);
+    }
+
+    public function testParentMapping()
+    {
+        $transformer = new ModelToElasticaAutoTransformer();
+        $document    = $transformer->transform(new POPO(), array(
+                'upper' => array(
+                    '_parent' => array('type' => 'upper', 'identifier' => 'id'),
+                    )
+                ));
+
+        $this->assertEquals("parent", $document->getParent());
+    }
+
+    public function testParentMappingWithCustomIdentifier()
+    {
+        $transformer = new ModelToElasticaAutoTransformer();
+        $document    = $transformer->transform(new POPO(), array(
+                'upper' => array(
+                    '_parent' => array('type' => 'upper', 'identifier' => 'name'),
+                    )
+                ));
+
+        $this->assertEquals("a random name", $document->getParent());
+    }
 }
diff --git a/Transformer/ElasticaToModelTransformerCollection.php b/Transformer/ElasticaToModelTransformerCollection.php
index 2418e2e..539f03d 100644
--- a/Transformer/ElasticaToModelTransformerCollection.php
+++ b/Transformer/ElasticaToModelTransformerCollection.php
@@ -13,14 +13,10 @@ use Symfony\Component\Form\Util\PropertyPath;
 class ElasticaToModelTransformerCollection implements ElasticaToModelTransformerInterface
 {
     protected $transformers = array();
-    protected $options = array(
-        'identifier' => 'id'
-    );
 
-    public function __construct(array $transformers, array $options)
+    public function __construct(array $transformers)
     {
         $this->transformers = $transformers;
-        $this->options = array_merge($this->options, $options);
     }
 
     public function getObjectClass()
@@ -30,6 +26,16 @@ class ElasticaToModelTransformerCollection implements ElasticaToModelTransformer
         }, $this->transformers);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getIdentifierField()
+    {
+        return array_map(function ($transformer) {
+            return $transformer->getIdentifierField();
+        }, $this->transformers);
+    }
+
     public function transform(array $elasticaObjects)
     {
         $sorted = array();
@@ -37,12 +43,19 @@ class ElasticaToModelTransformerCollection implements ElasticaToModelTransformer
             $sorted[$object->getType()][] = $object;
         }
 
-        $identifierProperty = new PropertyPath($this->options['identifier']);
-
         $transformed = array();
         foreach ($sorted AS $type => $objects) {
             $transformedObjects = $this->transformers[$type]->transform($objects);
-            $transformed[$type] = array_combine(array_map(function($o) use ($identifierProperty) {return $identifierProperty->getValue($o);},$transformedObjects),$transformedObjects);
+            $identifierGetter = 'get' . ucfirst($this->transformers[$type]->getIdentifierField());
+            $transformed[$type] = array_combine(
+                array_map(
+                    function($o) use ($identifierGetter) {
+                        return $o->$identifierGetter();
+                    },
+                    $transformedObjects
+                ),
+                $transformedObjects
+            );
         }
 
         $result = array();
@@ -71,4 +84,4 @@ class ElasticaToModelTransformerCollection implements ElasticaToModelTransformer
             return $transformer->getObjectClass();
         }, $this->transformers);
     }
-}
\ No newline at end of file
+}
diff --git a/Transformer/ElasticaToModelTransformerInterface.php b/Transformer/ElasticaToModelTransformerInterface.php
index 5f3f5aa..971bdfe 100644
--- a/Transformer/ElasticaToModelTransformerInterface.php
+++ b/Transformer/ElasticaToModelTransformerInterface.php
@@ -24,4 +24,11 @@ interface ElasticaToModelTransformerInterface
      * @return string
      */
     function getObjectClass();
+
+    /**
+     * Returns the identifier field from the options
+     *
+     * @return string the identifier field
+     */
+    function getIdentifierField();
 }
diff --git a/Transformer/ModelToElasticaAutoTransformer.php b/Transformer/ModelToElasticaAutoTransformer.php
index df72d6f..aa649e2 100644
--- a/Transformer/ModelToElasticaAutoTransformer.php
+++ b/Transformer/ModelToElasticaAutoTransformer.php
@@ -45,7 +45,15 @@ class ModelToElasticaAutoTransformer implements ModelToElasticaTransformerInterf
         $document           = new \Elastica_Document($identifier);
         foreach ($fields as $key => $mapping) {
             $property = new PropertyPath($key);
-            if (isset($mapping['type']) && $mapping['type'] == 'attachment') {
+            if (!empty($mapping['_parent']) && $mapping['_parent'] !== '~') {
+                $parent             = $property->getValue($object);
+                $identifierProperty = new PropertyPath($mapping['_parent']['identifier']);
+                $document->setParent($identifierProperty->getValue($parent));
+            } else if (isset($mapping['type']) && in_array($mapping['type'], array('nested', 'object'))) {
+                $submapping     = $mapping['properties'];
+                $subcollection  = $property->getValue($object);
+                $document->add($key, $this->transformNested($subcollection, $submapping, $document));
+            } else if (isset($mapping['type']) && $mapping['type'] == 'attachment') {
                 $attachment = $property->getValue($object);
                 if ($attachment instanceof \SplFileInfo) {
                     $document->addFile($key, $attachment->getPathName());
@@ -59,6 +67,25 @@ class ModelToElasticaAutoTransformer implements ModelToElasticaTransformerInterf
         return $document;
     }
 
+    /**
+     * transform a nested document or an object property into an array of ElasticaDocument
+     *
+     * @param array $objects    the object to convert
+     * @param array $fields     the keys we want to have in the returned array
+     * @param Elastica_Document $parent the parent document
+     * @return array
+     */
+    protected function transformNested($objects, array $fields, $parent)
+    {
+        $documents = array();
+        foreach($objects as $object) {
+            $document = $this->transform($object, $fields);
+            $documents[] = $document->getData();
+        }
+
+        return $documents;
+    }
+
     /**
      * Attempts to convert any type to a string or an array of strings
      *
diff --git a/composer.json b/composer.json
index f7efcf4..ad0b1fe 100644
--- a/composer.json
+++ b/composer.json
@@ -12,9 +12,9 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "symfony/framework-bundle": "2.1.*",
-        "symfony/console": "2.1.*",
-        "symfony/form": "2.1.*",
+        "symfony/framework-bundle": ">=2.1.0,<2.3-dev",
+        "symfony/console": ">=2.1.0,<2.3-dev",
+        "symfony/form": ">=2.1.0,<2.3-dev",
         "ruflin/elastica": "0.19.8"
     },
     "require-dev":{