diff --git a/lib/Alchemy/Phrasea/Model/Entities/ElasticsearchRecord.php b/lib/Alchemy/Phrasea/Model/Entities/ElasticsearchRecord.php
index 0b5f3c4617..6733c89c8d 100644
--- a/lib/Alchemy/Phrasea/Model/Entities/ElasticsearchRecord.php
+++ b/lib/Alchemy/Phrasea/Model/Entities/ElasticsearchRecord.php
@@ -11,9 +11,8 @@
 
 namespace Alchemy\Phrasea\Model\Entities;
 
-use Doctrine\Common\Collections\ArrayCollection;
-use Alchemy\Phrasea\Model\RecordInterface;
 use Alchemy\Phrasea\Model\MutableRecordInterface;
+use Alchemy\Phrasea\Model\RecordInterface;
 
 /**
  * Record entity from elastic search
@@ -26,7 +25,7 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
     private $baseId;
     private $collectionName;
     private $mimeType;
-    private $title;
+    private $title = [];
     private $originalName;
     private $updated;
     private $created;
@@ -36,16 +35,11 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
     private $type;
     private $status;
     private $isStory;
-    /** @var ArrayCollection */
-    private $caption;
-    /** @var ArrayCollection */
-    private $exif;
-    /** @var ArrayCollection */
-    private $subdefs;
-    /** @var ArrayCollection */
-    private $flags;
-    /** @var ArrayCollection */
-    private $highlight;
+    private $caption = [];
+    private $exif = [];
+    private $subdefs = [];
+    private $flags = [];
+    private $highlight = [];
 
     /** {@inheritdoc} */
     public function getId()
@@ -110,7 +104,7 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
     /** {@inheritdoc} */
     public function setIsStory($isStory)
     {
-        $this->isStory = (bool) $isStory;
+        $this->isStory = (bool)$isStory;
     }
 
     /** {@inheritdoc} */
@@ -187,12 +181,12 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
      */
     public function getTitle($locale = null)
     {
-        if ($locale && $this->title->containsKey($locale)) {
-            return $this->title->get($locale);
+        if ($locale && isset($this->title[$locale])) {
+            return $this->title[$locale];
         }
 
-        if ($this->title->containsKey('default')) {
-            return $this->title->get('default');
+        if (isset($this->title['default'])) {
+            return $this->title['default'];
         }
 
         return $this->getOriginalName();
@@ -201,9 +195,9 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
     /**
      * Sets a collection of titles
      *
-     * @param ArrayCollection $titles
+     * @param string[] $titles
      */
-    public function setTitles(ArrayCollection $titles)
+    public function setTitles(array $titles)
     {
         $this->title = $titles;
     }
@@ -242,45 +236,41 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
         $this->uuid = $uuid;
     }
 
-    /** @return ArrayCollection */
+    /** @return array */
     public function getCaption()
     {
         return $this->caption;
     }
 
-    public function setCaption(ArrayCollection $caption)
+    public function setCaption(array $caption)
     {
         $this->caption = $caption;
     }
 
-    /** @return ArrayCollection */
+    /** @return array */
     public function getExif()
     {
         return $this->exif;
     }
 
-    /**
-     * @param mixed $exif
-     */
-    public function setExif(ArrayCollection $exif)
+    public function setExif(array $exif)
     {
         $this->exif = $exif;
     }
 
-    /** @return ArrayCollection */
+    /** @return array */
     public function getSubdefs()
     {
         return $this->subdefs;
     }
 
-    /** @return ArrayCollection */
-    public function setSubdefs(ArrayCollection $subdefs)
+    public function setSubdefs(array $subdefs)
     {
         $this->subdefs = $subdefs;
     }
 
     /**
-     * @return ArrayCollection
+     * @return array
      */
     public function getFlags()
     {
@@ -288,9 +278,9 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
     }
 
     /**
-     * @param ArrayCollection $flags
+     * @param array $flags
      */
-    public function setFlags(ArrayCollection $flags)
+    public function setFlags(array $flags)
     {
         $this->flags = $flags;
     }
@@ -323,7 +313,7 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
     }
 
     /**
-     * @return ArrayCollection
+     * @return array
      */
     public function getHighlight()
     {
@@ -331,9 +321,9 @@ class ElasticsearchRecord implements RecordInterface, MutableRecordInterface
     }
 
     /**
-     * @param ArrayCollection $highlight
+     * @param array $highlight
      */
-    public function setHighlight(ArrayCollection $highlight)
+    public function setHighlight(array $highlight)
     {
         $this->highlight = $highlight;
     }
diff --git a/lib/Alchemy/Phrasea/Model/RecordInterface.php b/lib/Alchemy/Phrasea/Model/RecordInterface.php
index 5907d60d34..c542b5afc3 100644
--- a/lib/Alchemy/Phrasea/Model/RecordInterface.php
+++ b/lib/Alchemy/Phrasea/Model/RecordInterface.php
@@ -58,9 +58,9 @@ interface RecordInterface
     /** @return integer */
     public function getStatusBitField();
 
-    /** @return ArrayCollection */
+    /** @return array */
     public function getExif();
 
-    /** @return ArrayCollection */
+    /** @return array */
     public function getCaption();
 }
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchRecordHydrator.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchRecordHydrator.php
index 7f553439bf..33f1038b56 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchRecordHydrator.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchRecordHydrator.php
@@ -41,12 +41,12 @@ class ElasticsearchRecordHydrator
         $record->setUpdated($updatedOn ? new \DateTime($updatedOn) : $updatedOn);
         $record->setUuid(igorw\get_in($data, ['uuid'], ''));
         $record->setStatusBitField(igorw\get_in($data, ['flags_bitfield'], 0));
-        $record->setTitles(new ArrayCollection((array) igorw\get_in($data, ['title'], [])));
-        $record->setCaption(new ArrayCollection((array) igorw\get_in($data, ['caption'], [])));
-        $record->setExif(new ArrayCollection((array) igorw\get_in($data, ['exif'], [])));
-        $record->setSubdefs(new ArrayCollection((array) igorw\get_in($data, ['subdefs'], [])));
-        $record->setFlags(new ArrayCollection((array) igorw\get_in($data, ['flags'], [])));
-        $record->setHighlight(new ArrayCollection($highlight));
+        $record->setTitles((array) igorw\get_in($data, ['title'], []));
+        $record->setCaption((array) igorw\get_in($data, ['caption'], []));
+        $record->setExif((array) igorw\get_in($data, ['exif'], []));
+        $record->setSubdefs((array) igorw\get_in($data, ['subdefs'], []));
+        $record->setFlags((array) igorw\get_in($data, ['flags'], []));
+        $record->setHighlight((array) $highlight);
 
         return $record;
     }
diff --git a/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php b/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
index 8c2fbacbf6..f3f68d1f01 100644
--- a/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
+++ b/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
@@ -2,10 +2,10 @@
 
 namespace Alchemy\Phrasea\Twig;
 
+use Alchemy\Phrasea\Application;
 use Alchemy\Phrasea\Model\Entities\ElasticsearchRecord;
 use Alchemy\Phrasea\Model\Entities\User;
 use Alchemy\Phrasea\Model\RecordInterface;
-use Silex\Application;
 
 class PhraseanetExtension extends \Twig_Extension
 {
@@ -49,11 +49,12 @@ class PhraseanetExtension extends \Twig_Extension
         if ($record instanceof ElasticsearchRecord) {
             $highlightKey = sprintf('caption.%s', $field);
 
-            if (false === $record->getHighlight()->containsKey($highlightKey)) {
+            $highlights = $record->getHighlight();
+            if (false === isset($highlights[$highlightKey])) {
                 return implode('; ', (array) $value);
             }
 
-            $highlightValue = $record->getHighlight()->get($highlightKey);
+            $highlightValue = $highlights[$highlightKey];
 
             // if field is multivalued, merge highlighted values with captions ones
             if (is_array($value)) {
@@ -71,7 +72,9 @@ class PhraseanetExtension extends \Twig_Extension
     public function getRecordFlags(RecordInterface $record)
     {
         $recordStatuses = [];
-        $databox = $this->app['phraseanet.appbox']->get_databox($record->getDataboxId());
+        /** @var \appbox $appbox */
+        $appbox = $this->app['phraseanet.appbox'];
+        $databox = $appbox->get_databox($record->getDataboxId());
 
         $structure = $databox->getStatusStructure()->toArray();
 
@@ -207,8 +210,9 @@ class PhraseanetExtension extends \Twig_Extension
     public function getSubdefUrl(RecordInterface $record, $subdefName)
     {
         if ($record instanceof ElasticsearchRecord) {
-            if ($record->getSubdefs()->containsKey($subdefName)) {
-                $thumbnail = $record->getSubdefs()->get($subdefName);
+            $subdefs = $record->getSubdefs();
+            if (isset($subdefs[$subdefName])) {
+                $thumbnail = $subdefs[$subdefName];
                 if (null !== $path = $thumbnail['path']) {
                     if (is_string($path) && '' !== $path) {
                         return $this->app['phraseanet.static-file']->getUrl($path);
diff --git a/lib/classes/record/adapter.php b/lib/classes/record/adapter.php
index cbd592b924..054449bf1e 100644
--- a/lib/classes/record/adapter.php
+++ b/lib/classes/record/adapter.php
@@ -765,14 +765,15 @@ class record_adapter implements RecordInterface, cache_cacheableInterface
 
     public function getCaption()
     {
-        $collection = new ArrayCollection();
+        $collection = [];
 
+        /** @var caption_field $field */
         foreach ($this->get_caption()->get_fields() as $field) {
-            $values = array_map(function($fieldValue) {
+            $values = array_map(function(caption_Field_Value $fieldValue) {
                 return $fieldValue->getValue();
             }, $field->get_values());
 
-            $collection->set($field->get_name(), $values);
+            $collection[$field->get_name()] = $values;
         }
 
         return $collection;
@@ -2035,7 +2036,7 @@ class record_adapter implements RecordInterface, cache_cacheableInterface
     /** {@inheritdoc} */
     public function getExif()
     {
-        return new ArrayCollection($this->get_technical_infos());
+        return $this->get_technical_infos();
     }
 
     public function getStatusStructure()
diff --git a/templates/web/common/technical_datas.html.twig b/templates/web/common/technical_datas.html.twig
index 64b9de9412..b01978ac16 100644
--- a/templates/web/common/technical_datas.html.twig
+++ b/templates/web/common/technical_datas.html.twig
@@ -19,52 +19,52 @@
     <br/>
 
     {% block td_size %}
-        {% set width = record.exif.get(constant('media_subdef::TC_DATA_WIDTH')) %}
-        {% set height = record.exif.get(constant('media_subdef::TC_DATA_HEIGHT')) %}
+        {% set width = record.exif[constant('media_subdef::TC_DATA_WIDTH')]|default(null) %}
+        {% set height = record.exif[constant('media_subdef::TC_DATA_HEIGHT')]|default(null) %}
         {% if width is not none and height is not none %}
             {{ width ~ " x " ~ height }}
         {% endif %}
     {%  endblock %}
         <hr/>
     {% block td_camera_model %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_CAMERAMODEL')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_CAMERAMODEL')] is defined %}
           {{ 'Camera Model' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_CAMERAMODEL')) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_CAMERAMODEL')] }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_color_space %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_COLORSPACE')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_COLORSPACE')] is defined %}
           {{ 'Color space' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_COLORSPACE')) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_COLORSPACE')] }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_channels %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_CHANNELS')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_CHANNELS')] is defined %}
           {{ 'Channels' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_CHANNELS')) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_CHANNELS')] }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_color_depth %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_COLORDEPTH')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_COLORDEPTH')] is defined %}
           {{ 'Color Depth' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_COLORDEPTH')) }} bits
+          {{ record.exif[constant('media_subdef::TC_DATA_COLORDEPTH')] }} bits
           <br />
         {% endif %}
     {% endblock %}
     {% block td_iso_sensibility %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_ISO')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_ISO')] is defined %}
           {{ 'ISO sensibility' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_ISO')) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_ISO')] }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_flash %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_FLASHFIRED')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_FLASHFIRED')] is defined %}
           {{ 'Flash' | trans }} :
-          {% if record.exif.get(constant('media_subdef::TC_DATA_FLASHFIRED')) %}
+          {% if record.exif[constant('media_subdef::TC_DATA_FLASHFIRED')] %}
             {{ 'yes' | trans }}
           {% else %}
             {{ 'no' | trans }}
@@ -73,72 +73,72 @@
         {% endif %}
     {% endblock %}
     {% block td_shutter_speed %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_SHUTTERSPEED')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_SHUTTERSPEED')] is defined %}
             {{ 'Shutter speed' | trans }} :
-            {{ record.exif.get(constant('media_subdef::TC_DATA_SHUTTERSPEED')) }} s.
+            {{ record.exif[constant('media_subdef::TC_DATA_SHUTTERSPEED')] }} s.
             <br />
         {% endif %}
     {% endblock %}
     {% block td_apeture %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_APERTURE')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_APERTURE')] is defined %}
           {{ 'Aperture' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_APERTURE')) | round(2) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_APERTURE')] | round(2) }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_focal_length %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_FOCALLENGTH')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_FOCALLENGTH')] is defined %}
             {{ 'Focal length' | trans }} :
-            {{ record.exif.get(constant('media_subdef::TC_DATA_FOCALLENGTH')) }} mm
+            {{ record.exif[constant('media_subdef::TC_DATA_FOCALLENGTH')] }} mm
             <br />
         {% endif %}
     {% endblock %}
     {% block td_hyperfocal_distance %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_HYPERFOCALDISTANCE')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_HYPERFOCALDISTANCE')] is defined %}
           {{ 'Hyperfocal distance' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_HYPERFOCALDISTANCE')) | round(2) }} mm
+          {{ record.exif[constant('media_subdef::TC_DATA_HYPERFOCALDISTANCE')] | round(2) }} mm
           <br />
         {% endif %}
     {% endblock %}
     {% block td_light_value %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_LIGHTVALUE')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_LIGHTVALUE')] is defined %}
           {{ 'Light Value' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_LIGHTVALUE')) | round(2) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_LIGHTVALUE')] | round(2) }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_duration %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_DURATION')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_DURATION')] is defined %}
           {{ 'Duree' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_DURATION')) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_DURATION')] }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_framerate %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_FRAMERATE')) is not none %}
+        {% if record.exif[constant('media_subdef::TC_DATA_FRAMERATE')] is defined %}
           {{ 'Images par secondes' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_FRAMERATE')) | round(2) }} ips
+          {{ record.exif[constant('media_subdef::TC_DATA_FRAMERATE')] | round(2) }} ips
           <br />
         {% endif %}
     {% endblock %}
     {% block td_codec_audio %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_AUDIOCODEC'))  %}
+        {% if record.exif[constant('media_subdef::TC_DATA_AUDIOCODEC')] is defined %}
           {{ 'Codec Audio' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_AUDIOCODEC')) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_AUDIOCODEC')] }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_codec_video %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_VIDEOCODEC'))  %}
+        {% if record.exif[constant('media_subdef::TC_DATA_VIDEOCODEC')] is defined %}
           {{ 'Codec Video' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_VIDEOCODEC')) }}
+          {{ record.exif[constant('media_subdef::TC_DATA_VIDEOCODEC')] }}
           <br />
         {% endif %}
     {% endblock %}
     {% block td_audio_rate %}
-        {% if record.exif.get(constant('media_subdef::TC_DATA_AUDIOSAMPLERATE'))  %}
+        {% if record.exif[constant('media_subdef::TC_DATA_AUDIOSAMPLERATE')] is defined %}
           {{ 'Frequence d\'echantillonage' | trans }} :
-          {{ record.exif.get(constant('media_subdef::TC_DATA_AUDIOSAMPLERATE')) | round(2) }} kHz
+          {{ record.exif[constant('media_subdef::TC_DATA_AUDIOSAMPLERATE')] | round(2) }} kHz
           <br />
         {% endif %}
     {% endblock %}
diff --git a/templates/web/prod/preview/result_train.html.twig b/templates/web/prod/preview/result_train.html.twig
index afbb9ae8fa..f10584022a 100644
--- a/templates/web/prod/preview/result_train.html.twig
+++ b/templates/web/prod/preview/result_train.html.twig
@@ -5,7 +5,7 @@
         {% set thumb_w = 70 %}
         {% set thumb_h = 70 %}
 
-        {% set thumbnail = record.subdefs.get('thumbnail') %}
+        {% set thumbnail = record.subdefs.thumbnail|default(null) %}
 
         {% if thumbnail is not none %}
             {% set thumb_w = thumbnail.width %}
@@ -50,4 +50,3 @@
     </div>
   </div>
   <div id="PREVIEWTOOL"></div>
-            
\ No newline at end of file
diff --git a/templates/web/prod/results/macro.html.twig b/templates/web/prod/results/macro.html.twig
index 63fa7cc7a0..06b8d619cf 100644
--- a/templates/web/prod/results/macro.html.twig
+++ b/templates/web/prod/results/macro.html.twig
@@ -4,7 +4,7 @@
     {% set thumb_w = 256 %}
     {% set thumb_h = 256 %}
 
-    {% set thumbnail = record.subdefs.get('thumbnail') %}
+    {% set thumbnail = record.subdefs.thumbnail|default(null) %}
     {% if thumbnail is not none %}
         {% set thumb_w = thumbnail.width %}
         {% set thumb_h = thumbnail.height %}
@@ -39,7 +39,7 @@
     {% set thumb_w = 256 %}
     {% set thumb_h = 256 %}
 
-    {% set thumbnail = record.subdefs.get('thumbnailgif') %}
+    {% set thumbnail = record.subdefs.thumbnailgif|default(null) %}
     {% if thumbnail is not none %}
         {% set thumb_w = thumbnail.width %}
         {% set thumb_h = thumbnail.height %}
@@ -66,4 +66,4 @@
         <input type="hidden" name="width" value="{{original_w}}"/>
         <input type="hidden" name="height" value="{{original_h}}"/>
     </div>
-{% endmacro %}
\ No newline at end of file
+{% endmacro %}
diff --git a/templates/web/prod/results/record.html.twig b/templates/web/prod/results/record.html.twig
index 5ec7b3df3f..e3a990a76c 100644
--- a/templates/web/prod/results/record.html.twig
+++ b/templates/web/prod/results/record.html.twig
@@ -34,7 +34,7 @@
                     {% endif %}
                 </span>
             </div>
-            {% set rollover = record.subdefs.containsKey('thumbnailgif') %}
+            {% set rollover = record.subdefs.thumbnailgif is defined %}
             {% set extraclass = '' %}
             <div class="{% if rollover %}rollovable{% endif %}">
                 {% if rollover %}
@@ -116,7 +116,7 @@
                             </tbody>
                         </table>
 
-                        {% if record.subdefs.containsKey('preview') and has_access_subdef(record, 'preview') %}
+                        {% if record.subdefs.preview is defined and has_access_subdef(record, 'preview') %}
                             <div tooltipsrc="{{ path('prod_tooltip_preview', { 'sbas_id' : record.databoxId, 'record_id' : record.recordId }) }}" class="previewTips"></div>
                         {% endif %}