diff --git a/lib/Alchemy/Phrasea/Controller/Admin/SearchEngineController.php b/lib/Alchemy/Phrasea/Controller/Admin/SearchEngineController.php
index 8073027302..565c2d759b 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/SearchEngineController.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/SearchEngineController.php
@@ -17,6 +17,7 @@ use Alchemy\Phrasea\SearchEngine\Elastic\Structure\GlobalStructure;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use databox_descriptionStructure;
 
 class SearchEngineController extends Controller
 {
@@ -77,6 +78,16 @@ class SearchEngineController extends Controller
      */
     private function saveElasticSearchOptions(ElasticsearchOptions $configuration)
     {
+        // save to databoxes fields for backward compatibility (useless ?)
+        foreach($configuration->getAggregableFields() as $fname=>$aggregableField) {
+            foreach ($this->app->getDataboxes() as $databox) {
+                if(!is_null($f = $databox->get_meta_structure()->get_element_by_name($fname, databox_descriptionStructure::STRICT_COMPARE))) {
+                    $f->set_aggregable($aggregableField['limit'])->save();
+                }
+            }
+        }
+
+        // save to conf
         $this->getConf()->set(['main', 'search-engine', 'options'], $configuration->toArray());
     }
 
diff --git a/lib/Alchemy/Phrasea/Core/Provider/SearchEngineServiceProvider.php b/lib/Alchemy/Phrasea/Core/Provider/SearchEngineServiceProvider.php
index 58f77475a1..faddfae370 100644
--- a/lib/Alchemy/Phrasea/Core/Provider/SearchEngineServiceProvider.php
+++ b/lib/Alchemy/Phrasea/Core/Provider/SearchEngineServiceProvider.php
@@ -228,7 +228,8 @@ class SearchEngineServiceProvider implements ServiceProviderInterface
         });
 
         $app['elasticsearch.options'] = $app->share(function ($app) {
-            $options = ElasticsearchOptions::fromArray($app['conf']->get(['main', 'search-engine', 'options'], []));
+            $conf = $app['conf']->get(['main', 'search-engine', 'options'], []);
+            $options = ElasticsearchOptions::fromArray($conf);
 
             if (empty($options->getIndexName())) {
                 $options->setIndexName(strtolower(sprintf('phraseanet_%s', str_replace(
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php
index 63d9ec108e..15482f31d4 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php
@@ -652,7 +652,7 @@ class ElasticSearchEngine implements SearchEngineInterface
         $aggs = [];
         // technical aggregates (enable + optional limit)
         foreach (ElasticsearchOptions::getAggregableTechnicalFields() as $k => $f) {
-            $size = $this->options->getAggregableFieldLimit($k);
+            $size = $this->options->getAggregableFieldLimit('_'.$k);
             if ($size !== databox_field::FACET_DISABLED) {
                 if ($size === databox_field::FACET_NO_LIMIT) {
                     $size = ESField::FACET_NO_LIMIT;
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
index d65221dc8f..14ed77d008 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
@@ -9,6 +9,7 @@
  */
 namespace Alchemy\Phrasea\SearchEngine\Elastic;
 
+use databox_field;
 use igorw;
 
 
@@ -219,10 +220,24 @@ class ElasticsearchOptions
         $this->highlight = $highlight;
     }
 
+    public function setAggregableFieldLimit($key, $value)
+    {
+        if(is_null($this->getAggregableField($key))) {
+            $this->_customValues['facets'][$key] = [];
+        }
+        $this->_customValues['facets'][$key]['limit'] = $value;
+    }
+
     public function setAggregableField($key, $attributes)
     {
-        $facets = $this->getAggregableFields();
-        $facets[$key] = $attributes;
+        $this->getAggregableFields();    // ensure facets exists
+        $this->_customValues['facets'][$key] = $attributes;
+    }
+
+    public function getAggregableFieldLimit($key)
+    {
+        $facet = $this->getAggregableField($key);
+        return (is_array($facet) && array_key_exists('limit', $facet)) ? $facet['limit'] : databox_field::FACET_DISABLED;
     }
 
     public function getAggregableField($key)
@@ -231,7 +246,10 @@ class ElasticsearchOptions
         return array_key_exists($key, $facets) ? $facets[$key] : null;
     }
 
-    public function &getAggregableFields()
+    /**
+     * @return array
+     */
+    public function getAggregableFields()
     {
         if(!array_key_exists('facets', $this->_customValues) || !is_array($this->_customValues['facets'])) {
             $this->_customValues['facets'] = [];