diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
index e090fc608b..b94ea3c8d3 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticsearchOptions.php
@@ -284,11 +284,20 @@ class ElasticsearchOptions
                 'label' => 'Aperture',
                 'field' => 'metadata_tags.Aperture',
                 'query' => 'meta.Aperture=%s',
+                'output_formatter' => function($value) {
+                    return round($value, 1);
+                },
             ],
             'shutterspeed_aggregate' => [
                 'label' => 'Shutter speed',
                 'field' => 'metadata_tags.ShutterSpeed',
                 'query' => 'meta.ShutterSpeed=%s',
+                'output_formatter' => function($value) {
+                    if($value < 1.0 && $value != 0) {
+                        $value = '1/' . round(1.0 / $value);
+                    }
+                    return $value . ' s.';
+                },
             ],
             'flashfired_aggregate' => [
                 'label' => 'FlashFired',
@@ -297,6 +306,10 @@ class ElasticsearchOptions
                 'choices' => [
                     "aggregated (2 values: fired = 0 or 1)" => -1,
                 ],
+                'output_formatter' => function($value) {
+                    static $map = ['0'=>"No flash", '1'=>"Flash"];
+                    return array_key_exists($value, $map) ? $map[$value] : $value;
+                },
             ],
             'framerate_aggregate' => [
                 'label' => 'FrameRate',
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/FacetsResponse.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/FacetsResponse.php
index 0d4cd60e93..a70e5c724a 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/FacetsResponse.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/FacetsResponse.php
@@ -7,6 +7,7 @@ use Alchemy\Phrasea\SearchEngine\Elastic\ElasticsearchOptions;
 use Alchemy\Phrasea\SearchEngine\Elastic\Structure\Structure;
 use Alchemy\Phrasea\SearchEngine\SearchEngineSuggestion;
 use Doctrine\Common\Collections\ArrayCollection;
+use igorw;
 
 class FacetsResponse
 {
@@ -55,12 +56,21 @@ class FacetsResponse
     private function buildBucketsValues($name, $buckets)
     {
         $values = array();
+
+        // does this aggregate has an output_formatter ? if not use a equality formatter
+        /** @var callable $formatter */
+        $formatter = igorw\get_in(
+            ElasticsearchOptions::getAggregableTechnicalFields(), [$name, 'output_formatter'],
+            function($v){return $v;}
+        );
+
         foreach ($buckets as $bucket) {
             if (!isset($bucket['key']) || !isset($bucket['doc_count'])) {
                 $this->throwAggregationResponseError();
             }
+
             $values[] = array(
-                'value' => $bucket['key'],
+                'value' => $formatter($bucket['key']),
                 'count' => $bucket['doc_count'],
                 'query' => $this->buildQuery($name, $bucket['key']),
             );