diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php
index c8a2318d74..917fb2ff10 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php
@@ -326,28 +326,19 @@ class ElasticSearchEngine implements SearchEngineInterface
      */
     private function getAllowedPrivateFields(SearchEngineOptions $options)
     {
-        $fields = array_keys($this->structure->getPrivateFields());
-
-        $allowed = array_fill_keys($fields, []);
-        foreach ($options->getDataboxes() as $databox) {
-            $databoxFields = $databox->get_meta_structure();
-            foreach ($fields as $field) {
-                if ($databoxFields->get_element_by_name($field)) {
-                    $allowed[$field] += $databox->get_collection_unique_ids();
-                }
-            }
+        // Get structure data and cross it with user rights (from options object)
+        $allowed_collections = [];
+        foreach ($options->getBusinessFieldsOn() as $collection) {
+            $allowed_collections[] = $collection->get_base_id();
         }
 
-        $businessCollections = array_map(function (\collection $collection) {
-            return $collection->get_base_id();
-        }, $options->getBusinessFieldsOn());
-
+        $map = $this->structure->getCollectionsUsedByPrivateFields();
         // Remove collections base_id which access is restricted.
-        foreach ($allowed as $name => &$collections) {
-            $collections = array_diff($collections, $businessCollections);
+        foreach ($map as $_ => &$collections) {
+            $collections = array_intersect($collections, $allowed_collections);
         }
 
-        return $allowed;
+        return $map;
     }
 
     /**
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php
index cb11a42307..3d0ddb47b5 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php
@@ -98,9 +98,9 @@ class Field
         return $this->type;
     }
 
-    public function getCollections()
+    public function getDependantCollections()
     {
-        return $this->collections;
+        return $this->used_by_collections;
     }
 
     public function isSearchable()
@@ -169,10 +169,15 @@ class Field
             );
         }
 
-        $used_by_collections = array_unique(array_merge(
-            $this->used_by_collections,
-            $other->used_by_collections
-        ), SORT_REGULAR);
+        $used_by_collections = array_values(
+            array_unique(
+                array_merge(
+                    $this->used_by_collections,
+                    $other->used_by_collections
+                ),
+                SORT_REGULAR
+            )
+        );
 
         return new self($this->name, $this->type, [
             'searchable' => $this->is_searchable,
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php
index fd997bdd16..a7e1c0ced7 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Structure.php
@@ -103,4 +103,22 @@ class Structure
 
         throw new DomainException(sprintf('Unknown field "%s".', $name));
     }
+
+    /**
+     * Returns an array of collections indexed by field name.
+     *
+     * [
+     *     "FieldName" => [1, 4, 5],
+     *     "OtherFieldName" => [4],
+     * ]
+     */
+    public function getCollectionsUsedByPrivateFields()
+    {
+        $map = [];
+        foreach ($this->private as $name => $field) {
+            $map[$name] = $field->getDependantCollections();
+        }
+
+        return $map;
+    }
 }
diff --git a/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/FieldTest.php b/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/FieldTest.php
index 3a5e49dd77..32c758194f 100644
--- a/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/FieldTest.php
+++ b/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/FieldTest.php
@@ -26,7 +26,7 @@ class FieldTest extends \PHPUnit_Framework_TestCase
         $this->assertFalse($merged->isPrivate());
         $this->assertFalse($merged->isFacet());
         $this->assertNull($merged->getThesaurusRoots());
-        $this->assertEquals(['1', '2', '3', '4'], $merged->getCollections());
+        $this->assertEquals(['1', '2', '3', '4'], $merged->getDependantCollections());
     }
 
     /**
@@ -106,4 +106,16 @@ class FieldTest extends \PHPUnit_Framework_TestCase
         $merged = $field->mergeWith($other);
         $this->assertEquals([$foo, $bar], $merged->getThesaurusRoots());
     }
+
+    public function testMergeWithDependantCollections()
+    {
+        $field = new Field('foo', Mapping::TYPE_STRING, [
+            'used_by_collections' => [1, 2]
+        ]);
+        $other = new Field('foo', Mapping::TYPE_STRING, [
+            'used_by_collections' => [2, 3]
+        ]);
+        $merged = $field->mergeWith($other);
+        $this->assertEquals([1, 2, 3], $merged->getDependantCollections());
+    }
 }
diff --git a/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/StructureTest.php b/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/StructureTest.php
index 93bd0fb042..1aab40e031 100644
--- a/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/StructureTest.php
+++ b/tests/Alchemy/Tests/Phrasea/SearchEngine/Structure/StructureTest.php
@@ -34,7 +34,7 @@ class StructureTest extends \PHPUnit_Framework_TestCase
         $field->isPrivate()->willReturn(false);
         $field->isFacet()->willReturn(false);
         $field->hasConceptInference()->willReturn(false);
-        $field->getCollections()->willReturn(['1']);
+        $field->getDependantCollections()->willReturn(['1']);
 
         $structure->add($field->reveal());
         $this->assertCount(1, $structure->getAllFields());
@@ -173,4 +173,28 @@ class StructureTest extends \PHPUnit_Framework_TestCase
         $structure = new Structure();
         $structure->isPrivate('foo');
     }
+
+    public function testCollectionsUsedByPrivateFields()
+    {
+        $structure = new Structure();
+        $structure->add($foo = (new Field('foo', Mapping::TYPE_STRING, [
+            'private' => true,
+            'used_by_collections' => [1, 2]
+        ])));
+        $structure->add(new Field('foo', Mapping::TYPE_STRING, [
+            'private' => true,
+            'used_by_collections' => [2, 3]
+        ]));
+        $structure->add(new Field('bar', Mapping::TYPE_STRING, [
+            'private' => true,
+            'used_by_collections' => [2, 3]
+        ]));
+        $structure->add(new Field('baz', Mapping::TYPE_STRING, ['private' => false]));
+        $this->assertEquals([1, 2], $foo->getDependantCollections());
+        static $expected = [
+            'foo' => [1, 2, 3],
+            'bar' => [2, 3]
+        ];
+        $this->assertEquals($expected, $structure->getCollectionsUsedByPrivateFields());
+    }
 }