✨(backend) add document search view

New API view that calls the indexed documents search view
(resource server) of app "Find".

Signed-off-by: Fabre Florian <ffabre@hybird.org>

src/backend/core/api/serializers.py

@@ -1013,3 +1013,17 @@ class ThreadSerializer(serializers.ModelSerializer):
         if request:
             return thread.get_abilities(request.user)
         return {}
+
+
+class FindDocumentSerializer(serializers.Serializer):
+    """Serializer for Find search requests"""
+
+    q = serializers.CharField(required=True)
+
+    def validate_q(self, value):
+        """Ensure the text field is not empty."""
+
+        if len(value.strip()) == 0:
+            raise serializers.ValidationError("Text field cannot be empty.")
+
+        return value