diff --git a/app/es_subset_generator/mappings.py b/app/es_subset_generator/mappings.py
index 68e6cdd7b941d261764d70075c4a68d7d1a0b14b..f2585f0c24a843161eed67ddcb3e7b3ea1341ca1 100644
--- a/app/es_subset_generator/mappings.py
+++ b/app/es_subset_generator/mappings.py
@@ -24,13 +24,18 @@ def parse_mapping_from_es_response(index_mapping, required_source):
     """
     Reads the response of the mapping from ES and produces the mapping to use for the subset index
     :param index_mapping: mapping dict obtained from es
+    :param required_source: source (list of properties) to get from the mapping
     :return: the mapping ready to be applied to the subset index
     """
+    mappings_to_apply = {
+        'properties': {}
+    }
 
-    for source_property in required_source:
-        print(f'locating: {source_property}')
+    for current_property in required_source:
+        mapping_to_apply = get_mapping_to_apply_in_subset_index(index_mapping, current_property)
+        mappings_to_apply['properties'][current_property] = mapping_to_apply
 
-    print(index_mapping)
+    return mappings_to_apply
 
 
 def get_mapping_to_apply_in_subset_index(index_mapping, property_path):
@@ -44,14 +49,11 @@ def get_mapping_to_apply_in_subset_index(index_mapping, property_path):
     is_nested = source_property_config.get('properties') is not None
 
     if not is_nested:
-
         mapping_to_apply = {
             'type': source_property_config['type']
         }
         return mapping_to_apply
 
-
-
     mapping_to_apply = {
         'properties': {}
     }
diff --git a/app/es_subset_generator/test/test_mappings_handling.py b/app/es_subset_generator/test/test_mappings_handling.py
index e4b2a0db8a9fc9e0d648466989485500920336ae..e51aa9620cef4366f5f0dc4c90e81199b9ea2c31 100644
--- a/app/es_subset_generator/test/test_mappings_handling.py
+++ b/app/es_subset_generator/test/test_mappings_handling.py
@@ -22,8 +22,18 @@ class TestMappingsHandling(unittest.TestCase):
         with open(sample_mapping_path, 'rt') as sample_mapping_file:
             mapping_from_base_index = json.load(sample_mapping_file)
             source = ['pref_name']
-            mappings.parse_mapping_from_es_response(mapping_from_base_index, source)
-            # FINISH THIS!
+            mappings_to_apply_got = mappings.parse_mapping_from_es_response(mapping_from_base_index, source)
+
+            mappings_to_apply_must_be = {
+                "properties": {
+                    'pref_name': {
+                        'type': 'keyword'
+                    },
+                }
+            }
+
+            self.assertEqual(mappings_to_apply_got, mappings_to_apply_must_be,
+                             msg='The mappings were not produced correctly!')
 
     def test_locates_source_config_of_property(self):
         """