✨(backend) add document search indexer

Add indexer that loops across documents in the database, formats them
as json objects and indexes them in the remote "Find" mico-service.

src/backend/core/tests/test_utils.py

@@ -75,3 +75,28 @@ def test_utils_extract_attachments():
     base64_string = base64.b64encode(update).decode("utf-8")
     # image_key2 is missing the "/media/" part and shouldn't get extracted
     assert utils.extract_attachments(base64_string) == [image_key1, image_key3]
+
+
+def test_utils_get_ancestor_to_descendants_map_single_path():
+    """Test ancestor mapping of a single path."""
+    paths = ['000100020005']
+    result = utils.get_ancestor_to_descendants_map(paths, steplen=4)
+
+    assert result == {
+        '0001': {'000100020005'},
+        '00010002': {'000100020005'},
+        '000100020005': {'000100020005'},
+    }
+
+
+def test_utils_get_ancestor_to_descendants_map_multiple_paths():
+    """Test ancestor mapping of multiple paths with shared prefixes."""
+    paths = ['000100020005', '00010003']
+    result = utils.get_ancestor_to_descendants_map(paths, steplen=4)
+
+    assert result == {
+        '0001': {'000100020005', '00010003'},
+        '00010002': {'000100020005'},
+        '000100020005': {'000100020005'},
+        '00010003': {'00010003'},
+    }