From 9c49ea56a2ffcaa57f63e5c6cab9d2f4fd04a504 Mon Sep 17 00:00:00 2001
From: ElliottKasoar <45317199+ElliottKasoar@users.noreply.github.com>
Date: Tue, 11 Jun 2024 08:50:25 +0100
Subject: [PATCH] Add return type hint

---
 abcd/backends/atoms_opensearch.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/abcd/backends/atoms_opensearch.py b/abcd/backends/atoms_opensearch.py
index f623d06b..39844a43 100644
--- a/abcd/backends/atoms_opensearch.py
+++ b/abcd/backends/atoms_opensearch.py
@@ -174,13 +174,14 @@ def from_atoms(
         return obj
 
     @property
-    def _id(self):
+    def _id(self) -> Union[str, None]:
         """
-        Gets the OpenSearch document ID stored in data.
+        Get the OpenSearch document ID stored in data.
 
         Returns
         -------
-        Current document ID.
+        Union[str, None]
+            Current document ID.
         """
         return self.get("_id", None)