diff --git a/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py b/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py
index 80ffdadd96..2f77776807 100644
--- a/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py
+++ b/api/core/rag/datasource/vdb/opensearch/opensearch_vector.py
@@ -161,7 +161,7 @@ class OpenSearchVector(BaseVector):
                         logger.exception("Error deleting document: %s", error)
 
     def delete(self):
-        self._client.indices.delete(index=self._collection_name.lower())
+        self._client.indices.delete(index=self._collection_name.lower(), ignore_unavailable=True)
 
     def text_exists(self, id: str) -> bool:
         try:
diff --git a/api/tests/integration_tests/vdb/opensearch/test_opensearch.py b/api/tests/integration_tests/vdb/opensearch/test_opensearch.py
index 192c995ce5..210dee4c36 100644
--- a/api/tests/integration_tests/vdb/opensearch/test_opensearch.py
+++ b/api/tests/integration_tests/vdb/opensearch/test_opensearch.py
@@ -182,6 +182,28 @@ class TestOpenSearchVector:
         assert len(ids) == 1
         assert ids[0] == "mock_id"
 
+    def test_delete_nonexistent_index(self):
+        """Test deleting a non-existent index."""
+        # Create a vector instance with a non-existent collection name
+        self.vector._client.indices.exists.return_value = False
+
+        # Should not raise an exception
+        self.vector.delete()
+
+        # Verify that exists was called but delete was not
+        self.vector._client.indices.exists.assert_called_once_with(index=self.collection_name.lower())
+        self.vector._client.indices.delete.assert_not_called()
+
+    def test_delete_existing_index(self):
+        """Test deleting an existing index."""
+        self.vector._client.indices.exists.return_value = True
+
+        self.vector.delete()
+
+        # Verify both exists and delete were called
+        self.vector._client.indices.exists.assert_called_once_with(index=self.collection_name.lower())
+        self.vector._client.indices.delete.assert_called_once_with(index=self.collection_name.lower())
+
 
 @pytest.mark.usefixtures("setup_mock_redis")
 class TestOpenSearchVectorWithRedis: