diff --git a/awswrangler/opensearch/_write.py b/awswrangler/opensearch/_write.py
index 07e2dc3b4..25dfe738c 100644
--- a/awswrangler/opensearch/_write.py
+++ b/awswrangler/opensearch/_write.py
@@ -61,6 +61,7 @@ def _actions_generator(
     doc_type: str | None,
     keys_to_write: list[str] | None,
     id_keys: list[str] | None,
+    routing_keys: list[str] | None = None,
     bulk_size: int = 10000,
 ) -> Generator[list[dict[str, Any]], None, None]:
     bulk_chunk_documents = []
@@ -77,6 +78,11 @@ def _actions_generator(
                 "_source": _selected_keys(document, keys_to_write),
             }
         )
+
+        if routing_keys:
+            _routing = "-".join([str(document[routing_key]) for routing_key in routing_keys])
+            bulk_chunk_documents[-1]["_routing"] = _routing
+
         if (i + 1) % bulk_size == 0:
             yield bulk_chunk_documents
             bulk_chunk_documents = []
@@ -496,6 +502,7 @@ def index_documents(
     doc_type: str | None = None,
     keys_to_write: list[str] | None = None,
     id_keys: list[str] | None = None,
+    routing_keys: list[str] | None = None,
     ignore_status: list[Any] | tuple[Any] | None = None,
     bulk_size: int = 1000,
     chunk_size: int | None = 500,
@@ -540,6 +547,8 @@ def index_documents(
     id_keys
         list of keys that compound document unique id. If not provided will use `_id` key if exists,
         otherwise will generate unique identifier for each document.
+    routing_keys
+        list of keys that compound document routing key. Optional.
     ignore_status
         list of HTTP status codes that you want to ignore (not raising an exception)
     bulk_size
@@ -599,7 +608,7 @@ def index_documents(
     _logger.debug("indexing %s documents into %s", total_documents, index)
 
     actions = _actions_generator(
-        documents, index, doc_type, keys_to_write=keys_to_write, id_keys=id_keys, bulk_size=bulk_size
+        documents, index, doc_type, keys_to_write=keys_to_write, id_keys=id_keys, routing_keys=routing_keys, bulk_size=bulk_size
     )
 
     success = 0