Revert default dense vector options (#3400)

* Revert default dense vector options

* lint fixes

Author: miguelgrinberg

elasticsearch/serializer.py

@@ -54,7 +54,7 @@
 
     __all__.append("PyArrowSerializer")
 except ImportError:
-    pa = None
+    pa = None  # type: ignore[assignment]
 
 
 class JsonSerializer(_JsonSerializer):

test_elasticsearch/test_async/test_server/test_vectorstore/test_vectorstore.py

@@ -1065,14 +1065,9 @@ async def test_metadata_mapping(
             "dims": 10,
             "index": True,
             "index_options": {
-                "bits": 4,
-                "cluster_size": 384,
-                "default_visit_percentage": 0.0,
-                "flat_index_threshold": -1,
-                "rescore_vector": {
-                    "oversample": 3.0,
-                },
-                "type": "bbq_disk",
+                "ef_construction": 100,
+                "m": 16,
+                "type": "int8_hnsw",
             },
             "similarity": "cosine",
         }

test_elasticsearch/test_server/test_vectorstore/test_vectorstore.py

@@ -1045,14 +1045,9 @@ def test_metadata_mapping(self, sync_client: Elasticsearch, index: str) -> None:
             "dims": 10,
             "index": True,
             "index_options": {
-                "bits": 4,
-                "cluster_size": 384,
-                "default_visit_percentage": 0.0,
-                "flat_index_threshold": -1,
-                "rescore_vector": {
-                    "oversample": 3.0,
-                },
-                "type": "bbq_disk",
+                "ef_construction": 100,
+                "m": 16,
+                "type": "int8_hnsw",
             },
             "similarity": "cosine",
         }