fix: Specified "HNSW" for backwards compatibility prefering cluster environments over standalone.

backend/open_webui/config.py

@@ -1753,7 +1753,7 @@ MILVUS_URI = os.environ.get("MILVUS_URI", f"{DATA_DIR}/vector_db/milvus.db")
 MILVUS_DB = os.environ.get("MILVUS_DB", "default")
 MILVUS_TOKEN = os.environ.get("MILVUS_TOKEN", None)
 
-MILVUS_INDEX_TYPE = os.environ.get("MILVUS_INDEX_TYPE", "AUTOINDEX")
+MILVUS_INDEX_TYPE = os.environ.get("MILVUS_INDEX_TYPE", "HNSW")
 MILVUS_METRIC_TYPE = os.environ.get("MILVUS_METRIC_TYPE", "COSINE")
 MILVUS_HNSW_M = int(os.environ.get("MILVUS_HNSW_M", "16"))
 MILVUS_HNSW_EFCONSTRUCTION = int(os.environ.get("MILVUS_HNSW_EFCONSTRUCTION", "100"))