fix: exists() depends on exact FT.INFO error wording; an unrecognised "missing index" message makes create() never creat

redisvl/exceptions.py

@@ -87,6 +87,10 @@ def for_svs_vamana(cls, min_redis_version: str):
     "no such index",
     "search_index_not_found",
     "index not found",
+    # Valkey Search words the error as
+    # "Index with name '<name>' not found in database <n>", where the index
+    # name sits between "index" and "not found", so "index not found" misses it.
+    "not found in database",
 )
 
 

tests/unit/test_index_exists.py

@@ -34,6 +34,10 @@
     f"{INDEX_NAME}: no such index",
     f"SEARCH_INDEX_NOT_FOUND Index not found: {INDEX_NAME}",
     "Index not found",
+    # Valkey Search (e.g. Amazon ElastiCache for Valkey) puts the index name
+    # between "index" and "not found", so the "index not found" fragment above
+    # does not match it. Before #672 this wording worked via FT._LIST.
+    f"Index with name '{INDEX_NAME}' not found in database 0",
 ]
 
 # Failures that must never be read as "the index is absent": reporting False