[REVIEW] Add OpenSearch backend to cuvs-bench

python/cuvs_bench/cuvs_bench/backends/__init__.py

@@ -25,10 +25,12 @@
 )
 
 from .cpp_gbench import CppGoogleBenchmarkBackend
+from .opensearch import OpenSearchBackend
 
 # Auto-register built-in backends
 _registry = get_registry()
 _registry.register("cpp_gbench", CppGoogleBenchmarkBackend)
+_registry.register("opensearch", OpenSearchBackend)
 
 __all__ = [
     # Base classes and data structures
@@ -43,4 +45,5 @@
     "get_backend",
     # Built-in backends
     "CppGoogleBenchmarkBackend",
+    "OpenSearchBackend",
 ]