Print "Connecting to existing cluster" message to stderr instead of stdout (#10575)

python/ray/worker.py

@@ -622,13 +622,16 @@ def init(
 
     if address:
         redis_address, _, _ = services.validate_redis_address(address)
-        print("Connecting to existing Ray cluster at address:", redis_address)
     else:
         redis_address = None
 
     if configure_logging:
         setup_logger(logging_level, logging_format)
 
+    if redis_address is not None:
+        logger.info(
+            f"Connecting to existing Ray cluster at address: {redis_address}")
+
     if local_mode:
         driver_mode = LOCAL_MODE
     else: