Hey, fellow Splunkers,
When I actually attempted to conduct multiple rename fields using that method, I receive the following error: rename [old_name AS/TO/-> new_name]+
While the above works, you are probably better expanding rename command instead of piping to rename for every field you want renamed.
eg. | rename fieldA AS newnameA, fieldB AS newnameB, fieldC AS newnameC
| rename fieldA AS newnameA |rename fieldB AS newnameB |rename fieldC AS newnameC