changing host 127.0.0.1

Hi

I am trying to run the redis on aws elasticache redis.
with that, I need to update the host 127.0.0.1 to aws endpoint.

I updated the wp-config something like this
define( ‘WP_REDIS_HOST’, ‘mynewhost’ );

but it’s not getting updated. Is there any ways to update the host?

Please advice.
Thank you