Lets leave the index names / ILM etc as you have it working (there were perhaps other ways to do that but it looks good if it is doing what you want)
Regarding the Pipeline you would want read / write access to the Kibana Dev Tools if you have that we can probably make it work.
I suspect it is not getting executed for another reason...
I have my suspicions...
So open a new thread ... put the Pipeline in it and a sample message that you thought that should go through the pipeline...