How to forward the event of a specific index on the heavy forwarder to the specified index of another indexer?

I have a separate Splunk Enterprise instance, The 9997 port has been enabled to receive events from each host and set up their own index for them。For example: apache_access, secure ect ..... now , I want to convert it into a heavy forwarder and forwards these events to an indexer cluster. So the question is coming， How do I forward the event of a specific index on the heavy forwarder, （for example: apache_access） to the specified index of the indexer cluster (for example: web_apache_access) Example: apache_access (from heavy-forwarder) ————————>Forward TO ————>web_apache_access（indexer clustering）