Send data via Splunk REST API to a Heavy Forwarder requires index on the HF?

We have indexer cluster setup. We are trying to use the REST API on the Heavy Forwarder to receive data update. But i am not sure if creating index on the HF is required to make sure indexer gets the data. I do see an earlier posting is similar to this one. Since it's an old posting, i just want to confirm If using REST API on the HF, while output.conf can point to the indexer/cluster would work, with no index stored on the HF. https://answers.splunk.com/answers/38176/data-indexed-via-rest-api-then-forwarded-on-to-another-indexer.html?utm_source=typeahead&utm_medium=newquestion&utm_campaign=no_votes_sort_relev#comment-746203