Thanks @Azeemering , so according to this doc, the general splunk enterprise dedicated for only HEC will be able to handle the requests. The only thing is we need to change the IO threads and pilpelines for better performance. Do you agree?
Splunk HEC comes with your Splunk enterprise package. There's no additional hardware and software requirements for it. Go to settings -> Data inputs -> HTTP Event Collector -> Click on add new and Just follow the documentation mentioned below, and you're all set.