It sounds like they're really targeting the logging search store part of ELK, which can be a perfectly fine objective, but no need to mislead audiences since they will find out and then you've made an enemy
The Manticore Search github repository calls it a "drop-in replacement for E in the ELK stack," not just a replacement for Elasticsearch. On https://manticoresearch.com/, it's described as an "Elasticsearch alternative," so the confusion is probably just here on HN :)
It sounds like they're really targeting the logging search store part of ELK, which can be a perfectly fine objective, but no need to mislead audiences since they will find out and then you've made an enemy