I discovered ClickHouse around 2017-18 and built a PoC to replace Elasticsearch: 5x better storage and qps, in a couple of weeks. Managers rejected it because it wasn't well known and was seen as "some database made by Russians." On a personal level, it's quite sad to have seen that train coming so early and not been able to get on board.
Were you using it for simple grep search or actually required advanced searching for eg: BM25. Clickhouse will only help you with grep like search from what I understand.
afaik CH introduced FTS rececently.