That hasn't been our experience. Our elasticsearch cluster has been a pain in the ass since day one with the main fix always "just double the size of the server" to the point where our ES cluster ended up costing more than our entire AWS bill pre-ES. (but that might be our limited experience) whereas something like postgres has required nearly 0 maintenance apart from adding the occasional index but even that has been just due to tuning, not that the DB fell over.
Both are AWS hosted products (RDS, AWS Elasticsearch).
Both are AWS hosted products (RDS, AWS Elasticsearch).