It's somewhat smaller, but I believe not 20 times smaller. Among the major features, probably only authentication and auto-sharding are missing. Both are already in progress. On the other hand, the main feature missing in Elasticsearch is proper SQL support, which many Manticore users really appreciate.
Complex boolean queries work great. Manticore also supports over 20 full-text operators — a lot more than Elasticsearch. That's one reason it's popular in areas like patent and legal search, where strong full-text matching is especially important.
