Thank you for your interest!
It is true that the tool supports mainly relational database systems.
I don't quite understand what ElasticSearch support could mean? Is ElasticSearch a DBMS at all, or just a search engine?
I'm sorry if this question is stupid, but I've really never had anything to do with ElasticSearch.
I would be interested to know what impedance error you are referring to, and what problems you have had to deal with.
Also it would be interesting to know when that was. There have been a lot of improvements especially in the last year.
I am always trying to improve the tool. Feedback is very valuable for this.