Sometimes, especially when dealing with with libraries that have many records, it can be really helpful to be able to do an exact search. Examples would be serials like "Nature" or "Pädagogik". If you are a big or special library with a lot of materials on this topic limiting to serials might not be enough to find these quickly. With Zebra we can do: ti,ext:Nature to do an exact search on the field content. Nothing before, nothing after, not truncated etc. With Elasticsearch this doesn't seem to be possible right now.