How much Real Time is Elastic Search RealTime Search?

I have been working around Elastic Search from a last couple of weeks, and trying to build a real-time OLTP system around the Elastic Search, where in the documents indexed in a logical transaction should be visible to the next transaction as soon as the first one is indexed.

However, Elastic Search claims to be real-time, it looks to me, that the search is only near-real time and not real time, which will require a minimum refresh interval to be defined for the documents to be available to search.

If that is the case, how the search can be real-time ?

I there, anything which I missed, to achieve an absolutely real-time search ?