Elastic 2.4 - Get substring of text field

I'm using Elastic 2.4 . One of the fields I need to get is very long text, and I'm trying to get only a short part of it. I've tried substring, but it doesn't work. I'm not sure I tried it correctly or if it is supported in 2.4 . Can someone help ?

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.