Hi @reza_setareh,
Which version of the client where you using before? By not_analyzed are you referring to the old strong analyzed and not_analyzed behaviour as referenced in this old topic and blog post?
If so I think you're looking to make use of the keyword type that replaced not_analyzed. If you're using the automapping feature of the client it should infer the type to give text with a keyword subfield for String, or keyword for a couple of other types as per the documentation. Or alternatively you can map manually similar to the example in the documentation.
Do let me know if that is what you're not trying to do. Hope that helps!