I am wondering what is the usage of expression in the drop down of script field in lang option and how can i leverage that option .
The expressions what you see in the drop down is
Lucene expressions. http://lucene.apache.org/core/4_9_0/expressions/index.html?org/apache/lucene/expressions/js/package-summary.html
Currently Kibana only supports Lucene expressions in script fields, for security reasons.
Here are some additional documentation links : https://www.elastic.co/guide/en/kibana/current/scripted-fields.html
Thanks for the response I was looking into both expression and painless , the only thing which i noticed in either of them is i cannot is comparison operators in painless , rest i guess is same .
Also Can i use the script fields for extracting other fields . I tried this but got failed.
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