Positional variable binding not working in java

[ClementLagorce]

Hello,

I wanted to use this feature to be able to store filtered element indexes like this doc example :
library.books#$i['Kernighan' in authors].{
'title': title,
'index': $i
}
It works well on the exerciser page which is based on the javascript version of this library but not with java where I get a Parsing exception :
com.api.jsonata4java.expressions.ParseException: line 1:13 at null: token recognition error at: '#'
, line 1:14 at [@3,14:15='$i',<47>,1:14]: mismatched input '$i' expecting {, '.', 'in', '?', '[', '{', '~>', '*', '/', '+', '-', '%', '=', '!=', '<', '<=', '>', '>=', '&', '^', 'and', 'or'}
Is it a bug or this feature is simply not supported by the java version ? If not is it planned ?

Thanks in advance.

[wnm3]

This is new to me (added to jsonata.org in version 1.7) and not currently supported. There are no immediate plans to support it.

[ClementLagorce]

All right thanks for the answer !