How to add a new field to an alias?

Dear all,

I am new to Elasticsearch and I want to know how I can add a new field to
an alias... Let me explain what I am doing,

Actually what I am trying to do is explained here,

So according to the response that I got, I tried to use "script_fields"
while the query, but as a result I got just the filtered result, what I
want is to get _source + scripted field.

Second thing I tried was,

I had an alias which was pointin my index, so what I tried to do was to
have a new alias pointing the same index but scripted filter added this
time; so I tried to generate a new alias while adding a new scripted field
but I am still unavailable to do that. Do you have any idea how I can
continue ?

Thanks a lot

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