Add a new field from two field one is long type other is string type


I am trying to join two field fetched from database, one is long type and other is string type .

I am using following filter.

filter {
mutate {
add_field => { "IssueLink" => "%{project_key}-%{issue_num}" }



Expected output - "DOCS-667"

why the output is not expected ? What's the problem here ?

It's not clear what is the input and what is the actual output.
Can you please clear up your post?

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