@Julez Nyzl
JSON Jolt is mainly used to modify the structure of the JSON document. The NiFi JSON processor also supports expression language.
For you specific case, I would recommend using a combination of both Json Path processor and Jolt processor
Step 1 : extract the "value" part from the document e.g "test" into a flow file variable using the json path processor
Step 2 : use jolt processor to transform the key "id" into "number" and for the vaule part use the nifi expression language to manipulate the flow file variable as you would need it. Jolt spec to transform "id" into "number" [
{
"operation": "shift",
"spec": {
"id": "number"
}
}
]
here is a link for How to use NiFi EL in jolt processor by @Yolanda M. Davis - https://community.hortonworks.com/articles/105965/expression-language-with-jolt-in-apache-nifi.html
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