NIFI Jolt Transformation set change key name based in its value

[#1]

Hi,

I am trying to change the key name based on the value it contains. I need help in transforming the output based in the following input JSON 

{
"id": "3240",

"files" : {
"FileName3": "mac-20200806.json",
"FileName2": "window-20200806.json",
"FileName1": "linux-20200806.json"

 }
}

Output

{
"id": "3240",

"files" : {
"macFile": "mac-20200806.json",
"windowFile": "window-20200806.json",
"linuxFile": "linux-20200806.json"

 }
}

There can be any number for files but the file name will always start with mac, windows or Linux

[#2]

Hi @ammarhassan ,
Please find the below jolt spec:

[
 {
  "operation": "shift",
  "spec": {
   "files": {
    "*": {
     "*-*": {
      "$0": "files.&(1,1)File"
     }
    }
   },
   "*": "&"
  }
 }
]

[#3]

Hello, is there such a thing as an escape character? I would need keynames with a "." in it. In this example something like:

Output

{
"id": "3240",

"files" : {
"mac.File": "mac-20200806.json",
"window.File": "window-20200806.json",
"linux.File": "linux-20200806.json"

 }
}

But dots are interpreted as nesting objects. Thanks

Edit: Nevermind, I found we can use escape characters with "\\"