JOLT Keep structure after array shift - json

Question

I'm trying to construct a JOLT transformation such that it will change a parameter value if the paramter name matches in a given array.
Example Input:
{
"component": {
"parameters": [
{
"parameter": {
"name": "var_name",
"value": "val"
}
},
{
"parameter": {
"name": "1",
"value": "2"
}
}
]
},
"additional": "onemore"
}
Desired Output:
{
"component": {
"parameters": [
{
"parameter": {
"name": "var_name",
"value": "new_val"
}
},
{
"parameter": {
"name": "1",
"value": "2"
}
}
]
},
"additional": "onemore"
}
My Current JOLT transform:
[
{
"operation": "shift",
"spec": {
"component": {
"parameters": {
"*": {
"parameter": {
"name": {
"var_name": {
"#new_val": "&6.&5[&4].&3.value"
}
}
}
}
}
}
}
}
]
The problem with my JOLT transform is that it deletes the rest of the Json, whereas I'd like to mantain it unchanged if there's no match
I tried looking for a solution, but the closest I got was this one, which allowed me to make the current transform, but I don't understand how to fix it properly.
EDIT:
I actually missed part of the input when writing the example, but thanks to #Barbaros Özhan answer I was able to complete my transformation.
For future rference if anybody else needs it my original input had additonal fields like:
{
"component": {
"parameters": [
{
"option": "true",
"parameter": {
"name": "var_name",
"description": "desc",
"value": "val"
}
},
{
"option": "false",
"parameter": {
"name": "1",
"description": "desc",
"value": "2"
}
}
],
"other value": "baz"
},
"additional": "onemore"
}
And the final transformation I used was slightly tweaked to account for those like so:
[
{
"operation": "shift",
"spec": {
"component": {
"parameters": {
"*": {
"parameter": {
"name": {
"#": "&5.&4[&3].&2.&1",
"var_name": {
"#new_val": "&6.&5[&4].&3.value"
},
"*": {
"#(2,value)": "&6.&5[&4].&3.value"
}
},
"value": "&6.&5[&4].&3.value",
"*": "&4.&3[&2].&1.&"
},
"*": "&3.&2[&1].&"
}
},
"*": "&1.&"
},
"*": "&"
}
}
]

Answer 1

You can use this shift transformation spec
[
{
"operation": "shift",
"spec": {
"component": {
"parameters": {
"*": {
"parameter": {
"name": {
"#": "&5.&4[&3].&2.&1", // # matches the value taken from one level up, eg. replicating "name"
"var_name": {
"#new_val": "&6.&5[&4].&3.value"
},
"*": {
"#(2,value)": "&6.&5[&4].&3.value"
}
}
}
}
}
},
"*": "&" // the "else" case(the attributes other than "component")
}
}
]