Unable to properly tally all keys in nested json

I have this incoming json: { "name": "John Doe", "age": 42, "address": {
"street": "123 Main St", "city": "Anytown", "state": "CA", "zip": "12345"
}, "phoneNumbers": [ { "type": "home", "number": "555-1234" }, { "type":
"work", "number": "555-5678" } ] } I wish to tally all the keys in this
json in a map that gives me the key name as its key, and a count of the
number of times the key occurs in the json as its value. For this example,
the keys I expect in my output should include name, age, address,
address.street, address.city, address.state, address.zip, phoneNumbers,
phoneNumbers.type, and phoneNumbers.number. But I do not get that. Instead,
I get this for the list of fields: triage.json.fields
name,age,address,phoneNumbers And I get this for my tally count by key:
triage.json.tallyMap [name:1, age:1, address:1, phoneNumbers:1]

I am close, but not quite there. I don't capture all the keys. Here is my
code. How must I modify this to get the result I require? import
groovy.json.JsonSlurper import org.apache.commons.io.IOUtils import
java.nio.charset.StandardCharsets def keys = [] def tallyMap = [:] def
topValuesMap = [:] def ff = session.get() if (!ff) return try {
session.read(ff, { inputStream -> def json = new
JsonSlurper().parseText(IOUtils.toString(inputStream,
StandardCharsets.UTF_8)) json.each { k, v -> if (v != null &&
!v.toString().trim().isEmpty()) { tallyMap[k] = tallyMap.containsKey(k) ?
tallyMap[k] + 1 : 1 if (topValuesMap.containsKey(k)) { def valuesMap =
topValuesMap[k] valuesMap[v] = valuesMap.containsKey(v) ? valuesMap[v] + 1
: 1 topValuesMap[k] = valuesMap } else { topValuesMap[k] = [:].withDefault{
0 }.plus([v: 1]) } } } } as InputStreamCallback) keys =
tallyMap.keySet().toList() def tallyMapString = tallyMap.collectEntries {
k, v -> [(k): v] }.toString() def topValuesMapString =
topValuesMap.collectEntries { k, v -> [(k): v.sort{ -it.value }.take(10)]
}.toString() ff = session.putAttribute(ff, 'triage.json.fields',
keys.join(",")) ff = session.putAttribute(ff, 'triage.json.tallyMap',
tallyMapString) ff = session.putAttribute(ff, 'triage.json.topValuesMap',
topValuesMapString) session.transfer(ff, REL_SUCCESS) } catch (Exception e)
{ log.error('Error processing json fields', e) session.transfer(ff,
REL_FAILURE) }