Based on the provided new input and the expected output as I was able to understand where you always want to consider the last element of both DEFECT_ROOT_CAUSE & SPRINT_LIST which both may or may not be an array of values, I would take a different approach to the jolt spec which is much simpler as follows: [
// First spec is convert everything into list regardless
{
"operation": "cardinality",
"spec": {
"*": {
"SPRINT_LIST": "MANY",
"DEFECT_ROOT_CAUSE": "MANY"
}
}
}
,
// From the generated list above return last element
{
"operation": "modify-overwrite-beta",
"spec": {
"*": {
"SPRINT_LIST": "=lastElement",
"DEFECT_ROOT_CAUSE": "=lastElement"
}
}
}
]
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