Elaasticsearch query to compare a filed value of 2 documents in same index

I have written below query to fetch latest two document to get few fields like #processor, allocated_memory for a particular server.
I want to extend the query to compare these fields i.e. #processor, allocated_memory for the 2 filtered documents and return the difference value.

"query": {
"term": {
"servername.keyword": {
"value": "prod01"
"size": 2,
"sort": [
"logtime": {
"order": "desc"

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