How to get a GitHub repository's commits along with the files that were changed and the changes themselves using GraphQL

Question

I am able to get the list of commits (with fields like commit messages, oid, commit url etc) along with the number of changedFiles, made in a repository on the master branch.
However I am not able to figure out how to get any information about the changes themselves and the files that were changed.

In v3 of the REST API, the information about the changes were contained in files->patch, and files -> raw_url or blob_url gave info about the original file itself at that stage.

Q) In v4 of GitHub's API using GraphQL how do I get the corresponding information?

Query I am stuck with right now (showing only 1 commit for brevity)-

query {
  rateLimit{
    cost
    remaining
  }
  repository(owner: "elastic", name: "elasticsearch") {
    name
    defaultBranchRef {
      name
      target {
        ... on Commit {
          history(first:1){
            nodes{
              message
              changedFiles
              id
              oid
              treeUrl
              url
              tree{
                oid
              }
            }
            pageInfo{
              hasNextPage
              startCursor
              endCursor
            }
          }
        }
      }
    }
  }
}

Output:

{
  "data": {
    "rateLimit": {
      "cost": 1,
      "remaining": 4999
    },
    "repository": {
      "name": "elasticsearch",
      "defaultBranchRef": {
        "name": "master",
        "target": {
          "history": {
            "nodes": [
              {
                "message": "Small corrections to HLRC doc for _termvectors (#35221)\n\nRelates to #33447",
                "changedFiles": 2,
                "id": "MDY6Q29tbWl0NTA3Nzc1OmEyYzIyYWQ3YWViMGY4ZDUxNDg2NzdkZDcyMjJhZDQzYWZlZTlhMTc=",
                "oid": "a2c22ad7aeb0f8d5148677dd7222ad43afee9a17",
                "treeUrl": "https://github.com/elastic/elasticsearch/tree/a2c22ad7aeb0f8d5148677dd7222ad43afee9a17",
                "url": "https://github.com/elastic/elasticsearch/commit/a2c22ad7aeb0f8d5148677dd7222ad43afee9a17",
                "tree": {
                  "oid": "4f5f11e0e55aeafc4677800959232726a2cd787c"
                }
              }
            ],
            "pageInfo": {
              "hasNextPage": true,
              "startCursor": "a2c22ad7aeb0f8d5148677dd7222ad43afee9a17 0",
              "endCursor": "a2c22ad7aeb0f8d5148677dd7222ad43afee9a17 0"
            }
          }
        }
      }
    }
  }
}