Getting org.springframework.orm.hibernate5.HibernateOptimisticLockingFailureException exception when posting pages simultaneously

const httpClient = addon.httpClient(req).asUser("admin");
let n = 100;
for(let i =0 ; i<n; i++) {
    httpClient.post({
        headers: {
            "X-Atlassian-Token": "nocheck",
        },
        json:
            {
                body:
                    {
                        storage:
                            {
                                representation: "storage",
                                value:
                                    "<p>Something</p>"
                            }
                    },
                space: { key: "SPACE_KEY" },
                title: `Page ${i} of ${n}`,
                type: "page"
            },
        url: "/rest/api/content",
    }, function (error, response, body) {
        console.log('==========================================================');
        console.log(`Error: ${JSON.stringify(error, null, 2)}`);
        console.log(`Response: ${JSON.stringify(response, null, 2)}`);
        console.log(`Body: ${JSON.stringify(body, null, 2)}`);
        console.log('==========================================================');
    });
}

{
  "statusCode": 500,
  "body": {
    "statusCode": 500,
    "message": "org.springframework.orm.hibernate5.HibernateOptimisticLockingFailureException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1; nested exception is org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1"
  },
  "headers": {
    "server": "Atlassian Proxy/1.13.6.2",
    "cache-control": "no-cache, must-revalidate",
    "content-type": "application/json",
    "strict-transport-security": "max-age=315360000; includeSubDomains; preload",
    "date": "Mon, 03 Dec 2018 02:42:38 GMT",
    "atl-traceid": "4a5657e212892d86",
    "expires": "Thu, 01 Jan 1970 00:00:00 GMT",
    "x-xss-protection": "1; mode=block",
    "transfer-encoding": "chunked",
    "atl-tcs-time": "Cache Hit",
    "x-ausername": "annecalantog",
    "x-content-type-options": "nosniff",
    "connection": "close",
    "atl-confluence-via": "h:confluence-prod-us-8-3.prod.atl-paas.net"
  },
  "request": {
    "uri": {
      "protocol": "https:",
      "slashes": true,
      "auth": null,
      "host": "<instance-name>.atlassian.net",
      "port": 443,
      "hostname": "<instance-name>.atlassian.net",
      "hash": null,
      "search": null,
      "query": null,
      "pathname": "/wiki/rest/api/content",
      "path": "/wiki/rest/api/content",
      "href": "https://<instance-name>.atlassian.net/wiki/rest/api/content"
    },
    "method": "POST",
    "headers": {
      "X-Atlassian-Token": "nocheck",
      "authorization": "Bearer <bearer-token>",
      "User-Agent": "atlassian-connect-express/2.1.4",
      "accept": "application/json",
      "content-type": "application/json",
      "content-length": 145
    }
  }
}