assert(operations.length)
  await esc.bulk({ operations })

{
  "level": 50,
  "time": 1678970629733,
  "name": "logforwarder",
  "err": {
    "type": "ResponseError",
    "message": "parse_exception\n\tRoot causes:\n\t\tparse_exception: request body is required",
    "stack": "ResponseError: parse_exception\n\tRoot causes:\n\t\tparse_exception: request body is required\n    at SniffingTransport.request (/usr/src/app/node_modules/@elastic/transport/lib/Transport.js:479:27)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async Client.BulkApi [as bulk] (/usr/src/app/node_modules/@elastic/elasticsearch/lib/api/api/bulk.js:51:12)\n    at async file:///usr/src/app/src/index.js:181:41",
    "name": "ResponseError",
    "meta": {
      "body": {
        "error": {
          "root_cause": [
            {
              "type": "parse_exception",
              "reason": "request body is required"
            }
          ],
          "type": "parse_exception",
          "reason": "request body is required"
        },
        "status": 400
      },
      "statusCode": 400,
      "headers": {
        "x-elastic-product": "Elasticsearch",
        "content-type": "application/json;charset=utf-8",
        "content-length": "163"
      },
      "meta": {
        "context": null,
        "request": {
          "params": {
            "method": "POST",
            "path": "/_bulk",
            "body": "",
            "querystring": "",
            "headers": {
              "user-agent": "elastic-transport-js/8.3.1 (linux 5.15.83-0-lts-x64; Node.js v18.13.0)",
              "x-elastic-client-meta": "es=8.6.0,js=18.13.0,t=8.3.1,hc=18.13.0",
              "accept": "application/vnd.elasticsearch+json; compatible-with=8,text/plain"
            }
          },
          "options": {},
          "id": 54354
        },
        "name": "elasticsearch-js",
        "connection": {
          "url": "http://elasticsearch-log:9201/",
          "id": "http://elasticsearch-log:9201/",
          "headers": {},
          "status": "alive"
        },
        "attempts": 0,
        "aborted": false
      },
      "warnings": null
    }
  },
  "msg": "Indexing error"
}