winston-elasticsearch creates callback error when logging - node.js

Question

When using 'winston-elasticsearch' I am getting this error when logging a message:
TypeError: callback is not a function
My code:
const winston = require("winston");
const logger = new winston.Logger();
...
if( process.env.ELASTIC_SEARCH_LOGGING_URL ){
var elasticsearch = require('elasticsearch');
var client = new elasticsearch.Client({
host: process.env.ELASTIC_SEARCH_LOGGING_URL,
log: 'info'
});
logger.add(
require('winston-elasticsearch'),
{
client
}
);
}
//this causes the error
logger.info("hi")
I am seeing this:
clock_1 | TypeError: callback is not a function
clock_1 | at Elasticsearch.log (/usr/app/node_modules/winston-elasticsearch/index.js:105:5)
clock_1 | at transportLog (/usr/app/node_modules/winston/lib/winston/logger.js:234:15)
clock_1 | at /usr/app/node_modules/winston/node_modules/async/lib/async.js:157:13
I use node#8.9,winston#2.4.1 and winston-elasticsearch#0.7.0. The ELASTIC_SEARCH_LOGGING_URL env variable is accurate.
The error occurs here in the library:
log(info, callback) {
const level = info[LEVEL];
const { message } = info;
let meta = info[SPLAT];
if (meta !== undefined) {
// eslint-disable-next-line prefer-destructuring
meta = meta[0];
}
setImmediate(() => {
this.emit('logged', level);
});
const logData = {
message,
level,
meta,
// timestamp: this.opts.timestamp()
};
const entry = this.opts.transformer(logData);
this.bulkWriter.append(
this.getIndexName(this.opts),
this.opts.messageType,
entry
);
callback();
}
It's invoking 'callback()' which is not defined.
Am I misconfiguring?
Are there better ways to send application logs to ES via Winston?

Answer 1

Needs winston version 3.0 or higher.
const winston = require("winston"); //"winston": "~3",
const logger = winston.createLogger();
if( process.env.ELASTIC_SEARCH_LOGGING_URL ){
var elasticsearch = require('elasticsearch');
var winston_elasticsearch = require('winston-elasticsearch');
var client = new elasticsearch.Client({
host: process.env.ELASTIC_SEARCH_LOGGING_URL,
log: 'info'
});
logger.add( new winston_elasticsearch({
client,
index:"logging"
}));
}
Solution from the winston-elasticsearch developers:
https://github.com/vanthome/winston-elasticsearch/issues/69#issuecomment-430124467