Cannot read property 'resurrectTimeout' of undefined

Greetings!

I found an error in the code:

https://github.com/elastic/elasticsearch-js/blob/1b638d69925d64a7402617265e739dc85b316ca1/lib/pool/ConnectionPool.js#L107

    const connection = this.connections.find(c => c.id === this.dead[0])

    if ((opts.now || Date.now()) < connection.resurrectTimeout) {
      debug('Nothing to resurrect')
      callback(null, null)
      return
    }

If the connection is not found. Then the code will throw an error further: Cannot read property ‘resurrectTimeout’ of undefined

I just got a lot of such errors in production.

[delvedor]

I’ve released this fix in v7.7.0-rc.1, you can install it with

 npm install @elastic/elasticsearch@next

[kulakowka]

Thank you very much for your help!

I add CustomConnectionPool to my application. And I collect logs. I’ll be back as soon as this happens again.

It should not, that error just means that all the connections registered in the client are marked as dead.

Yes. Restarting the application helps. Errors stop for a while.