Use latest stable mongo driver and add BigDecimal and Timestamp bug fixes

[sdmeisner]

BigDecimal.from_bson was calling an undefined method. This kept the Mongo driver monitoring threads from receiving server status updates in failover scenarios. Eventually Logstash was crashing with a NoServerAvailable error after a failover and failback to the original primary.

Thanks for contributing to Logstash! If you haven't already signed our CLA, here's a handy link: https://www.elastic.co/contributor-agreement/

[ghost]

Hi @sdmeisner, we have found your signature in our records, but it seems like you have signed with a different e-mail than the one used in yout Git commit. Can you please add both of these e-mails into your Github profile (they can be hidden), so we can match your e-mails to your Github profile?

[sdmeisner]

Hi @sdmeisner, we have found your signature in our records, but it seems like you have signed with a different e-mail than the one used in yout Git commit. Can you please add both of these e-mails into your Github profile (they can be hidden), so we can match your e-mails to your Github profile?

Sure, done

[colinsurprenant]

Hi @sdmeisner - Thanks for your contribution! Could you please rebase this PR once #57 is merged and we can move this forward? Probably also update the library version?

[YakobovLior]

Hey, is there an estimation when these changes will be merged?
From my understanding the update to use mongo gem version 2.6 will give the ability to connect to mongodb with SSL (fix me if I'm wrong - #50).
Thanks in advance,
Lior

[wjjpt]

Hi, it works with 2.7.2 too, which it is the current stable version and has support for TLS hostname verification.

[colinsurprenant]

This PR has been moved to #59, closing here.

[colinsurprenant]

version 3.1.6 has been published which includes the changes suggested here.

[YakobovLior]

Thank you ☺