Develop

[vktor18]

this is a new pull request, I've added the mutex #11 and fix the support for Logstash 5.x

Thanks

[karmi]

Hi @vktor18, 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?