Import Data from SQL Server 2014 to Elasticsearch - Driver not loaded


I want to import data from SQL Server table to elasticsearch using logstash.
But when I launch Logstash with my config file, the next message appears :

My config file lauched with logstash is :

I have specified the full path of my driver : "C:\DRIVERS\SqlServer\sqljdbc42.jar"

I don't understand where is my problem.
Someone can help me please ?

Elasticsearch version : 6.5.4

Thank in advance.

Does changing the backslashes in jdbc_driver_library to forward slashes help?

Thank you Badger for you suggestion but I have the same error.
I was tried this solution before opening this topic. Someone have another solution please ?

Many thank's

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