Logstash not generating any output: "Class path contains multiple SLF4J bindings." error

I am trying to configure Logstash to collect data from filebeat, where itgets some SharePoint ULS logs and then push them to Elasticsearch with applying some filters. The issue I have is when I run the logstash service it generates the following messages when I view the logs and it basically does not write anything to Elasticsearch:
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.headius.backport9.modules.Modules (file:/.../lib/jars/jruby-complete- to field java.io.Console.cs
WARNING: Please consider reporting this to the maintainers of com.headius.backport9.modules.Modules
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
SLF4J: Class path contains multiple SLF4J bindings.

Then it loops again and again the same message appears.
Could you please help me to better identify the issue?

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