first of all thank you very much for your great support @jasontedor. As mentioned here: https://github.com/elastic/elasticsearch/issues/28538 I'm creating an explicit thread asking how to downgrade ES on a debian system where ES was initally installed and upgraded to 6.2 using apt-get.
Please tell me what other information you need in detail.
For Debian with apt-get you can specify the version:
$ sudo apt-get install elasticsearch=6.1.3
This will in-place install Elasticsearch 6.1.3 over your 6.2.0 installation. You can then upgrade again after you address the plugin issue that got you here in the first place.
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