Me again... so, even though the warning is being displayed in the graylog log file, this is actually a elasticsearch issue. I believe I know how to fix it kind of. To get rid of this warning, I need to add a couple of lines to the elasticsearch.yml configuration file. The problem is, this file is not located in persistent storage (i.e. /appdata/), as it is located at: /usr/share/elasticsearch/config/elasticsearch.yml. Can anyone tell me how I can make persistent changes to this file? Specifically, I need to add these two lines:
xpack.security.enabled: true
discovery.type: single-node