FIX: Fleet plugin logs ERROR during kibana restart

[jertel]

[2023-08-04T13:51:40.846+00:00][ERROR][plugins.fleet] Failed to fetch latest version of endpoint from registry: Cannot read properties of null (reading 'version')
{"service":{"node":{"roles":["background_tasks","ui"]}},"ecs":{"version":"8.6.1"},"@timestamp":"2023-08-04T13:51:40.846+00:00","message":"Failed to fetch latest version of endpoint from registry: Cannot read properties of null (reading 'version')","log":{"level":"ERROR","logger":"plugins.fleet"},"process":{"pid":7},"trace":{"id":"f5d20a59456a7dd36e402992bba2f8a2"},"transaction":{"id":"fed118032728c30e"}}

[2023-08-04T13:51:47.880+00:00][ERROR][plugins.securitySolution] Unable to create detection rules automatically (undefined): Error installing new prebuilt rules
{"service":{"node":{"roles":["background_tasks","ui"]}},"ecs":{"version":"8.6.1"},"@timestamp":"2023-08-04T13:51:47.880+00:00","message":"Unable to create detection rules automatically (undefined): Error installing new prebuilt rules","log":{"level":"ERROR","logger":"plugins.securitySolution"},"process":{"pid":7},"trace":{"id":"f5d20a59456a7dd36e402992bba2f8a2"},"transaction":{"id":"fed118032728c30e"}}

[weslambert]

The first error can be safely ignored and is likely due to timing. The other error is still being reviewed.

[weslambert]

The second error is due to an issue with the registry only storing the last two versions of the endpoint package. In this case, the versions are 8.9.0 and 8.9.1. Since we are currently using Elastic 8.8.0, there are no eligible packages to get from the registry. As a result, a null response is provided to Kibana since it expects that the native registry will have all available packages. Since there are no eligible packages in the registry, Kibana defaults to the bundled version of the package.

[weslambert]

Security-Onion-Solutions/securityonion-image#454