Why and how to resolve the problem of install/search of Nuget packages with Semver2 after upgrade to 6.0?

Before the support for Nuget API V3, Artifactory did not have any filters regarding Semver2.
In order to be close as we can to Nuget.org we changed the functionality.
This means that clients that are below 4.3 might not find packages when they do install or search commands in Visual Studio or CLI.

In order to restore the old functionality and return all results regardless if they semver compatible, add the following flag to artifactory.system.properties file: 
nuget.disableSemVer2SearchFilterForLocalRepos=true