Fix tests

Author: flobernd

Diff for: tests/Tests.Core/Tests.Core.csproj

@@ -6,10 +6,6 @@
     <IsTestProject>False</IsTestProject>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(TestPackageVersion)'!=''">
-    <PackageReference Include="Elastic.Clients.Elasticsearch.JsonNetSerializer" Version="$(TestPackageVersion)" />
-  </ItemGroup>
-
   <ItemGroup>
     <ProjectReference Include="$(SolutionRoot)\tests\Tests.Domain\Tests.Domain.csproj" />  
   </ItemGroup>