Minor Description
While working on SOLR-13996, I had the need to mock the cluster state for various configurations and I used ClusterStateMockUtil.
However, I ran into a few issues that needed to be fixed:
1. The methods in this class are protected making it useful only within the same package
2. A null router was set for DocCollection objects
3. The DocCollection object is created before the slices so the DocCollection.getActiveSlices method returns empty list because the active slices map is created inside the DocCollection constructor
4. It did not set core name for the replicas it created
5. It has no support for replica types so it only creates nrt replicas
I will use this Jira to fix these problems and make the methods in that class public (but marked as experimental)