SOLR-17422: Remove v2 /api/cluster (CLUSTERSTATUS)

[dsmiley]

It's a kitchen sink API that is redundant with finer grain endpoints.

https://issues.apache.org/jira/browse/SOLR-17422

I generated the ref guide to review what the modified page looked like. Not ideal but it was formatted the same before SOLR-15748 added the API that this PR removes.

[epugh]

Would adding some pointers to the specific api's be helpful in RefGuide and javadocs? I can imagine a lot of user requests saying "what are the specific end points that replace this"....

[gerlowskija]

Would adding some pointers to the specific api's be helpful in RefGuide and javadocs?

+1 on documenting the more granular APIs that can achieve this.

Are we sure there aren't any gaps btw - I can't think of anything offhand that returns "live node" data, for instance? Ditto for listing cluster properties. I'm all for removing the kitchen-sink endpoint, but only if there's another way for users to fetch everything it offers...

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