Migrate org.apache.solr.cli tools from V1 to V2 APIs

[epugh]

Replaces legacy V1 admin API calls (CollectionAdminRequest, CoreAdminRequest) in the bin/solr CLI tools with generated V2 OpenAPI SolrJ classes. Also adds a new proper SolrJ V2 endpoint for GET /cluster/nodes that was previously missing, eliminating the need for a GenericV2SolrRequest workaround.

I used Copilot for this, and here is the agent chat: https://github.com/epugh/solr/tasks/3c2f15c6-c0c7-4e39-b6b6-1cd51f8e7aa4

Migrated calls

Class	Method	Before → After
CLIUtils	safeCheckCollectionExists	CollectionAdminRequest.List → CollectionsApi.ListCollections
CreateTool	createCore	CoreAdminRequest.createCore → CoresApi.CreateCore
CreateTool	createCollection	CollectionAdminRequest.createCollection → CollectionsApi.CreateCollection
DeleteTool	deleteCollection	CollectionAdminRequest.deleteCollection → CollectionsApi.DeleteCollection
DeleteTool	deleteCore	CoreAdminRequest.Unload → CoresApi.UnloadCore
StatusTool	getCloudStatus	CollectionAdminRequest.ClusterStatus → ClusterApi.ListClusterNodes + CollectionsApi.ListCollections

Verbose output restored via Jackson

The old V1 code serialized NamedList responses with noggit's JSONWriter. V2 response POJOs are Jackson-annotated, so verbose output now uses JacksonContentWriter.DEFAULT_MAPPER.writerWithDefaultPrettyPrinter() — actually cleaner output since the responses are already proper JSON objects:

// CreateTool, DeleteTool — after req.process():
if (isVerbose() && response != null) {
  echo(JacksonContentWriter.DEFAULT_MAPPER
      .writerWithDefaultPrettyPrinter()
      .writeValueAsString(response));
}

New GET /cluster/nodes V2 API (SolrJ support)

StatusTool previously fell back to GenericV2SolrRequest because SolrJ had no typed class for this endpoint. The full API pipeline was wired up:

• ListClusterNodesResponse — new model with Set<String> nodes
• ListClusterNodesApi — new endpoint interface at @Path("/cluster/nodes")
• ListClusterNodes — new Jersey implementation registered in CollectionsHandler
• ClusterApi.ListClusterNodes — generated SolrJ request class (replaces GenericV2SolrRequest)

// Before
NamedList<Object> resp = solrClient.request(
    new GenericV2SolrRequest(SolrRequest.METHOD.GET, "/cluster/nodes", SolrRequestType.ADMIN));
var liveNodes = (Collection<?>) resp.get("nodes");

// After
var resp = new ClusterApi.ListClusterNodes().process(solrClient);
var liveNodes = resp.nodes; // Set<String>

Not migrated

Snapshot tools (SnapshotCreateTool, SnapshotDeleteTool, etc.) are intentionally excluded as candidates for removal.

In fact, we may just remove them...?

Tests

Existing tests + bats tests all pass.