SOLR-16390: Move cluster command-status APIs to /cluster/commands

[iprithv]

Renames the v2 cluster async-command APIs to be more REST-ful, and converts them from the homegrown @EndPoint wrappers to JAX-RS.

[epugh]

I am reviewing aginst https://raw.githubusercontent.com/epugh/solr/87c474e487543fe3d74fc5a29ac9c3db0ef0e2ff/dev-docs/v2-api-conventions.adoc

[epugh]

LGTM. Having said that, I made one code change to make state an enumeration not a string, and so hoping @iprithv verifies it!

[epugh]

this api is purely client side, and there are no changes to the V1 approach. This should be pretty low risk.

[Copilot]

🟢 Approval recommended

The new JAX-RS APIs, v1 delegation, documentation updates, and added SolrCloud tests appear consistent and complete for the endpoint rename.

Pull request overview

This PR renames the v2 cluster-level async command status APIs from the legacy /api/cluster/command-status shape to a more REST-friendly /api/cluster/commands resource, and migrates the implementation from @EndPoint mappings to JAX-RS (while keeping v1 REQUESTSTATUS/DELETESTATUS behavior working via delegation).

Changes:

• Introduces new JAX-RS endpoint definitions and response models for GET/DELETE /api/cluster/commands/{requestId} and DELETE /api/cluster/commands.
• Refactors v1 REQUESTSTATUS / DELETESTATUS operations to delegate to the new JAX-RS implementation for consistent behavior.
• Updates ref-guide + developer docs, adds new SolrCloud HTTP tests for the new endpoints, and removes now-obsolete v2-to-v1 mapping tests for the old path.

File summaries

File	Description
solr/solr-ref-guide/modules/configuration-guide/pages/collections-api.adoc	Updates ref-guide examples to use /api/cluster/commands and clarifies flush is v1-only.
solr/core/src/test/org/apache/solr/handler/V2ClusterAPIMappingTest.java	Removes mapping tests for the retired /cluster/command-status @EndPoint routes.
solr/core/src/test/org/apache/solr/handler/admin/api/ClusterCommandsTest.java	Adds SolrCloud HTTP coverage for GET/DELETE cluster command status via SolrJ request classes.
solr/core/src/java/org/apache/solr/handler/ClusterAPI.java	Removes the old @EndPoint handlers for /cluster/command-status.
solr/core/src/java/org/apache/solr/handler/admin/CollectionsHandler.java	Routes v1 REQUESTSTATUS/DELETESTATUS handling through the new ClusterCommands implementation and registers the Jersey resource.
solr/core/src/java/org/apache/solr/handler/admin/api/ClusterCommands.java	New Jersey resource implementing the cluster command-status functionality plus v1 bridging helpers.
solr/api/src/java/org/apache/solr/client/api/model/GetClusterCommandStatusResponse.java	Adds typed response model for GET /api/cluster/commands/{requestId} with support for flattened async sub-responses.
solr/api/src/java/org/apache/solr/client/api/model/DeleteClusterCommandStatusResponse.java	Adds response model for delete operations on stored async statuses.
solr/api/src/java/org/apache/solr/client/api/endpoint/GetNodeCommandStatusApi.java	Updates docs to reference the new cluster async status path.
solr/api/src/java/org/apache/solr/client/api/endpoint/ClusterCommandsApi.java	New v2 API contract for /cluster/commands operations (GET/DELETE single + DELETE all).
dev-docs/v2-api-conventions.adoc	Adds /api/cluster/commands examples to the v2 REST path conventions list.
changelog/unreleased/SOLR-16390-cluster-command-status.yml	Adds changelog entry documenting the API rename and the new SolrJ request helpers.

Review details

• Files reviewed: 12/12 changed files
• Comments generated: 0
• Review effort level: Lite

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[iprithv]

LGTM. Having said that, I made one code change to make state an enumeration not a string, and so hoping @iprithv verifies it!

Thanks for the review, and for the enum change. I looked it over and it looks good.