[8.x] Resolve/cluster allows querying for cluster info only (no index expression required) (#119898) #120650
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…ssion required) (elastic#119898) Resolve/cluster allows querying for cluster-info-only (no index expression required) This enhancement provides users with the ability to query the _resolve/cluster API endpoint without specifying an index expression to match against. This allows users to quickly test what remote clusters are configured on a cluster and whether they are available for querying. The new endpoint takes no index expression: ``` GET _resolve/cluster ``` and returns the same information as before except for the "matching_indices" field. Example response: ``` { "remote1": { "connected": false, "skip_unavailable": true }, "remote2": { "connected": true, "skip_unavailable": false, "version": { "number": "8.17.0", "build_flavor": "default", "minimum_wire_compatibility_version": "7.17.0", "minimum_index_compatibility_version": "7.0.0" } } } ``` For backwards compatibility, this new endpoint works with clusters from older versions by querying with the index expression `dummy*` on those older clusters and ignoring the matching_indices value in the response they return.
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Backports the following commits to 8.x: