[9.0] Remove search throttled index setting and thread pool #124874
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Frozen indices, the freeze index API and the private index.frozen setting have been removed with elastic#120539. There is also a search throttled thread pool that can now be removed, as well as a private search.throttled index settings that is no longer used as it could only be set internally by freezing an index. While the index setting is private and can be removed, as it should no longer be present in any index on 9.0+ indices, the thread pool settings associated to the removed pool are still accepted as no-op in case users have customized them and are upgrading without removing these. These will also trigger a deprecating warning. This change also removes the search.throttled related output from the thread pool section of the cluster info API.
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Frozen indices, the freeze index API and the private index.frozen setting have been removed with #120539.
There is also a search throttled thread pool that can now be removed, as well as a private search.throttled index settings that is no longer used as it could only be set internally by freezing an index.
While the index setting is private and can be removed, as it should no longer be present in any index on 9.0+ indices, the thread pool settings associated to the removed pool are still accepted as no-op in case users have customized them and are upgrading without removing these. These will also trigger a deprecating warning.
This change also removes the search.throttled related output from the thread pool section of the cluster info API.