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[Profiling] Query in parallel on content nodes
In order to take advantage of inherent parallelism of modern SSDs, we slice keys and issue multiple mgets concurrently. In elastic#103061 we have introduced an additional heuristic to disable that behavior on the warm and cold tier which usually use spinning disks. We have unintentionally also disabled the behavior on content nodes, i.e. on any clusters which do not use data tiers. With this commit we explicitly exclude content nodes from the heuristic so they can benefit from speedups due to concurrent mgets. Relates elastic#103061
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