Switch back to ConcurrentMergeScheduler #5818
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Load tests showed that SerialMS has problems to keep up with the merges under high load. We should switch back to CMS until we have a better story to balance merge threads / efforts across shards on a single node. Closes elastic#5817
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Load tests showed that SerialMS has problems to keep up with
the merges under high load. We should switch back to CMS
until we have a better story to balance merge
threads / efforts across shards on a single node.
Closes #5817