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b9358ccca8
This adds a new boolean (index.merge.scheduler.auto_throttle) dynamic setting, default true (matching Lucene), to adaptively set the IO rate limit for merges over time. This is more flexible than the previous fixed rate throttling because it responds depending on the incoming merge rate, so search-heavy applications that are not doing much indexing will see merges heavily throttled while indexing-heavy cases will lighten the throttle so merges can keep up within incoming indexing. The fixed rate throttling is still available as a fallback if things go horribly wrong. Closes #9243 Closes #9133