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## Problem With upload queue reordering in #10218, we can easily get into a situation where multiple index uploads are queued back to back, which can't be parallelized. This will happen e.g. when multiple layer flushes enqueue layer/index/layer/index/... and the layers skip the queue and are uploaded in parallel. These index uploads will incur serial S3 roundtrip latencies, and may block later operations. Touches #10096. ## Summary of changes When multiple back-to-back index uploads are ready to upload, only upload the most recent index and drop the rest.