We have a way to merges indexes together with IW.addIndexes, however not the opposite, split up an index with multiple segments. I think I can simply manufacture a new segmentinfos in a new directory, copy over the segments files from those segments, delete the copied segments from the source, and save the old segmentinfos less the copied segments. It seems like a useful tool? The use case is I've reached a limit on EC2 and the index has slowed to a crawl, so rather than reindex 80GB in two different places, this approach would be more efficient.
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