path.repo 配置了多个路径后 仓库切换出现错误

单设备两个数据节点，配置的备份仓库是：path.repo: ["/mnt/arkbase_backups", "/home/arkbase_backups"] 后，业务需求是均衡的备份到两块磁盘，备份切换的时候出现了错误：

[2021-10-20T18:56:54,182][WARN ][o.e.s.SnapshotsService   ] [7G-mTZm] [eventback:event20211013_v0/OUUvsQnqSpe5JsbyoztGvA] failed to finalize snapshot

org.elasticsearch.repositories.RepositoryException: [eventback] concurrent modification of the index-N file, expected current generation [4], actual current generation [59] - possibly due to simultaneous snapshot deletion requests

        at org.elasticsearch.repositories.blobstore.BlobStoreRepository.writeIndexGen(BlobStoreRepository.java:714) ~[elasticsearch-6.8.16.jar:6.8.16]

        at org.elasticsearch.repositories.blobstore.BlobStoreRepository.finalizeSnapshot(BlobStoreRepository.java:540) ~[elasticsearch-6.8.16.jar:6.8.16]

        at org.elasticsearch.snapshots.SnapshotsService$5.doRun(SnapshotsService.java:990) [elasticsearch-6.8.16.jar:6.8.16]

        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:778) [elasticsearch-6.8.16.jar:6.8.16]

        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-6.8.16.jar:6.8.16]

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_232]

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_232]

        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_232]

q请教下 对于 多块磁盘 ES备份归档索引到两块磁盘上，使磁盘均衡操作的解决方案是啥？以及再进行仓库切换的时候出现的错误的原因？以及解决方案？ 在这先多谢了