Indexing were stopped and there exist unindexed.log file under the data folder

Hi all,
I have elasticsearch environment which contained four nodes and each one
was configured eight shards and no replica.
The issue is when I indexing approximately 500 MB file, the cluster was
interrupted, and I found the shard size was just 16 MB.
There was unindexed.log file under the data folder and the state of shard 0
was unsigned.

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