snapshot partial error

[ihocho]

Hi.

I got this error when i back a indices up using curator
2017-02-07 08:50:56,128 ERROR Snapshot PARTIAL completed with state: PARTIAL

The command i executed is like this.
curator --host xxxx --port xxxx snapshot --repository s3_snapshot_backup --skip-repo-validation indices --older-than 1 --time-unit days --timestring '%Y.%m.%d' --prefix logstash

I have no idea how to resolve that.
I need your help.

Thanks in advance.