The solution is by clicking "Roll" on "Action" of each bucket? Is it the best way to fix? It's seen on Master Node under the Fixup Buckets Pending menu.
Maybe, Please check this one - https://answers.splunk.com/answers/217020/why-is-cluster-master-reporting-cannot-fix-search.html
Please check command line tools fsck - http://docs.splunk.com/Documentation/Splunk/latest/Troubleshooting/CommandlinetoolsforusewithSupport...
