Splunk btool checks spec file in etc/apps/_app_name_/README directory . If those attributes are not listed, when starting Splunk, btool check will generated warning message. I just took a look at the latest version of viz_clustermap app. It contains savedseaerches.conf.spec file.
Can you double-check;
1. Splunk version is 6.4
2. viz_clustermap app is the latest version
If both are correct, please contact the author of app first, then, if that's not app specific, please file a Splunk Support case.
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