I am seeing a lot of "ProcessTracker - (child_56__Fsck) Fsck - Rebuild --bloom-only bucket /apps/splunk/splunk/var/lib/splunk/summary_indexers/db" messages in my splunkd.log. Is this indicating a problem?
No. Splunk runs fsck pretty much continuously in the background as maintenance. It is set in indexes.conf. Search for fsck in this doc: