i have the similar issue.i couldn't find any document or solution for this..if someone had this issue and resolved please let us know the process to fix this issue.
Below are the warnings in the licencing page
In the Splunk > System > Licencing
1 pool warning reported by 1 indexer - correct by midnight to avoid violation
1 pool quota overage warning reported - correct by midnight to avoid violation
Under the Pools Table
auto_generated_pool_enterprise 17 MB / 0 MB
... View more