Our Confluence Data Center Documentation can be improved in several ways, as some parts are not very clear.

For example, checking our documentation regarding Cluster Troubleshooting that we recommend our customers to read we have the following statement:

Overriding Hazelcast Configuration

If the solution to your problem involves changes to the Hazelcast configuration, these changes should not be made to the Confluence configuration files. Instead, to ensure your configuration survives upgrades, make your changes by creating a Hazelcast override file.

We don't mention anything else regarding this file, not even where is located. In this case, to make this change, it is necessary to extract the file hazelcast-3.4.2-atlassian-14.jar located at /confluence/WEB-INF/lib/ to find the hazelcast-default.xml, which contain the configurations for the Hazelcast implementation.