The following document says that default value of org.kie.executor.interval is 3.

Table 19.4. Bootstrap Switches for Executor Properties
https://access.redhat.com/documentation/en-us/red_hat_process_automation_manager/7.0/html/managing_and_monitoring_the_process_server/kie-server-bootstrap-switches-ref

But the following are logged in server.log.

2018-09-13 19:17:11,725 INFO [org.jbpm.executor.impl.ExecutorImpl] (ServerService Thread Pool – 179) Starting jBPM Executor Component ...

• Thread Pool Size: 1
• Retries per Request: 3
• Load from storage interval: 0 SECONDS (if less or equal 0 only initial sync with storage) <= HERE

In fact, default is 0 in the following source code.

https://github.com/kiegroup/jbpm/blob/7.7.x/jbpm-services/jbpm-executor/src/main/java/org/jbpm/executor/impl/ExecutorImpl.java#L100