The build order is wrong. The docs gets build after the distribution:
mvn validate -Pdocbook,dist,perf
[INFO] Reactor Build Order: [INFO] [INFO] Hibernate Search Aggregator [INFO] Hibernate Search Build Configuration [INFO] Hibernate Search Engine [INFO] Hibernate Search ORM [INFO] Hibernate Search [Deprecated Module] [INFO] Hibernate Search Java Default Serialization [INFO] Hibernate Search Avro Serialization [INFO] Hibernate Search JGroups Backend [INFO] Hibernate Search JMS Backend [INFO] Hibernate Search Testing [INFO] Hibernate Search Infinispan Directory Provider [INFO] Hibernate Search Wildfly Module [INFO] Hibernate Search JMS Integration Tests [INFO] Hibernate Search Narayana Integration Tests [INFO] Hibernate Search Spring Integration Tests [INFO] Hibernate Search Wildfly Integration Tests [INFO] Hibernate Search Performance Tests [INFO] Hibernate Search Karaf Features Definition [INFO] Hibernate Search Sandbox Performance Tests [INFO] Hibernate Search Distribution [INFO] Hibernate Search Manual [INFO] Hibernate Search OSGi Karaf Integration Tests
We might need to add an explicit dependency from the distribution module