Example of bulk-vault-conversion-descriptor.txt file contains target/test-classes in path.

Migration Guide [1]
7.2.1. Migrate Vaults to Secure Credential Storage
Example: bulk-vault-conversion-descriptor.txt File

There are paths which contain "target/test-classes/" e.g.:
keystore:target/test-classes/vault-v1/vault-jceks.keystore
Please update it to
keystore:vault-v1/vault-jceks.keystore

And do same for others occurrences

[1] https://access.qa.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.1.beta/html-single/migration_guide/#migrating_to_elytron