During investigation of unrelated issue, it was not clear which version of Maven is used by CI. Ensuring that the same version is used for local development and CI would reduce variations and help pinpoint issues. Maven Wrapper is installed for all search platform projects and takes care of downloading the correct maven version. It would be nice to use it for CI as well.
Concretely, this means using the mvnw wrapper script that is available in the root of each project repository instead of the mvn command installed on the CI host.