At the moment, Kuery does not support wildcards, so there's no way to do a "contains" like that, only exact matches.
It's apparently a known limitation, but there's not any plans right now to work on adding it, but that's not to say it won't get added. I'd encourage you to open an issue asking for that functionality, so that it can be tracked and discussed.
Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant
logo are trademarks of the
Apache Software Foundation
in the United States and/or other countries.