https://access.redhat.com/webassets/avalon/d/red_hat_jboss_enterprise_application_platform/8.1/javadocs/org/infinispan/client/hotrod/counter/operation/IsDefinedOperation.html
IsDefinedOperation (Red Hat JBoss Enterprise Application Platform 8.1.1.GA + JBoss EAP XP 6.0.0.GA...
declaration: package: org.infinispan.client.hotrod.counter.operation, class: IsDefinedOperation