public Optional<Output<String>> operation() {
        return Optional.ofNullable(this.operation);
    }
@return Operation is the type of operation which lead to this ManagedFieldsEntry being created. The only valid values for this field are &#39;Apply&#39; and &#39;Update&#39;.
sdk/java/src/main/java/com/pulumi/kubernetes/meta/v1/inputs/ManagedFieldsEntryPatchArgs.java