Add missing import
Relates elastic/x-pack-elasticsearch#3271
Original commit: elastic/x-pack-elasticsearch@c6b74d5e00eabb16203cf8302e61b41b70cec7b0
@@ -11,6 +11,7 @@ import org.apache.lucene.util.IOUtils;
import org.elasticsearch.cli.Command;
import org.elasticsearch.cli.CommandTestCase;
import org.elasticsearch.cli.ExitCodes;
+import org.elasticsearch.cli.Terminal;
import org.elasticsearch.cli.UserException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.PathUtilsForTesting;
